EXHIBIT 99.1

                          BA MORTGAGE SECURITIES, INC.
                       Mortgage Pass-Through Certificates
                                  Series 1998-1
                         Statement To Certificateholders

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                                                             DISTRIBUTIONS IN DOLLARS
                                           PRIOR                                                                           CURRENT
                       ORIGINAL        PRINCIPAL                                               REALIZED  DEFERRED        PRINCIPAL
     CLASS           FACE VALUE          BALANCE       INTEREST      PRINCIPAL          TOTAL    LOSSES  INTEREST          BALANCE
------------------------------------------------------------------------------------------------------------------------------------

<S>              <C>              <C>              <C>            <C>            <C>               <C>       <C>    <C>
     P1-M             21,501.00        21,125.64           0.00          20.57          20.57      0.00      0.00        21,105.08
     P2-M            350,133.00       325,314.03           0.00       1,377.49       1,377.49      0.00      0.00       323,936.54
     X1-M *      142,084,361.67    93,940,838.70      40,744.00           0.00      40,744.00      0.00      0.00    93,835,252.08
     X2-M *      187,559,494.52   126,057,600.48      22,976.92           0.00      22,976.92      0.00      0.00   124,404,091.04
     Y1               71,698.81        47,382.63         266.53           0.00         266.53      0.00      0.00        47,382.63
     Y2               99,676.65        62,606.19         339.12         186.38         525.50      0.00      0.00        62,419.81
     Z1          143,556,266.44    95,406,556.96     536,661.88     107,058.71     643,720.59      0.00      0.00    95,299,498.25
     Z2          199,253,620.42   136,943,056.39     741,774.89   1,699,877.50   2,441,652.39      0.00      0.00   135,243,178.89
     R-I                  50.00             0.00           0.00           0.00           0.00      0.00      0.00             0.00


------------------------------------------------------------------------------------------------------------------------------------
TOTALS           343,352,946.32   232,806,041.84   1,342,763.34   1,808,520.65   3,151,283.99      0.00      0.00   230,997,521.20
------------------------------------------------------------------------------------------------------------------------------------
*Notional Class Balance
</TABLE>


<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                                      FACTOR INFORMATION PER $1000 OF ORIGINAL FACE                                PASS-THROUGH
                                                 PRIOR                                            CURRENT              RATES
                                             PRINCIPAL                                          PRINCIPAL
      CLASS                   CUSIP            BALANCE    INTEREST   PRINCIPAL        TOTAL       BALANCE      CURRENT          NEXT
------------------------------------------------------------------------------------------------------------------------------------
<S>                        <C>                 <C>           <C>         <C>          <C>         <C>           <C>        <C>
     P1-M                                      982.542       0.000       0.956        0.956       981.585       0.0000     0.000000%
     P2-M                                      929.115       0.000       3.934        3.934       925.181       0.0000     0.000000%
     X1-M *                                    661.162       0.286       0.000        0.286       660.419       0.5204     0.520464%
     X2-M *                                    672.093       0.122       0.000        0.122       663.278       0.2187     0.218728%
     Y1                                        660.856       3.717       0.000        3.717       660.856       6.7500     6.750000%
     Y2                                        628.092       3.402       1.869        5.272       626.223       6.5000     6.500000%
     Z1                                        664.593       3.738       0.745        4.484       663.847       6.7500     6.750000%
     Z2                                        687.280       3.722       8.531       12.253       678.748       6.5000     6.500000%
     R-I                   055240DQ5             0.000       0.000       0.000        0.000         0.000       6.7500     6.750000%


------------------------------------------------------------------------------------------------------------------------------------
SELLER:                                               Bank of America                   ADMINISTRATOR:          Kelly L. Shea
SERVICER:                                             Bank of America                                           Deutsche Bank
LEAD UNDERWRITER:                              Donaldson, Lufkin & Jenrette                                 1761 E. St. Andrew Place
RECORD DATE:                                         November 30, 1999                                        Santa Ana, CA 92705
DISTRIBUTION DATE:                                   December 27, 1999                FACTOR INFORMATION:      (800) 735-7777
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                                   Page 1 of 5  [C] COPYRIGHT 1999 Deutsche Bank


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       Mortgage Pass-Through Certificates
                                  Series 1998-1

                         Statement To Certificateholders
<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                                                       DISTRIBUTIONS IN DOLLARS
                                           PRIOR                                                                            CURRENT
                       ORIGINAL        PRINCIPAL                                               REALIZED  DEFERRED         PRINCIPAL
    CLASS            FACE VALUE          BALANCE       INTEREST      PRINCIPAL          TOTAL    LOSSES  INTEREST           BALANCE
------------------------------------------------------------------------------------------------------------------------------------
<S>              <C>              <C>              <C>            <C>            <C>               <C>       <C>    <C>
     IA-1         96,101,504.00    47,989,796.57     269,942.61     103,407.65     373,350.26      0.00      0.00    47,886,388.92
     IA-2          5,000,000.00     5,000,000.00      28,125.00           0.00      28,125.00      0.00      0.00     5,000,000.00
     IA-3          9,500,000.00     9,500,000.00      53,437.50           0.00      53,437.50      0.00      0.00     9,500,000.00
     IA-4         14,250,000.00    14,250,000.00      80,156.25           0.00      80,156.25      0.00      0.00    14,250,000.00
     IA-5          4,887,000.00     4,887,000.00      27,489.38           0.00      27,489.38      0.00      0.00     4,887,000.00
     IA-6          9,939,000.00     9,939,000.00      55,906.88           0.00      55,906.88      0.00      0.00     9,939,000.00
     I-X *        11,983,709.00     7,243,378.42      40,743.99           0.00      40,743.99      0.00      0.00     7,235,267.53
     I-PO             21,501.00        21,125.64           0.00          20.56          20.56      0.00      0.00        21,105.08
     IIA-1       121,111,453.00    82,382,346.39     446,237.71   1,049,524.76   1,495,762.47      0.00      0.00    81,332,821.63
     IIA-2         1,000,000.00       550,144.73       2,979.95      11,615.74      14,595.69      0.00      0.00       538,528.99
     IIA-3         8,262,000.00     8,262,000.00      44,752.50           0.00      44,752.50      0.00      0.00     8,262,000.00
     IIA-4        14,913,749.00    13,950,940.65      75,567.60      54,593.85     130,161.45      0.00      0.00    13,896,346.80
     IIA-5        46,447,250.00    26,722,867.17     144,748.86     564,225.63     708,974.49      0.00      0.00    26,158,641.54
     IIA-6         2,127,000.00             0.00           0.00           0.00           0.00      0.00      0.00             0.00
     II-X *        7,513,508.12     4,241,892.02      22,976.92           0.00      22,976.92      0.00      0.00     4,209,136.05
     II-PO           350,133.00       325,314.03           0.00       1,377.49       1,377.49      0.00      0.00       323,936.54


------------------------------------------------------------------------------------------------------------------------------------
TOTALS           333,910,590.00   223,780,535.18   1,293,065.15   1,784,765.68   3,077,830.83      0.00      0.00   221,995,769.50
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
*Notional Class Balance

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                                      FACTOR INFORMATION PER $1000 OF ORIGINAL FACE                  PASS-THROUGH
                                    PRIOR                                           CURRENT              RATES
                                PRINCIPAL                                         PRINCIPAL
    CLASS         CUSIP           BALANCE   INTEREST   PRINCIPAL       TOTAL        BALANCE     CURRENT            NEXT
------------------------------------------------------------------------------------------------------------------------------------
<S>           <C>                <C>            <C>         <C>         <C>        <C>            <C>         <C>
     IA-1     055240CT0            499.36       2.80        1.07        3.88         498.28       6.750       6.750000%
     IA-2     055240CU7          1,000.00       5.62        0.00        5.62       1,000.00       6.750       6.750000%
     IA-3     055240CV5          1,000.00       5.62        0.00        5.62       1,000.00       6.750       6.750000%
     IA-4     055240CW3          1,000.00       5.62        0.00        5.62       1,000.00       6.750       6.750000%
     IA-5     055240CX1          1,000.00       5.62        0.00        5.62       1,000.00       6.750       6.750000%
     IA-6     055240CY9          1,000.00       5.62        0.00        5.62       1,000.00       6.750       6.750000%
     I-X *    055240DF9            604.43       5.62        0.00        5.62         603.75       6.750       0.000000%
     I-PO     055240DH5            982.54       0.00        0.95        0.95         981.58       0.000       6.500000%
     IIA-1    055240CZ6            680.21       3.68        8.66       12.35         671.55       6.500       6.500000%
     IIA-2    055240DA0            550.14       2.97       11.61       14.59         538.52       6.500       6.500000%
     IIA-3    055240DB8          1,000.00       5.41        0.00        5.41       1,000.00       6.500       6.500000%
     IIA-4    055240DC6            935.44       5.06        3.66        8.72         931.78       6.500       6.500000%
     IIA-5    055240DD4            575.33       3.11       12.14       15.26         563.19       6.500       6.500000%
     IIA-6    055240DE2              0.00       0.00        0.00        0.00           0.00       6.500       6.500000%
     II-X *   055240DG7            564.56       3.05        0.00        3.05         560.20       6.500       0.000000%
     II-PO    055240DU6            929.11       0.00        3.93        3.93         925.18       0.000       0.000000%


------------------------------------------------------------------------------------------------------------------------------------
SELLER:                                               Bank of America                   ADMINISTRATOR:          Kelly L. Shea
SERVICER:                                             Bank of America                                           Deutsche Bank
LEAD UNDERWRITER:                              Donaldson, Lufkin & Jenrette                                 1761 E. St. Andrew Place
RECORD DATE:                                         November 30, 1999                                        Santa Ana, CA 92705
DISTRIBUTION DATE:                                   December 27, 1999                FACTOR INFORMATION:      (800) 735-7777
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                                   Page 2 of 5  [C] COPYRIGHT 1999 Deutsche Bank


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       Mortgage Pass-Through Certificates
                                  Series 1998-1

                         Statement To Certificateholders

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                                                       DISTRIBUTIONS IN DOLLARS
                                     PRIOR                                                                 CURRENT
                   ORIGINAL      PRINCIPAL                                      REALIZED  DEFERRED       PRINCIPAL
    CLASS        FACE VALUE        BALANCE    INTEREST   PRINCIPAL       TOTAL    LOSSES  INTEREST         BALANCE
------------------------------------------------------------------------------------------------------------------------------------
<S>            <C>            <C>            <C>          <C>        <C>            <C>       <C>    <C>
     M         3,776,882.00   3,610,202.19   19,879.27    9,501.99   29,381.26      0.00      0.00   3,600,700.20
     B-1       2,231,794.00   2,133,301.36   11,746.84    5,614.81   17,361.65      0.00      0.00   2,127,686.55
     B-2       1,201,735.00   1,148,700.53    6,325.22    3,023.36    9,348.58      0.00      0.00   1,145,677.17
     B-3       1,030,060.00     984,601.79    5,421.63    2,591.45    8,013.08      0.00      0.00     982,010.34
     B-4         515,029.00     492,299.93    2,710.81    1,295.72    4,006.53      0.00      0.00     491,004.21
     B-5         686,706.32     656,400.86    3,614.42    1,727.63    5,342.05      0.00      0.00     654,673.23
     R-II             50.00           0.00        0.00        0.00        0.00      0.00      0.00           0.00
------------------------------------------------------------------------------------------------------------------------------------
TOTALS         9,442,256.32   9,025,506.66   49,698.19   23,754.96   73,453.15      0.00      0.00   9,001,751.70
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
*Notional Class Balance

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                                      FACTOR INFORMATION PER $1000 OF ORIGINAL FACE          PASS-THROUGH
                                PRIOR                                       CURRENT              RATES
                            PRINCIPAL                                     PRINCIPAL
   CLASS        CUSIP         BALANCE   INTEREST  PRINCIPAL      TOTAL      BALANCE     CURRENT            NEXT
------------------------------------------------------------------------------------------------------------------------------------
<S>         <C>                <C>          <C>        <C>        <C>        <C>          <C>         <C>
     M      055240DJ1          955.86       5.26       2.51       7.77       953.35       6.607       6.607882%
     B-1    055240DK8          955.86       5.26       2.51       7.77       953.35       6.607       6.607882%
     B-2    055240DL6          955.86       5.26       2.51       7.77       953.35       6.607       6.607882%
     B-3    055240DM4          955.86       5.26       2.51       7.77       953.35       6.607       6.607882%
     B-4    055240DN2          955.86       5.26       2.51       7.77       953.35       6.607       6.607882%
     B-5    055240DP7          955.86       5.26       2.51       7.77       953.35       6.607       6.607882%
     R-II   055240DR3            0.00       0.00       0.00       0.00         0.00       6.750       6.750000%


------------------------------------------------------------------------------------------------------------------------------------
SELLER:                                               Bank of America                   ADMINISTRATOR:          Kelly L. Shea
SERVICER:                                             Bank of America                                           Deutsche Bank
LEAD UNDERWRITER:                              Donaldson, Lufkin & Jenrette                                 1761 E. St. Andrew Place
RECORD DATE:                                         November 30, 1999                                        Santa Ana, CA 92705
DISTRIBUTION DATE:                                   December 27, 1999                FACTOR INFORMATION:      (800) 735-7777
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                                   Page 3 of 5  [C] COPYRIGHT 1999 Deutsche Bank


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       Mortgage Pass-Through Certificates
                                  Series 1998-1

                         Statement To Certificateholders

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
Distribution Date:                  December 27, 1999
------------------------------------------------------------------------------------------------------------------------------------
MORTGAGE POOL INFORMATION:                                                          GROUP I                           GROUP II
--------------------------                                                          -------                           --------

<S>                                                                                <C>                              <C>
                   BEGINNING BALANCE OF POOL                                       95,475,065.27                    137,330,976.86
                   LESS:            SCHEDULED PRINCIPAL                               (89,654.07)                      (537,439.31)
                                    PRINCIPAL PREPAYMENTS                             (17,425.20)                    (1,164,002.07)
                                    REPURCHASES                                             0.00                              0.00
                                    LIQUIDATIONS                                            0.00                              0.00
                                    OTHER UNSCHEDULED PRINCIPAL                             0.00                              0.00
                                                                                ----------------                 -----------------
                   ENDING BALANCE OF POOL                                          95,367,986.00                    135,629,535.48
                                                                                ================                 =================

                   BEGINNING NUMBER OF LOANS IN POOL                                         301                               424
                   ENDING NUMBER OF LOANS IN POOL                                            301                               422

                   WEIGHTED AVERAGE REMAINING TERM TO MATURITY                               329                               155
                   WEIGHTED AVERAGE NET CONTRACT RATE                                  7.510607%                         7.071878%

                   CURRENT REALIZED LOSSES ON THE POOL                                      0.00                              0.00
                   CUMULATIVE REALIZED LOSSES ON THE POOL                                   0.00                              0.00

                   BEGINNING POOL BALANCE OF PREMIUM LOANS                         93,940,838.70                    126,057,600.48
                   STRIPPED INTEREST RATE                                              0.520464%                         0.218728%
</TABLE>


<TABLE>
<CAPTION>

------------------------------------------------------------------------------------------------------------------------------------
DELINQUENT, BANKRUPTCY,                                                             LOANS           LOANS           LOANS
FORECLOSURE, AND REO                      30 TO 59       60 TO 89       90 PLUS      IN              IN              IN
LOAN INFORMATION                            DAYS           DAYS           DAYS    BANKRUPTCY     FORECLOSURE         REO
------------------------------------------------------------------------------------------------------------------------------------

<S>                                           <C>           <C>           <C>          <C>           <C>            <C>
GROUP I    PRINCIPAL BALANCE                     0.00          0.00          0.00         0.00          0.00           0.00
                PERCENTAGE OF GROUP BAL.      0.0000%       0.0000%       0.0000%      0.0000%       0.0000%        0.0000%
           NUMBER OF LOANS                          0             0             0            0             0              0
                PERCENTAGE OF LOANS           0.0000%       0.0000%       0.0000%      0.0000%       0.0000%        0.0000%
GROUP II   PRINCIPAL BALANCE                     0.00          0.00          0.00         0.00          0.00           0.00
                PERCENTAGE OF GROUP BAL.      0.0000%       0.0000%       0.0000%      0.0000%       0.0000%        0.0000%
           NUMBER OF LOANS                          0             0             0            0             0              0
                PERCENTAGE OF LOANS           0.0000%       0.0000%       0.0000%      0.0000%       0.0000%        0.0000%
------------------------------------------------------------------------------------------------------------------------------------
           GROUP I BOOK VALUE OF REO PROPERTIES                                                          NA
           GROUP II BOOK VALUE OF REO PROPERTIES                                                         NA
</TABLE>

<TABLE>
<CAPTION>
SERVICING INFORMATION:                                                              GROUP I                           GROUP II
<S>                                                                                    <C>                               <C>
                   SERVICING FEES ACCRUED DURING THE CURRENT DUE PERIOD                19,890.64                         44,232.35
                   PLUS:            ADDITIONAL SERVICING COMPENSATION                       0.00                              0.00
                   LESS:            AMTS. TO COVER PREPAYMENT INT. SHORTFALL                0.00                         (5,111.31)
                                    DELINQUENT SERVICING FEES                          (1,168.00)                         1,949.20
                   SERVICING FEES COLLECTED FOR THE CURRENT DUE PERIOD                 18,722.64                         41,070.24

                   ADVANCED PRINCIPAL                                                   4,960.81                         22,375.43
                   ADVANCED INTEREST                                                   33,642.47                         33,421.46
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                                   Page 4 of 5   [C]COPYRIGHT 1999 Deutsche Bank


<PAGE>



                          BA MORTGAGE SECURITIES, INC.
                       Mortgage Pass-Through Certificates
                                  Series 1998-1

                         Statement To Certificateholders
<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
Distribution Date:                  December 27, 1999
------------------------------------------------------------------------------------------------------------------------------------
                                                    OTHER                           CUMULATIVE
                                 PREPAYMENT      UNSCHEDULED       CERTIFICATE         UNPAID               CUMULATIVE
                                 PRINCIPAL        PRINCIPAL          INTEREST         INTEREST               REALIZED
    CLASS                       DISTRIBUTED      DISTRIBUTED        SHORTFALL        SHORTFALL                LOSSES
------------------------------------------------------------------------------------------------------------------------------------
<S>                                 <C>                   <C>               <C>              <C>                     <C>
 CLASS IA-1                          17,421.74             0.00              0.00             0.00                    0.00
 CLASS IA-2                               0.00             0.00              0.00             0.00                    0.00
 CLASS IA-3                               0.00             0.00              0.00             0.00                    0.00
 CLASS IA-4                               0.00             0.00              0.00             0.00                    0.00
 CLASS IA-5                               0.00             0.00              0.00             0.00                    0.00
 CLASS IA-6                               0.00             0.00              0.00             0.00                    0.00
 CLASS I-X                                0.00             0.00              0.00             0.00                    0.00
 CLASS I-PO                               3.46             0.00              0.00             0.00                    0.00
 CLASS IIA-1                        726,593.57             0.00              0.00             0.00                    0.00
 CLASS IIA-2                          8,041.66             0.00              0.00             0.00                    0.00
 CLASS IIA-3                              0.00             0.00              0.00             0.00                    0.00
 CLASS IIA-4                         37,795.71             0.00              0.00             0.00                    0.00
 CLASS IIA-5                        390,617.48             0.00              0.00             0.00                    0.00
 CLASS IIA-6                              0.00             0.00              0.00             0.00                    0.00
 CLASS II-X                               0.00             0.00              0.00             0.00                    0.00
 CLASS II-PO                            953.65             0.00              0.00             0.00                    0.00
 CLASS M                                  0.00             0.00              0.00             0.00                    0.00
 CLASS B-1                                0.00             0.00              0.00             0.00                    0.00
 CLASS B-2                                0.00             0.00              0.00             0.00                    0.00
 CLASS B-3                                0.00             0.00              0.00             0.00                    0.00
 CLASS B-4                                0.00             0.00              0.00             0.00                    0.00
 CLASS B-5                                0.00             0.00              0.00             0.00                    0.00
------------------------------------------------------------------------------------------------------------------------------------
TOTALS                            1,181,427.27             0.00                       0.00             0.00                    0.00
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>


<TABLE>
<CAPTION>

<S>                                                                                                                <C>
                   OTHER REPORTING ITEMS:

                   GROUP I PERCENTAGE                                                                                    95.93%
                   GROUP I PREPAYMENT PERCENTAGE                                                                        100.00%
                   GROUP II PERCENTAGE                                                                                   96.25%
                   GROUP II PREPAYMENT PERCENTAGE                                                                       100.00%

                   SUBORDINATE PRINCIPAL DISTRIBUTION AMOUNT                                                          23,754.97
                   HAS THE CREDIT SUPPORT DEPLETION DATE OCCURRED                                                            No

                   BANKRUPTCY AMOUNT                                                                                 100,000.00
                   FRAUD LOSS AMOUNT                                                                                 119,926.36
                   SPECIAL HAZARD AMOUNT                                                                           4,500,664.47
                   EXTRAORDINARY LOSSES FOR THE PRIOR PERIOD                                                               0.00

                   GROUP I EXTRAORDINARY LOSSES                                                                            0.00
                   GROUP II EXTRAORDINARY LOSSES                                                                           0.00
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                                   Page 5 of 5  [C] COPYRIGHT 1999 Deutsche Bank


<PAGE>

                          BA MORTGAGE SECURITIES, INC.
                       Mortgage Pass-Through Certificates
                                  Series 1998-1
                                     REMIC I
                         Statement To Certificateholders


<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                                                     DISTRIBUTIONS IN DOLLARS
                                      PRIOR                                                                                 CURRENT
                   ORIGINAL       PRINCIPAL                                                 REALIZED       DEFERRED       PRINCIPAL
    CLASS        FACE VALUE         BALANCE      INTEREST     PRINCIPAL          TOTAL        LOSSES       INTEREST         BALANCE
<S>          <C>             <C>             <C>           <C>            <C>                   <C>            <C>   <C>
     P1-M         21,501.00       21,326.66          0.00         19.70          19.70          0.00           0.00       21,306.96
     P2-M        350,133.00      338,956.01          0.00      1,276.60       1,276.60          0.00           0.00      337,679.41
     X1-M *  142,084,361.67  114,250,923.50     51,241.56          0.00      51,241.56          0.00           0.00  111,731,641.75
     X2-M *  187,559,494.52  154,169,846.68     30,396.10          0.00      30,396.10          0.00           0.00  150,841,825.64
     Y1           71,698.81       54,430.78        306.18          0.00         306.18          0.00           0.00       54,430.78
     Y2           99,676.65       73,970.01        400.67        197.73         598.40          0.00           0.00       73,772.28
     Z1      143,556,266.44  115,724,996.19    650,953.10  2,520,851.95   3,171,805.05          0.00           0.00  113,204,144.24
     Z2      199,253,620.42  165,512,214.69    896,524.50  3,371,342.31   4,267,866.81          0.00           0.00  162,140,872.38
     R-I              50.00            0.00          0.00          0.00           0.00          0.00           0.00            0.00

------------------------------------------------------------------------------------------------------------------------------------
TOTALS       343,352,946.32  281,725,894.34  1,629,822.11  5,893,688.29   7,523,510.40          0.00           0.00  275,832,206.05
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
  *Notional  Class Balance

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                            FACTOR INFORMATION PER $1000 OF ORIGINAL FACE                                     PASS-THROUGH
                                       PRIOR                                                  CURRENT            RATES
                                   PRINCIPAL                                                PRINCIPAL
     CLASS          CUSIP            BALANCE      INTEREST     PRINCIPAL          TOTAL       BALANCE       CURRENT           NEXT
------------------------------------------------------------------------------------------------------------------------------------
<S>                               <C>             <C>           <C>            <C>         <C>            <C>            <C>
          P1-M                    991.891540      0.000000      0.916236       0.916236    990.975303     0.000000%      0.000000%
          P2-M                    968.077873      0.000000      3.646043       3.646043    964.431830     0.000000%      0.000000%
          X1-M *                  804.106252      0.360642      0.000000       0.360642    786.375365     0.538200%      0.538200%
          X2-M *                  821.978365      0.162061      0.000000       0.162061    804.234550     0.236592%      0.236592%
          Y1                      759.158738      4.270322      0.000000       4.270322    759.158738     6.750000%      6.750000%
          Y2                      742.099690      4.019698      1.983675       6.003372    740.115976     6.500000%      6.500000%
          Z1                      806.129882      4.534481     17.560027      22.094508    788.569855     6.750000%      6.750000%
          Z2                      830.661016      4.499414     16.919855      21.419269    813.741161     6.500000%      6.500000%
          R-I   055240DQ5           0.000000      0.000000      0.000000       0.000000      0.000000     6.750000%      6.750000%



------------------------------------------------------------------------------------------------------------------------------------

SELLER:                                    Bank of America                      ADMINISTRATOR:               Kelly L. Shea
SERVICER:                                  Bank of America                                               Bankers Trust Company
LEAD UNDERWRITER:                    Donaldson, Lufkin & Jenrette                                             3 Park Plaza
RECORD DATE:                               January 29, 1999                                                 Irvine, CA 92614
DISTRIBUTION DATE:                        February 25, 1999                     FACTOR INFORMATION:          (800) 735-7777
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                          Page 1 of 5   [C] COPYRIGHT 1999 Bankers Trust Company


<PAGE>



                          BA MORTGAGE SECURITIES, INC.
                       Mortgage Pass-Through Certificates
                                  Series 1998-1
                                    REMIC II
                         Statement To Certificateholders

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                                                        DISTRIBUTIONS IN DOLLARS

                                        PRIOR                                                                               CURRENT
                   ORIGINAL         PRINCIPAL                                                 REALIZED   DEFERRED         PRINCIPAL
    CLASS        FACE VALUE           BALANCE      INTEREST     PRINCIPAL          TOTAL        LOSSES   INTEREST           BALANCE
------------------------------------------------------------------------------------------------------------------------------------
<S>          <C>               <C>             <C>           <C>            <C>                   <C>        <C>     <C>
     IA-1     96,101,504.00     68,281,337.00    384,082.52  2,517,580.01   2,901,662.53          0.00       0.00     65,763,756.99
     IA-2      5,000,000.00      5,000,000.00     28,125.00          0.00      28,125.00          0.00       0.00      5,000,000.00
     IA-3      9,500,000.00      9,500,000.00     53,437.50          0.00      53,437.50          0.00       0.00      9,500,000.00
     IA-4     14,250,000.00     14,250,000.00     80,156.25          0.00      80,156.25          0.00       0.00     14,250,000.00
     IA-5      4,887,000.00      4,887,000.00     27,489.38          0.00      27,489.38          0.00       0.00      4,887,000.00
     IA-6      9,939,000.00      9,939,000.00     55,906.88          0.00      55,906.88          0.00       0.00      9,939,000.00
     I-X *    11,983,709.00      9,109,610.04     51,241.56          0.00      51,241.56          0.00       0.00      8,850,399.31
     I-PO         21,501.00         21,326.66          0.00         19.70          19.70          0.00       0.00         21,306.96
     IIA-1   121,111,453.00    100,117,156.03    542,301.26  2,094,637.81   2,636,939.07          0.00       0.00     98,022,518.22
     IIA-2     1,000,000.00        754,228.62      4,085.41     24,389.25      28,474.66          0.00       0.00        729,839.37
     IIA-3     8,262,000.00      8,262,000.00     44,752.50          0.00      44,752.50          0.00       0.00      8,262,000.00
     IIA-4    14,913,749.00     14,486,693.00     78,469.59     49,141.78     127,611.37          0.00       0.00     14,437,551.22
     IIA-5    46,447,250.00     36,636,089.35    198,445.48  1,184,689.35   1,383,134.83          0.00       0.00     35,451,400.00
     IIA-6     2,127,000.00              0.00          0.00          0.00           0.00          0.00       0.00              0.00
     II-X *    7,513,508.12      5,611,587.52     30,396.10          0.00      30,396.10          0.00       0.00      5,382,099.54
     II-PO       350,133.00        338,956.01          0.00      1,276.60       1,276.60          0.00       0.00        337,679.41


------------------------------------------------------------------------------------------------------------------------------------
TOTALS       333,910,590.00    272,473,786.67  1,578,889.43  5,871,734.50   7,450,623.93          0.00       0.00    266,602,052.17
------------------------------------------------------------------------------------------------------------------------------------
  *Notional Class Balance
</TABLE>


<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                              FACTOR INFORMATION PER $1000 OF ORIGINAL FACE                                  PASS-THROUGH
                                     PRIOR                                                  CURRENT              RATES
                                 PRINCIPAL                                                PRINCIPAL
     CLASS        CUSIP            BALANCE      INTEREST     PRINCIPAL          TOTAL       BALANCE       CURRENT           NEXT
------------------------------------------------------------------------------------------------------------------------------------
<S>           <C>             <C>               <C>           <C>            <C>       <C>              <C>            <C>
     IA-1     055240CT0         710.512678      3.996634     26.197093      30.193727    684.315586     6.750000%      6.750000%
     IA-2     055240CU7       1,000.000000      5.625000      0.000000       5.625000  1,000.000000     6.750000%      6.750000%
     IA-3     055240CV5       1,000.000000      5.625000      0.000000       5.625000  1,000.000000     6.750000%      6.750000%
     IA-4     055240CW3       1,000.000000      5.625000      0.000000       5.625000  1,000.000000     6.750000%      6.750000%
     IA-5     055240CX1       1,000.000000      5.625001      0.000000       5.625001  1,000.000000     6.750000%      6.750000%
     IA-6     055240CY9       1,000.000000      5.625001      0.000000       5.625001  1,000.000000     6.750000%      6.750000%
     I-X *    055240DF9         760.166159      5.625000      0.000000       5.625000    738.535900     6.750000%      0.000000%
     I-PO     055240DH5         991.891540      0.000000      0.916236       0.916236    990.975303     0.000000%      6.500000%
     IIA-1    055240CZ6         826.653083      4.477704     17.295126      21.772830    809.357957     6.500000%      6.500000%
     IIA-2    055240DA0         754.228620      4.085410     24.389250      28.474660    729.839370     6.500000%      6.500000%
     IIA-3    055240DB8       1,000.000000      5.416667      0.000000       5.416667  1,000.000000     6.500000%      6.500000%
     IIA-4    055240DC6         971.364947      5.261560      3.295066       8.556626    968.069881     6.500000%      6.500000%
     IIA-5    055240DD4         788.767674      4.272491     25.506125      29.778616    763.261549     6.500000%      6.500000%
     IIA-6    055240DE2           0.000000      0.000000      0.000000       0.000000      0.000000     6.500000%      6.500000%
     II-X *   055240DG7         746.866502      4.045527      0.000000       4.045527    716.323115     6.500000%      0.000000%
     II-PO    055240DU6         968.077873      0.000000      3.646043       3.646043    964.431830     0.000000%      0.000000%



------------------------------------------------------------------------------------------------------------------------------------
SELLER:                                    Bank of America                      ADMINISTRATOR:               Kelly L. Shea
SERVICER:                                  Bank of America                                               Bankers Trust Company
LEAD UNDERWRITER:                    Donaldson, Lufkin & Jenrette                                             3 Park Plaza
RECORD DATE:                               January 29, 1999                                                 Irvine, CA 92614
DISTRIBUTION DATE:                        February 25, 1999                     FACTOR INFORMATION:          (800) 735-7777
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                          Page 2 of 5   [C] COPYRIGHT 1999 Bankers Trust Company


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       Mortgage Pass-Through Certificates
                                  Series 1998-1

                         Statement To Certificateholders
<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                                                     DISTRIBUTIONS IN DOLLARS
                                       PRIOR                                                                               CURRENT
                     ORIGINAL      PRINCIPAL                                                 REALIZED      DEFERRED      PRINCIPAL
     CLASS         FACE VALUE        BALANCE      INTEREST     PRINCIPAL          TOTAL        LOSSES      INTEREST        BALANCE
------------------------------------------------------------------------------------------------------------------------------------
<S>              <C>            <C>              <C>           <C>            <C>                <C>           <C>    <C>
     M           3,776,882.00   3,700,842.55     20,373.07      8,781.51      29,154.58          0.00          0.00   3,692,061.04
     B-1         2,231,794.00   2,186,861.60     12,038.63      5,189.08      17,227.71          0.00          0.00   2,181,672.52
     B-2         1,201,735.00   1,177,540.64      6,482.34      2,794.12       9,276.46          0.00          0.00   1,174,746.52
     B-3         1,030,060.00   1,009,321.94      5,556.30      2,394.96       7,951.26          0.00          0.00   1,006,926.98
     B-4           515,029.00     504,659.98      2,778.14      1,197.48       3,975.62          0.00          0.00     503,462.50
     B-5           686,706.32     672,880.96      3,704.20      1,596.64       5,300.84          0.00          0.00     671,284.32
     R-II               50.00           0.00          0.00          0.00           0.00          0.00          0.00           0.00

------------------------------------------------------------------------------------------------------------------------------------
TOTALS           9,442,256.32   9,252,107.67     50,932.68     21,953.79      72,886.47          0.00          0.00   9,230,153.88
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>


<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                            FACTOR INFORMATION PER $1000 OF ORIGINAL FACE                                     PASS-THROUGH
                                       PRIOR                                                  CURRENT            RATES
                                   PRINCIPAL                                                PRINCIPAL
     CLASS          CUSIP            BALANCE      INTEREST     PRINCIPAL          TOTAL       BALANCE       CURRENT           NEXT
------------------------------------------------------------------------------------------------------------------------------------
<S>             <C>               <C>             <C>           <C>            <C>         <C>            <C>            <C>
     M          055240DJ1         979.867136      5.394151      2.325069       7.719219    977.542068     6.605978%      6.281794%
     B-1        055240DK8         979.867138      5.394149      2.325071       7.719221    977.542067     6.605978%      6.281794%
     B-2        055240DL6         979.867142      5.394151      2.325072       7.719223    977.542070     6.605978%      6.281794%
     B-3        055240DM4         979.867134      5.394152      2.325068       7.719220    977.542066     6.605978%      6.281794%
     B-4        055240DN2         979.867114      5.394143      2.325073       7.719216    977.542041     6.605978%      6.281794%
     B-5        055240DP7         979.867140      5.394155      2.325070       7.719224    977.542071     6.605978%      6.281794%
     R-II       055240DR3           0.000000      0.000000      0.000000       0.000000      0.000000     6.750000%      6.750000%



------------------------------------------------------------------------------------------------------------------------------------

SELLER:                                    Bank of America                      ADMINISTRATOR:               Kelly L. Shea
SERVICER:                                  Bank of America                                               Bankers Trust Company
LEAD UNDERWRITER:                    Donaldson, Lufkin & Jenrette                                             3 Park Plaza
RECORD DATE:                               January 29, 1999                                                 Irvine, CA 92614
DISTRIBUTION DATE:                        February 25, 1999                     FACTOR INFORMATION:          (800) 735-7777
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                          Page 3 of 5   [C] COPYRIGHT 1999 Bankers Trust Company


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       Mortgage Pass-Through Certificates
                                  Series 1998-1

                         Statement To Certificateholders
<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
Distribution Date:            February 25, 1999
------------------------------------------------------------------------------------------------------------------------------------
MORTGAGE POOL INFORMATION:                                                  GROUP I                     GROUP II
--------------------------                                                  -------                     --------

<S>                                                                      <C>                          <C>
                BEGINNING BALANCE OF POOL                                115,800,753.75               165,925,140.91
                LESS:         SCHEDULED PRINCIPAL                            (96,606.88)                (581,607.87)
                              PRINCIPAL PREPAYMENTS                       (2,424,264.78)              (2,791,208.76)
                              REPURCHASES                                          0.00                        0.00
                              LIQUIDATIONS                                         0.00                        0.00
                              OTHER UNSCHEDULED PRINCIPAL                          0.00                        0.00
                                                                         --------------               --------------
                ENDING BALANCE OF POOL                                   113,279,882.09               162,552,324.28
                                                                         ==============               ==============

                BEGINNING NUMBER OF LOANS IN POOL                                   362                         492
                ENDING NUMBER OF LOANS IN POOL                                      354                         485

                WEIGHTED AVERAGE REMAINING TERM TO MATURITY                         340                         166
                WEIGHTED AVERAGE NET CONTRACT RATE                            7.529754%                   7.100039%

                CURRENT REALIZED LOSSES ON THE POOL                                0.00                        0.00
                CUMULATIVE REALIZED LOSSES ON THE POOL                             0.00                        0.00

                BEGINNING POOL BALANCE OF PREMIUM LOANS                  114,250,923.50               154,169,846.68
                STRIPPED INTEREST RATE                                        0.538200%                   0.236592%


</TABLE>


<TABLE>
<CAPTION>

------------------------------------------------------------------------------------------------------------------------------------
DELINQUENT, BANKRUPTCY,                                                                     LOANS         LOANS         LOANS
FORECLOSURE, AND REO                           30 TO 59      60 TO 89       90 PLUS          IN            IN             IN
LOAN INFORMATION                                 DAYS          DAYS           DAYS       BANKRUPTCY    FORECLOSURE       REO
------------------------------------------------------------------------------------------------------------------------------------
<S>                                             <C>              <C>            <C>           <C>           <C>            <C>
GROUP I         PRINCIPAL BALANCE               376,719.75          0.00           0.00          0.00          0.00           0.00
                     PERCENTAGE OF GROUP BAL.      0.1366%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
                NUMBER OF LOANS                          1             0              0             0             0              0
                     PERCENTAGE OF LOANS           0.1192%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
GROUP II        PRINCIPAL BALANCE                     0.00          0.00           0.00          0.00          0.00           0.00
                     PERCENTAGE OF GROUP BAL.      0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
                NUMBER OF LOANS                          0             0              0             0             0              0
                     PERCENTAGE OF LOANS           0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
------------------------------------------------------------------------------------------------------------------------------------
                GROUP I BOOK VALUE OF REO PROPERTIES                                                            NA
                GROUP II BOOK VALUE OF REO PROPERTIES                                                           NA


SERVICING INFORMATION:                                                      GROUP I                     GROUP II

                SERVICING FEES ACCRUED DURING THE CURRENT DUE PERIOD          24,125.16                   54,407.92
                PLUS:         ADDITIONAL SERVICING COMPENSATION                    0.00                        0.00
                LESS:         AMTS. TO COVER PREPAYMENT INT. SHORTFALL        (8,269.35)                  (6,850.11)
                              DELINQUENT SERVICING FEES                       (3,054.74)                   3,878.93
                                                                         --------------               --------------
                SERVICING FEES COLLECTED FOR THE CURRENT DUE PERIOD           12,801.07                   51,436.74
                                                                         ==============               ==============

                ADVANCED PRINCIPAL                                            12,003.55                   42,320.41
                ADVANCED INTEREST                                             88,982.27                   67,873.56
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                          Page 4 of 5   [C] COPYRIGHT 1999 Bankers Trust Company


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       Mortgage Pass-Through Certificates
                                  Series 1998-1

                         Statement To Certificateholders
<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
Distribution Date:            February 25, 1999
------------------------------------------------------------------------------------------------------------------------------------
                                                 OTHER                                   CUMULATIVE
                                PREPAYMENT    UNSCHEDULED                 CERTIFICATE      UNPAID                     CUMULATIVE
                                PRINCIPAL      PRINCIPAL                    INTEREST      INTEREST                     REALIZED
     CLASS                     DISTRIBUTED    DISTRIBUTED                  SHORTFALL      SHORTFALL                     LOSSES
<S>                             <C>                   <C>                          <C>           <C>                          <C>
       CLASS IA-1               2,424,245.81          0.00                         0.00          0.00                         0.00
       CLASS IA-2                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-3                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-4                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-5                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-6                       0.00          0.00                         0.00          0.00                         0.00
       CLASS I-X                        0.00          0.00                         0.00          0.00                         0.00
       CLASS I-PO                      18.97          0.00                         0.00          0.00                         0.00
       CLASS IIA-1              1,743,093.75          0.00                         0.00          0.00                         0.00
       CLASS IIA-2                 20,295.99          0.00                         0.00          0.00                         0.00
       CLASS IIA-3                      0.00          0.00                         0.00          0.00                         0.00
       CLASS IIA-4                 40,894.30          0.00                         0.00          0.00                         0.00
       CLASS IIA-5                985,862.37          0.00                         0.00          0.00                         0.00
       CLASS IIA-6                      0.00          0.00                         0.00          0.00                         0.00
       CLASS II-X                       0.00          0.00                         0.00          0.00                         0.00
       CLASS II-PO                  1,062.35          0.00                         0.00          0.00                         0.00
       CLASS M                          0.00          0.00                         0.00          0.00                         0.00
       CLASS B-1                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-2                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-3                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-4                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-5                        0.00          0.00                         0.00          0.00                         0.00

------------------------------------------------------------------------------------------------------------------------------------
    TOTALS                      5,215,473.54          0.00                         0.00          0.00                         0.00
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>


<TABLE>
<CAPTION>
<S>                                                                                                          <C>
                OTHER REPORTING ITEMS:

                GROUP I PERCENTAGE                                                                           96.61%
                GROUP I PREPAYMENT PERCENTAGE                                                               100.00%
                GROUP II PERCENTAGE                                                                          96.78%
                GROUP II PREPAYMENT PERCENTAGE                                                              100.00%

                SUBORDINATE PRINCIPAL DISTRIBUTION AMOUNT                                                 21,953.79
                HAS THE CREDIT SUPPORT DEPLETION DATE OCCURRED                                                   No

                BANKRUPTCY AMOUNT                                                                        100,000.00
                FRAUD LOSS AMOUNT                                                                      5,634,517.89
                SPECIAL HAZARD AMOUNT                                                                  4,500,664.47
                EXTRAORDINARY LOSSES FOR THE PRIOR PERIOD                                                      0.00

                GROUP I EXTRAORDINARY LOSSES                                                                   0.00
                GROUP II EXTRAORDINARY LOSSES                                                                  0.00

------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                          Page 5 of 5   [C] COPYRIGHT 1999 Bankers Trust Company


<PAGE>

                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1
                                     REMIC I
                         STATEMENT TO CERTIFICATEHOLDERS

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                                                     DISTRIBUTIONS IN DOLLARS
                                           PRIOR                                                                            CURRENT
                     ORIGINAL          PRINCIPAL                                            REALIZED   DEFERRED           PRINCIPAL
     CLASS         FACE VALUE            BALANCE      INTEREST     PRINCIPAL          TOTAL   LOSSES   INTEREST             BALANCE
------------------------------------------------------------------------------------------------------------------------------------
<S>            <C>                <C>             <C>           <C>           <C>               <C>        <C>       <C>
     P1-M           21,501.00          21,306.96          0.00         19.66          19.66     0.00       0.00           21,287.30
     P2-M          350,133.00         337,679.41          0.00      1,371.70       1,371.70     0.00       0.00          336,307.71
     X1-M *    142,084,361.67     111,731,641.75     49,783.50          0.00      49,783.50     0.00       0.00      109,518,436.88
     X2-M *    187,559,494.52     150,841,825.64     29,153.04          0.00      29,153.04     0.00       0.00      144,448,751.87
     Y1             71,698.81          54,430.78        306.18         16.18         322.36     0.00       0.00           54,414.60
     Y2             99,676.65          73,772.28        399.60        215.88         615.48     0.00       0.00           73,556.40
     Z1        143,556,266.44     113,204,144.24    636,773.31  2,214,668.10   2,851,441.41     0.00       0.00      110,989,476.14
     Z2        199,253,620.42     162,140,872.38    878,263.06  6,440,332.69   7,318,595.75     0.00       0.00      155,700,539.69
     R-I                50.00               0.00          0.00          0.00           0.00     0.00       0.00                0.00


------------------------------------------------------------------------------------------------------------------------------------
TOTALS         343,352,946.32     275,832,206.05  1,594,678.69  8,656,624.21  10,251,302.90     0.00       0.00      267,175,581.84
------------------------------------------------------------------------------------------------------------------------------------
*Notional Class Balance
</TABLE>


<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                            FACTOR INFORMATION PER $1000 OF ORIGINAL FACE                                     PASS-THROUGH
                                       PRIOR                                                  CURRENT            RATES
                                   PRINCIPAL                                                PRINCIPAL
     CLASS          CUSIP            BALANCE      INTEREST     PRINCIPAL          TOTAL       BALANCE       CURRENT           NEXT
------------------------------------------------------------------------------------------------------------------------------------
<S>             <C>                 <C>           <C>           <C>            <C>           <C>          <C>            <C>
          P1-M                    990.975303      0.000000      0.914376       0.914376    990.060927     0.000000%      0.000000%
          P2-M                    964.431830      0.000000      3.917654       3.917654    960.514176     0.000000%      0.000000%
          X1-M *                  786.375365      0.350380      0.000000       0.350380    770.798669     0.534676%      0.534676%
          X2-M *                  804.234550      0.155434      0.000000       0.155434    770.148972     0.231923%      0.231923%
          Y1                      759.158738      4.270364      0.225620       4.495984    758.933072     6.750000%      6.750000%
          Y2                      740.115976      4.008963      2.165810       6.174773    737.950173     6.500000%      6.500000%
          Z1                      788.569855      4.435705     15.427178      19.862884    773.142677     6.750000%      6.750000%
          Z2                      813.741161      4.407765     32.322287      36.730052    781.418874     6.500000%      6.500000%
          R-I   055240DQ5           0.000000      0.000000      0.000000       0.000000      0.000000     6.750000%      6.750000%
------------------------------------------------------------------------------------------------------------------------------------
SELLER:                                    Bank of America                      ADMINISTRATOR:               Kelly L. Shea
SERVICER:                                  Bank of America                                               Bankers Trust Company
LEAD UNDERWRITER:                    Donaldson, Lufkin & Jenrette                                             3 Park Plaza
RECORD DATE:                              February 26, 1999                                                 Irvine, CA 92614
DISTRIBUTION DATE:                          March 25, 1999                      FACTOR INFORMATION:          (800) 735-7777
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                          Page 1 of 5   (C) COPYRIGHT 1999 Bankers Trust Company


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1
                                    REMIC II
                         STATEMENT TO CERTIFICATEHOLDERS

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                                                     DISTRIBUTIONS IN DOLLARS
                                       PRIOR                                                                               CURRENT
                     ORIGINAL      PRINCIPAL                                                 REALIZED      DEFERRED      PRINCIPAL
     CLASS         FACE VALUE        BALANCE      INTEREST     PRINCIPAL          TOTAL        LOSSES      INTEREST        BALANCE
------------------------------------------------------------------------------------------------------------------------------------
<S>            <C>             <C>             <C>           <C>           <C>                    <C>           <C>  <C>
     IA-1       96,101,504.00   65,763,756.99    369,921.13  2,211,394.13   2,581,315.26          0.00          0.00  63,552,362.86
     IA-2        5,000,000.00    5,000,000.00     28,125.00          0.00      28,125.00          0.00          0.00   5,000,000.00
     IA-3        9,500,000.00    9,500,000.00     53,437.50          0.00      53,437.50          0.00          0.00   9,500,000.00
     IA-4       14,250,000.00   14,250,000.00     80,156.25          0.00      80,156.25          0.00          0.00  14,250,000.00
     IA-5        4,887,000.00    4,887,000.00     27,489.38          0.00      27,489.38          0.00          0.00   4,887,000.00
     IA-6        9,939,000.00    9,939,000.00     55,906.88          0.00      55,906.88          0.00          0.00   9,939,000.00
     I-X *      11,983,709.00    8,850,399.31     49,783.50          0.00      49,783.50          0.00          0.00   8,636,495.87
     I-PO           21,501.00       21,306.96          0.00         19.66          19.66          0.00          0.00      21,287.30
     IIA-1     121,111,453.00   98,022,518.22    530,955.31  4,012,111.68   4,543,066.99          0.00          0.00  94,010,406.54
     IIA-2       1,000,000.00      729,839.37      3,953.30     47,637.64      51,590.94          0.00          0.00     682,201.73
     IIA-3       8,262,000.00    8,262,000.00     44,752.50          0.00      44,752.50          0.00          0.00   8,262,000.00
     IIA-4      14,913,749.00   14,437,551.22     78,203.40     48,420.49     126,623.89          0.00          0.00  14,389,130.73
     IIA-5      46,447,250.00   35,451,400.00    192,028.42  2,313,962.67   2,505,991.09          0.00          0.00  33,137,437.33
     IIA-6       2,127,000.00            0.00          0.00          0.00           0.00          0.00          0.00           0.00
     II-X *      7,513,508.12    5,382,099.54     29,153.04          0.00      29,153.04          0.00          0.00   5,024,152.01
     II-PO         350,133.00      337,679.41          0.00      1,371.70       1,371.70          0.00          0.00     336,307.71


TOTALS         333,910,590.00  266,602,052.17  1,543,865.61  8,634,917.97  10,178,783.58          0.00          0.00 257,967,134.20
------------------------------------------------------------------------------------------------------------------------------------
*Notional Class Balance
</TABLE>


<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                            FACTOR INFORMATION PER $1000 OF ORIGINAL FACE                                     PASS-THROUGH
                                       PRIOR                                                  CURRENT            RATES
                                   PRINCIPAL                                                PRINCIPAL
     CLASS          CUSIP            BALANCE      INTEREST     PRINCIPAL          TOTAL       BALANCE       CURRENT           NEXT
------------------------------------------------------------------------------------------------------------------------------------
<S>             <C>             <C>               <C>           <C>            <C>       <C>              <C>            <C>
     IA-1       055240CT0         684.315586      3.849275     23.011025      26.860300    661.304560     6.750000%      6.750000%
     IA-2       055240CU7       1,000.000000      5.625000      0.000000       5.625000  1,000.000000     6.750000%      6.750000%
     IA-3       055240CV5       1,000.000000      5.625000      0.000000       5.625000  1,000.000000     6.750000%      6.750000%
     IA-4       055240CW3       1,000.000000      5.625000      0.000000       5.625000  1,000.000000     6.750000%      6.750000%
     IA-5       055240CX1       1,000.000000      5.625001      0.000000       5.625001  1,000.000000     6.750000%      6.750000%
     IA-6       055240CY9       1,000.000000      5.625001      0.000000       5.625001  1,000.000000     6.750000%      6.750000%
     I-X *      055240DF9         738.535900      5.625000      0.000000       5.625000    720.686381     6.750000%      0.000000%
     I-PO       055240DH5         990.975303      0.000000      0.914376       0.914376    990.060927     0.000000%      6.500000%
     IIA-1      055240CZ6         809.357957      4.384022     33.127434      37.511456    776.230523     6.500000%      6.500000%
     IIA-2      055240DA0         729.839370      3.953300     47.637640      51.590940    682.201730     6.500000%      6.500000%
     IIA-3      055240DB8       1,000.000000      5.416667      0.000000       5.416667  1,000.000000     6.500000%      6.500000%
     IIA-4      055240DC6         968.069881      5.243712      3.246701       8.490413    964.823180     6.500000%      6.500000%
     IIA-5      055240DD4         763.261549      4.134333     49.819153      53.953487    713.442396     6.500000%      6.500000%
     IIA-6      055240DE2           0.000000      0.000000      0.000000       0.000000      0.000000     6.500000%      6.500000%
     II-X *     055240DG7         716.323115      3.880084      0.000000       3.880084    668.682582     6.500000%      0.000000%
     II-PO      055240DU6         964.431830      0.000000      3.917654       3.917654    960.514176     0.000000%      0.000000%

------------------------------------------------------------------------------------------------------------------------------------
SELLER:                                    Bank of America                      ADMINISTRATOR:               Kelly L. Shea
SERVICER:                                  Bank of America                                               Bankers Trust Company
LEAD UNDERWRITER:                    Donaldson, Lufkin & Jenrette                                             3 Park Plaza
RECORD DATE:                              February 26, 1999                                                 Irvine, CA 92614
DISTRIBUTION DATE:                          March 25, 1999                      FACTOR INFORMATION:          (800) 735-7777
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                          Page 2 of 5   (C) COPYRIGHT 1999 Bankers Trust Company


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1
                         STATEMENT TO CERTIFICATEHOLDERS


<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                                                     DISTRIBUTIONS IN DOLLARS
                                       PRIOR                                                                               CURRENT
                     ORIGINAL      PRINCIPAL                                                 REALIZED      DEFERRED      PRINCIPAL
     CLASS         FACE VALUE        BALANCE      INTEREST     PRINCIPAL          TOTAL        LOSSES      INTEREST        BALANCE
------------------------------------------------------------------------------------------------------------------------------------
<S>              <C>            <C>              <C>           <C>            <C>                <C>           <C>    <C>
     M           3,776,882.00   3,692,061.04     20,325.23      8,682.49      29,007.72          0.00          0.00   3,683,378.55
     B-1         2,231,794.00   2,181,672.52     12,010.36      5,130.57      17,140.93          0.00          0.00   2,176,541.95
     B-2         1,201,735.00   1,174,746.52      6,467.12      2,762.61       9,229.73          0.00          0.00   1,171,983.91
     B-3         1,030,060.00   1,006,926.98      5,543.25      2,367.96       7,911.21          0.00          0.00   1,004,559.02
     B-4           515,029.00     503,462.50      2,771.62      1,183.98       3,955.60          0.00          0.00     502,278.52
     B-5           686,706.32     671,284.32      3,695.50      1,578.63       5,274.13          0.00          0.00     669,705.69
     R-II               50.00           0.00          0.00          0.00           0.00          0.00          0.00           0.00




TOTALS           9,442,256.32   9,230,153.88     50,813.08     21,706.24      72,519.32          0.00          0.00   9,208,447.64
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>


<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                            FACTOR INFORMATION PER $1000 OF ORIGINAL FACE                                     PASS-THROUGH
                                       PRIOR                                                  CURRENT            RATES
                                   PRINCIPAL                                                PRINCIPAL
     CLASS          CUSIP            BALANCE      INTEREST     PRINCIPAL          TOTAL       BALANCE       CURRENT           NEXT
------------------------------------------------------------------------------------------------------------------------------------
<S>             <C>               <C>             <C>           <C>            <C>         <C>            <C>            <C>
     M          055240DJ1         977.542068      5.381484      2.298851       7.680335    975.243216     6.606142%      6.286692%
     B-1        055240DK8         977.542067      5.381482      2.298855       7.680337    975.243212     6.606142%      6.286692%
     B-2        055240DL6         977.542070      5.381486      2.298851       7.680337    975.243219     6.606142%      6.286692%
     B-3        055240DM4         977.542066      5.381483      2.298856       7.680339    975.243209     6.606142%      6.286692%
     B-4        055240DN2         977.542041      5.381483      2.298861       7.680344    975.243180     6.606142%      6.286692%
     B-5        055240DP7         977.542071      5.381485      2.298843       7.680328    975.243228     6.606142%      6.286692%
     R-II       055240DR3           0.000000      0.000000      0.000000       0.000000      0.000000     6.750000%      6.750000%

------------------------------------------------------------------------------------------------------------------------------------
SELLER:                                    Bank of America                      ADMINISTRATOR:               Kelly L. Shea
SERVICER:                                  Bank of America                                               Bankers Trust Company
LEAD UNDERWRITER:                    Donaldson, Lufkin & Jenrette                                             3 Park Plaza
RECORD DATE:                              February 26, 1999                                                 Irvine, CA 92614
DISTRIBUTION DATE:                          March 25, 1999                           FACTOR INFORMATION:     (800) 735-7777
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                          Page 3 of 5   (C) COPYRIGHT 1999 Bankers Trust Company


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1
                         STATEMENT TO CERTIFICATEHOLDERS


<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
Distribution Date:            March 25, 1999
------------------------------------------------------------------------------------------------------------------------------------
MORTGAGE POOL INFORMATION:                                                  GROUP I                     GROUP II
--------------------------                                                  -------                     --------

<S>                                                                      <C>                          <C>
                BEGINNING BALANCE OF POOL                                113,279,882.09               162,552,324.28
                LESS:         SCHEDULED PRINCIPAL                            (95,108.82)                (563,680.88)
                              PRINCIPAL PREPAYMENTS                       (2,119,595.12)              (5,878,239.39)
                              REPURCHASES                                          0.00                        0.00
                              LIQUIDATIONS                                         0.00                        0.00
                              OTHER UNSCHEDULED PRINCIPAL                          0.00                        0.00
                                                                         --------------               --------------
                ENDING BALANCE OF POOL                                   111,065,178.15               156,110,404.01
                                                                         ==============               ==============

                BEGINNING NUMBER OF LOANS IN POOL                                   354                         485
                ENDING NUMBER OF LOANS IN POOL                                      348                         466

                WEIGHTED AVERAGE REMAINING TERM TO MATURITY                         340                         165
                WEIGHTED AVERAGE NET CONTRACT RATE                            7.526098%                   7.094084%

                CURRENT REALIZED LOSSES ON THE POOL                                0.00                        0.00
                CUMULATIVE REALIZED LOSSES ON THE POOL                             0.00                        0.00

                BEGINNING POOL BALANCE OF PREMIUM LOANS                  111,731,641.75               150,841,825.64
                STRIPPED INTEREST RATE                                        0.534676%                   0.231923%
</TABLE>

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
DELINQUENT, BANKRUPTCY,                                                                     LOANS         LOANS         LOANS
FORECLOSURE, AND REO                           30 TO 59      60 TO 89       90 PLUS          IN            IN             IN
LOAN INFORMATION                                 DAYS          DAYS           DAYS       BANKRUPTCY    FORECLOSURE       REO
------------------------------------------------------------------------------------------------------------------------------------
<S>                                                <C>           <C>            <C>           <C>           <C>            <C>
GROUP I         PRINCIPAL BALANCE                     0.00          0.00           0.00          0.00          0.00           0.00
                     PERCENTAGE OF GROUP BAL.      0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
                NUMBER OF LOANS                          0             0              0             0             0              0
                     PERCENTAGE OF LOANS           0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
GROUP II        PRINCIPAL BALANCE                     0.00          0.00           0.00          0.00          0.00           0.00
                     PERCENTAGE OF GROUP BAL.      0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
                NUMBER OF LOANS                          0             0              0             0             0              0
                     PERCENTAGE OF LOANS           0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%

------------------------------------------------------------------------------------------------------------------------------------
                GROUP I BOOK VALUE OF REO PROPERTIES                                                             NA
                GROUP II BOOK VALUE OF REO PROPERTIES                                                            NA
</TABLE>


<TABLE>
<CAPTION>

SERVICING INFORMATION:                                                      GROUP I                     GROUP II
----------------------                                                      -------                     --------

<S>                                                                      <C>                         <C>
                SERVICING FEES ACCRUED DURING THE CURRENT DUE PERIOD          23,599.98                   53,150.85
                PLUS:         ADDITIONAL SERVICING COMPENSATION                    0.00                        0.00
                LESS:         AMTS. TO COVER PREPAYMENT INT. SHORTFALL        (7,067.07)                 (18,386.42)
                              DELINQUENT SERVICING FEES                       (1,267.93)                   1,938.69
                                                                         --------------               --------------
                SERVICING FEES COLLECTED FOR THE CURRENT DUE PERIOD           15,264.98                   36,703.12
                                                                         ==============               ==============
                ADVANCED PRINCIPAL                                             5,042.88                   19,661.41
                ADVANCED INTEREST                                             37,047.87                   31,208.59

------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                          Page 4 of 5   (C) COPYRIGHT 1999 Bankers Trust Company


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1
                         STATEMENT TO CERTIFICATEHOLDERS
<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
Distribution Date:            March 25, 1999
------------------------------------------------------------------------------------------------------------------------------------
                                                 OTHER                                   CUMULATIVE
                                PREPAYMENT    UNSCHEDULED                 CERTIFICATE      UNPAID                     CUMULATIVE
                                PRINCIPAL      PRINCIPAL                    INTEREST      INTEREST                     REALIZED
     CLASS                     DISTRIBUTED    DISTRIBUTED                  SHORTFALL      SHORTFALL                     LOSSES
<S>                           <C>                   <C>                          <C>           <C>                          <C>
     CLASS IA-1               2,119,576.28          0.00                         0.00          0.00                         0.00
     CLASS IA-2                       0.00          0.00                         0.00          0.00                         0.00
     CLASS IA-3                       0.00          0.00                         0.00          0.00                         0.00
     CLASS IA-4                       0.00          0.00                         0.00          0.00                         0.00
     CLASS IA-5                       0.00          0.00                         0.00          0.00                         0.00
     CLASS IA-6                       0.00          0.00                         0.00          0.00                         0.00
     CLASS I-X                        0.00          0.00                         0.00          0.00                         0.00
     CLASS I-PO                      18.84          0.00                         0.00          0.00                         0.00
     CLASS IIA-1              3,671,540.06          0.00                         0.00          0.00                         0.00
     CLASS IIA-2                 43,593.88          0.00                         0.00          0.00                         0.00
     CLASS IIA-3                      0.00          0.00                         0.00          0.00                         0.00
     CLASS IIA-4                 44,310.27          0.00                         0.00          0.00                         0.00
     CLASS IIA-5              2,117,539.92          0.00                         0.00          0.00                         0.00
     CLASS IIA-6                      0.00          0.00                         0.00          0.00                         0.00
     CLASS II-X                       0.00          0.00                         0.00          0.00                         0.00
     CLASS II-PO                  1,255.26          0.00                         0.00          0.00                         0.00
     CLASS M                          0.00          0.00                         0.00          0.00                         0.00
     CLASS B-1                        0.00          0.00                         0.00          0.00                         0.00
     CLASS B-2                        0.00          0.00                         0.00          0.00                         0.00
     CLASS B-3                        0.00          0.00                         0.00          0.00                         0.00
     CLASS B-4                        0.00          0.00                         0.00          0.00                         0.00
     CLASS B-5                        0.00          0.00                         0.00          0.00                         0.00

    TOTALS                    7,997,834.51          0.00                         0.00          0.00                         0.00
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>


<TABLE>
<CAPTION>

                OTHER REPORTING ITEMS:

<S>                                                                                                    <C>
                GROUP I PERCENTAGE                                                                           96.54%
                GROUP I PREPAYMENT PERCENTAGE                                                               100.00%
                GROUP II PERCENTAGE                                                                          96.73%
                GROUP II PREPAYMENT PERCENTAGE                                                              100.00%

                SUBORDINATE PRINCIPAL DISTRIBUTION AMOUNT                                                 21,706.24
                HAS THE CREDIT SUPPORT DEPLETION DATE OCCURRED                                                   No

                BANKRUPTCY AMOUNT                                                                        100,000.00
                FRAUD LOSS AMOUNT                                                                      5,516,644.13
                SPECIAL HAZARD AMOUNT                                                                  4,500,664.47
                EXTRAORDINARY LOSSES FOR THE PRIOR PERIOD                                                      0.00

                GROUP I EXTRAORDINARY LOSSES                                                                   0.00
                GROUP II EXTRAORDINARY LOSSES                                                                  0.00

------------------------------------------------------------------------------------------------------------------------------------
</TABLE>

                          Page 5 of 5   (C) COPYRIGHT 1999 Bankers Trust Company


<PAGE>

                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1
                                     REMIC I
                         STATEMENT TO CERTIFICATEHOLDERS

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                                                     DISTRIBUTIONS IN DOLLARS
                                           PRIOR                                                                             CURRENT
                     ORIGINAL          PRINCIPAL                                                 REALIZED      DEFERRED    PRINCIPAL
     CLASS         FACE VALUE            BALANCE      INTEREST     PRINCIPAL          TOTAL        LOSSES      INTEREST      BALANCE
------------------------------------------------------------------------------------------------------------------------------------
<S>            <C>                <C>             <C>          <C>            <C>                    <C>        <C>  <C>
     P1-M           21,501.00          21,287.30          0.00         19.92          19.92          0.00       0.00      21,267.38
     P2-M          350,133.00         336,307.71          0.00      1,396.80       1,396.80          0.00       0.00     334,910.91
     X1-M *    142,084,361.67     109,518,436.88     48,580.29          0.00      48,580.29          0.00       0.00 104,383,874.87
     X2-M *    187,559,494.52     144,448,751.87     27,214.16          0.00      27,214.16          0.00       0.00 138,734,377.50
     Y1             71,698.81          54,414.60        306.08      4,028.80       4,334.89          0.00       0.00      50,385.80
     Y2             99,676.65          73,556.40        398.43      5,629.16       6,027.59          0.00       0.00      67,927.24
     Z1        143,556,266.44     110,989,476.14    624,315.80  5,132,120.98   5,756,436.78          0.00       0.00 105,857,355.16
     Z2        199,253,620.42     155,700,539.69    843,377.92  5,758,053.10   6,601,431.02          0.00       0.00 149,942,486.59
     R-I                50.00               0.00          0.00          0.00           0.00          0.00       0.00           0.00

------------------------------------------------------------------------------------------------------------------------------------
TOTALS         343,352,946.32     267,175,581.84  1,544,192.68 10,901,248.77  12,445,441.45          0.00       0.00 256,274,333.08
------------------------------------------------------------------------------------------------------------------------------------
  *Notional Class Balance
</TABLE>


<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                            FACTOR INFORMATION PER $1000 OF ORIGINAL FACE                                     PASS-THROUGH
                                       PRIOR                                                  CURRENT            RATES
                                   PRINCIPAL                                                PRINCIPAL
     CLASS          CUSIP            BALANCE      INTEREST     PRINCIPAL          TOTAL       BALANCE       CURRENT           NEXT
------------------------------------------------------------------------------------------------------------------------------------
<S>             <C>                 <C>           <C>           <C>            <C>           <C>          <C>            <C>
     P1-M                         990.060927      0.000000      0.926469       0.926469    989.134459     0.000000%      0.000000%
     P2-M                         960.514176      0.000000      3.989341       3.989341    956.524835     0.000000%      0.000000%
     X1-M *                       770.798669      0.341912      0.000000       0.341912    734.661251     0.532297%      0.532297%
     X2-M *                       770.148972      0.145096      0.000000       0.145096    739.681976     0.226080%      0.226080%
     Y1                           758.933072      4.269025     56.190671      60.459695    702.742462     6.750000%      6.750000%
     Y2                           737.950173      3.997225     56.474194      60.471419    681.475963     6.500000%      6.500000%
     Z1                           773.142677      4.348928     35.749892      40.098819    737.392785     6.750000%      6.750000%
     Z2                           781.418874      4.232686     28.898110      33.130796    752.520764     6.500000%      6.500000%
     R-I        055240DQ5           0.000000      0.000000      0.000000       0.000000      0.000000     6.750000%      6.750000%

------------------------------------------------------------------------------------------------------------------------------------
SELLER:                                    Bank of America                      ADMINISTRATOR:               Kelly L. Shea
SERVICER:                                  Bank of America                                               Bankers Trust Company
LEAD UNDERWRITER:                    Donaldson, Lufkin & Jenrette                                             3 Park Plaza
RECORD DATE:                                March 31, 1999                                                  Irvine, CA 92614
DISTRIBUTION DATE:                          April 26, 1999                      FACTOR INFORMATION:          (800) 735-7777
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                           Page 1 of 5  (C) COPYRIGHT 1999 Bankers Trust Company


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1
                                    REMIC II

                         STATEMENT TO CERTIFICATEHOLDERS
<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                                                               DISTRIBUTIONS IN DOLLARS
                                            PRIOR                                                                           CURRENT
                     ORIGINAL           PRINCIPAL                                                 REALIZED  DEFERRED      PRINCIPAL
     CLASS         FACE VALUE             BALANCE      INTEREST        PRINCIPAL          TOTAL     LOSSES  INTEREST        BALANCE
------------------------------------------------------------------------------------------------------------------------------------
<S>            <C>                 <C>             <C>             <C>            <C>                 <C>       <C>  <C>
     IA-1       96,101,504.00       63,552,362.86    357,482.04     5,132,919.52   5,490,401.56       0.00      0.00  58,419,443.34
     IA-2        5,000,000.00        5,000,000.00     28,125.00             0.00      28,125.00       0.00      0.00   5,000,000.00
     IA-3        9,500,000.00        9,500,000.00     53,437.50             0.00      53,437.50       0.00      0.00   9,500,000.00
     IA-4       14,250,000.00       14,250,000.00     80,156.25             0.00      80,156.25       0.00      0.00  14,250,000.00
     IA-5        4,887,000.00        4,887,000.00     27,489.38             0.00      27,489.38       0.00      0.00   4,887,000.00
     IA-6        9,939,000.00        9,939,000.00     55,906.88             0.00      55,906.88       0.00      0.00   9,939,000.00
     I-X *      11,983,709.00        8,636,495.87     48,580.27             0.00      48,580.27       0.00      0.00   8,156,461.73
     I-PO           21,501.00           21,287.30          0.00            19.92          19.92       0.00      0.00      21,267.38
     IIA-1     121,111,453.00       94,010,406.54    509,223.04     3,589,146.47   4,098,369.51       0.00      0.00  90,421,260.07
     IIA-2       1,000,000.00          682,201.73      3,695.26        42,504.83      46,200.09       0.00      0.00     639,696.90
     IIA-3       8,262,000.00        8,262,000.00     44,752.50             0.00      44,752.50       0.00      0.00   8,262,000.00
     IIA-4      14,913,749.00       14,389,130.73     77,941.12        48,806.21     126,747.33       0.00      0.00  14,340,324.52
     IIA-5      46,447,250.00       33,137,437.33    179,494.45     2,064,640.32   2,244,134.77       0.00      0.00  31,072,797.01
     IIA-6       2,127,000.00                0.00          0.00             0.00           0.00       0.00      0.00           0.00
     II-X *      7,513,508.12        5,024,152.01     27,214.16             0.00      27,214.16       0.00      0.00   4,770,461.78
     II-PO         350,133.00          336,307.71          0.00         1,396.80       1,396.80       0.00      0.00     334,910.91

------------------------------------------------------------------------------------------------------------------------------------
TOTALS         333,910,590.00      257,967,134.20  1,493,497.85    10,879,434.08  12,372,931.93       0.00      0.00 247,087,700.13
------------------------------------------------------------------------------------------------------------------------------------
  *Notional Class Balance
</TABLE>


<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                            FACTOR INFORMATION PER $1000 OF ORIGINAL FACE                                     PASS-THROUGH
                                       PRIOR                                                  CURRENT            RATES
                                   PRINCIPAL                                                PRINCIPAL
     CLASS          CUSIP            BALANCE      INTEREST     PRINCIPAL          TOTAL       BALANCE       CURRENT           NEXT
------------------------------------------------------------------------------------------------------------------------------------
<S>             <C>               <C>             <C>          <C>            <C>          <C>            <C>            <C>
     IA-1       055240CT0         661.304560      3.719838     53.411438      57.131276    607.893122     6.750000%      6.750000%
     IA-2       055240CU7       1,000.000000      5.625000      0.000000       5.625000  1,000.000000     6.750000%      6.750000%
     IA-3       055240CV5       1,000.000000      5.625000      0.000000       5.625000  1,000.000000     6.750000%      6.750000%
     IA-4       055240CW3       1,000.000000      5.625000      0.000000       5.625000  1,000.000000     6.750000%      6.750000%
     IA-5       055240CX1       1,000.000000      5.625001      0.000000       5.625001  1,000.000000     6.750000%      6.750000%
     IA-6       055240CY9       1,000.000000      5.625001      0.000000       5.625001  1,000.000000     6.750000%      6.750000%
     I-X *      055240DF9         720.686381      5.624998      0.000000       5.624998    680.629155     6.750000%      0.000000%
     I-PO       055240DH5         990.060927      0.000000      0.926469       0.926469    989.134459     0.000000%      6.500000%
     IIA-1      055240CZ6         776.230523      4.204582     29.635071      33.839653    746.595453     6.500000%      6.500000%
     IIA-2      055240DA0         682.201730      3.695260     42.504830      46.200090    639.696900     6.500000%      6.500000%
     IIA-3      055240DB8       1,000.000000      5.416667      0.000000       5.416667  1,000.000000     6.500000%      6.500000%
     IIA-4      055240DC6         964.823180      5.226125      3.272565       8.498690    961.550615     6.500000%      6.500000%
     IIA-5      055240DD4         713.442396      3.864480     44.451293      48.315773    668.991103     6.500000%      6.500000%
     IIA-6      055240DE2           0.000000      0.000000      0.000000       0.000000      0.000000     6.500000%      6.500000%
     II-X *     055240DG7         668.682582      3.622031      0.000000       3.622031    634.918031     6.500000%      0.000000%
     II-PO      055240DU6         960.514176      0.000000      3.989341       3.989341    956.524835     0.000000%      0.000000%


------------------------------------------------------------------------------------------------------------------------------------
SELLER:                                    Bank of America                      ADMINISTRATOR:               Kelly L. Shea
SERVICER:                                  Bank of America                                               Bankers Trust Company
LEAD UNDERWRITER:                    Donaldson, Lufkin & Jenrette                                             3 Park Plaza
RECORD DATE:                                March 31, 1999                                                  Irvine, CA 92614
DISTRIBUTION DATE:                          April 26, 1999                           FACTOR INFORMATION:     (800) 735-7777
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                          Page 2 of 5   (C) COPYRIGHT 1999 Bankers Trust Company


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1
                         STATEMENT TO CERTIFICATEHOLDERS

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                                                     DISTRIBUTIONS IN DOLLARS
                                       PRIOR                                                                               CURRENT
                     ORIGINAL      PRINCIPAL                                                 REALIZED      DEFERRED      PRINCIPAL
     CLASS         FACE VALUE        BALANCE      INTEREST     PRINCIPAL          TOTAL        LOSSES      INTEREST        BALANCE
------------------------------------------------------------------------------------------------------------------------------------
<S>              <C>            <C>              <C>           <C>            <C>                <C>           <C>    <C>
     M           3,776,882.00   3,683,378.55     20,277.93      8,725.87      29,003.80          0.00          0.00   3,674,652.68
     B-1         2,231,794.00   2,176,541.95     11,982.41      5,156.20      17,138.61          0.00          0.00   2,171,385.75
     B-2         1,201,735.00   1,171,983.91      6,452.07      2,776.41       9,228.48          0.00          0.00   1,169,207.50
     B-3         1,030,060.00   1,004,559.02      5,530.35      2,379.79       7,910.14          0.00          0.00   1,002,179.23
     B-4           515,029.00     502,278.52      2,765.17      1,189.89       3,955.06          0.00          0.00     501,088.63
     B-5           686,706.32     669,705.69      3,686.90      1,586.53       5,273.43          0.00          0.00     668,119.16
     R-II               50.00           0.00          0.00          0.00           0.00          0.00          0.00           0.00

------------------------------------------------------------------------------------------------------------------------------------
TOTALS           9,442,256.32   9,208,447.64     50,694.83     21,814.69      72,509.52          0.00          0.00   9,186,632.95
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                            FACTOR INFORMATION PER $1000 OF ORIGINAL FACE                                     PASS-THROUGH
                                       PRIOR                                                  CURRENT            RATES
                                   PRINCIPAL                                                PRINCIPAL
     CLASS          CUSIP            BALANCE      INTEREST     PRINCIPAL          TOTAL       BALANCE       CURRENT           NEXT
------------------------------------------------------------------------------------------------------------------------------------
<S>             <C>               <C>             <C>           <C>            <C>         <C>            <C>            <C>
     M          055240DJ1         975.243216      5.368960      2.310337       7.679297    972.932880     6.606303%      6.300368%
     B-1        055240DK8         975.243212      5.368959      2.310339       7.679297    972.932874     6.606303%      6.300368%
     B-2        055240DL6         975.243219      5.368962      2.310335       7.679297    972.932885     6.606303%      6.300368%
     B-3        055240DM4         975.243209      5.368959      2.310341       7.679300    972.932868     6.606303%      6.300368%
     B-4        055240DN2         975.243180      5.368960      2.310336       7.679296    972.932845     6.606303%      6.300368%
     B-5        055240DP7         975.243228      5.368962      2.310341       7.679303    972.932881     6.606303%      6.300368%
     R-II       055240DR3           0.000000      0.000000      0.000000       0.000000      0.000000     6.750000%      6.750000%


------------------------------------------------------------------------------------------------------------------------------------
SELLER:                                    Bank of America                      ADMINISTRATOR:               Kelly L. Shea
SERVICER:                                  Bank of America                                               Bankers Trust Company
LEAD UNDERWRITER:                    Donaldson, Lufkin & Jenrette                                             3 Park Plaza
RECORD DATE:                                March 31, 1999                                                  Irvine, CA 92614
DISTRIBUTION DATE:                          April 26, 1999                      FACTOR INFORMATION:          (800) 735-7777
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                          Page 3 of 5   (C) COPYRIGHT 1999 Bankers Trust Company


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1

                         STATEMENT TO CERTIFICATEHOLDERS
<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
Distribution Date:            April 26, 1999
------------------------------------------------------------------------------------------------------------------------------------

MORTGAGE POOL INFORMATION:                                                  GROUP I                     GROUP II
--------------------------                                                  -------                     --------
<S>                                                                      <C>                          <C>
                BEGINNING BALANCE OF POOL                                111,065,178.15               156,110,404.01
                LESS:         SCHEDULED PRINCIPAL                            (91,629.71)                (548,190.29)
                              PRINCIPAL PREPAYMENTS                       (5,044,540.00)              (5,216,888.77)
                              REPURCHASES                                          0.00                        0.00
                              LIQUIDATIONS                                         0.00                        0.00
                              OTHER UNSCHEDULED PRINCIPAL                          0.00                        0.00
                                                                         --------------               --------------
                ENDING BALANCE OF POOL                                   105,929,008.44               150,345,324.95
                                                                         ==============               ==============

                BEGINNING NUMBER OF LOANS IN POOL                                   348                         466
                ENDING NUMBER OF LOANS IN POOL                                      334                         451

                WEIGHTED AVERAGE REMAINING TERM TO MATURITY                         338                         164
                WEIGHTED AVERAGE NET CONTRACT RATE                            7.523590%                   7.085367%

                CURRENT REALIZED LOSSES ON THE POOL                                0.00                        0.00
                CUMULATIVE REALIZED LOSSES ON THE POOL                             0.00                        0.00

                BEGINNING POOL BALANCE OF PREMIUM LOANS                  109,518,436.88               144,448,751.87
                STRIPPED INTEREST RATE                                        0.532297%                   0.226080%
</TABLE>

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
DELINQUENT, BANKRUPTCY,                                                                     LOANS         LOANS         LOANS
FORECLOSURE, AND REO                           30 TO 59      60 TO 89       90 PLUS          IN            IN             IN
LOAN INFORMATION                                 DAYS          DAYS           DAYS       BANKRUPTCY    FORECLOSURE       REO
------------------------------------------------------------------------------------------------------------------------------------
<S>                                                <C>           <C>            <C>           <C>           <C>            <C>
GROUP I         PRINCIPAL BALANCE                     0.00          0.00           0.00          0.00          0.00           0.00
                     PERCENTAGE OF GROUP BAL.      0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
                NUMBER OF LOANS                          0             0              0             0             0              0
                     PERCENTAGE OF LOANS           0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
GROUP II        PRINCIPAL BALANCE                     0.00          0.00           0.00          0.00          0.00           0.00
                     PERCENTAGE OF GROUP BAL.      0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
                NUMBER OF LOANS                          0             0              0             0             0              0
                     PERCENTAGE OF LOANS           0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
------------------------------------------------------------------------------------------------------------------------------------
                GROUP I BOOK VALUE OF REO PROPERTIES                                                             NA
                GROUP II BOOK VALUE OF REO PROPERTIES                                                            NA
</TABLE>

<TABLE>
<CAPTION>

SERVICING INFORMATION:                                                      GROUP I                     GROUP II
----------------------                                                      -------                     --------

<S>                                                                           <C>                         <C>
                SERVICING FEES ACCRUED DURING THE CURRENT DUE PERIOD          23,138.58                   50,759.06
                PLUS:         ADDITIONAL SERVICING COMPENSATION                    0.00                        0.00
                LESS:         AMTS. TO COVER PREPAYMENT INT. SHORTFALL       (19,163.38)                 (16,867.32)
                              DELINQUENT SERVICING FEES                       (1,159.07)                   1,657.04
                                                                         --------------               --------------
                SERVICING FEES COLLECTED FOR THE CURRENT DUE PERIOD            2,816.13                   35,548.78
                                                                         ==============               ==============

                ADVANCED PRINCIPAL                                             4,795.76                   18,362.21
                ADVANCED INTEREST                                             33,397.41                   29,178.44
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                          Page 4 of 5   (C) COPYRIGHT 1999 Bankers Trust Company


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1

                         STATEMENT TO CERTIFICATEHOLDERS
<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
Distribution Date:            April 26, 1999
------------------------------------------------------------------------------------------------------------------------------------
                                                 OTHER                                   CUMULATIVE
                                PREPAYMENT    UNSCHEDULED                 CERTIFICATE      UNPAID                     CUMULATIVE
                                PRINCIPAL      PRINCIPAL                    INTEREST      INTEREST                     REALIZED
     CLASS                     DISTRIBUTED    DISTRIBUTED                  SHORTFALL      SHORTFALL                     LOSSES
------------------------------------------------------------------------------------------------------------------------------------
<S>                             <C>                   <C>                          <C>           <C>                          <C>
       CLASS IA-1               5,044,520.42          0.00                         0.00          0.00                         0.00
       CLASS IA-2                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-3                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-4                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-5                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-6                       0.00          0.00                         0.00          0.00                         0.00
       CLASS I-X                        0.00          0.00                         0.00          0.00                         0.00
       CLASS I-PO                      19.58          0.00                         0.00          0.00                         0.00
       CLASS IIA-1              3,258,365.16          0.00                         0.00          0.00                         0.00
       CLASS IIA-2                 38,587.52          0.00                         0.00          0.00                         0.00
       CLASS IIA-3                      0.00          0.00                         0.00          0.00                         0.00
       CLASS IIA-4                 44,308.16          0.00                         0.00          0.00                         0.00
       CLASS IIA-5              1,874,359.86          0.00                         0.00          0.00                         0.00
       CLASS IIA-6                      0.00          0.00                         0.00          0.00                         0.00
       CLASS II-X                       0.00          0.00                         0.00          0.00                         0.00
       CLASS II-PO                  1,268.07          0.00                         0.00          0.00                         0.00
       CLASS M                          0.00          0.00                         0.00          0.00                         0.00
       CLASS B-1                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-2                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-3                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-4                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-5                        0.00          0.00                         0.00          0.00                         0.00
------------------------------------------------------------------------------------------------------------------------------------
    TOTALS                     10,261,428.77          0.00                         0.00          0.00                         0.00
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>


<TABLE>
<CAPTION>

<S>                                                                                                          <C>
                OTHER REPORTING ITEMS:

                GROUP I PERCENTAGE                                                                           96.47%
                GROUP I PREPAYMENT PERCENTAGE                                                               100.00%
                GROUP II PERCENTAGE                                                                          96.60%
                GROUP II PREPAYMENT PERCENTAGE                                                              100.00%

                SUBORDINATE PRINCIPAL DISTRIBUTION AMOUNT                                                 21,814.69
                HAS THE CREDIT SUPPORT DEPLETION DATE OCCURRED                                                   No

                BANKRUPTCY AMOUNT                                                                        100,000.00
                FRAUD LOSS AMOUNT                                                                      5,343,511.64
                SPECIAL HAZARD AMOUNT                                                                  4,500,664.47
                EXTRAORDINARY LOSSES FOR THE PRIOR PERIOD                                                      0.00

                GROUP I EXTRAORDINARY LOSSES                                                                   0.00
                GROUP II EXTRAORDINARY LOSSES                                                                  0.00
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                          Page 5 of 5   (C) COPYRIGHT 1999 Bankers Trust Company


<PAGE>

                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1
                                     REMIC I
                         STATEMENT TO CERTIFICATEHOLDERS

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                                                     DISTRIBUTIONS IN DOLLARS
                                       PRIOR                                                                               CURRENT
                     ORIGINAL      PRINCIPAL                                                 REALIZED      DEFERRED      PRINCIPAL
     CLASS         FACE VALUE        BALANCE      INTEREST     PRINCIPAL          TOTAL        LOSSES      INTEREST        BALANCE
------------------------------------------------------------------------------------------------------------------------------------
<S>            <C>                <C>             <C>           <C>            <C>                   <C>        <C>  <C>
     P1-M           21,501.00          21,267.38          0.00         19.88          19.88          0.00       0.00      21,247.50
     P2-M          350,133.00         334,910.91          0.00      1,339.90       1,339.90          0.00       0.00     333,571.01
     X1-M *    142,084,361.67     104,383,874.87     45,880.10          0.00      45,880.10          0.00       0.00 102,435,799.10
     X2-M *    187,559,494.52     138,734,377.50     25,840.00          0.00      25,840.00          0.00       0.00 136,795,454.06
     Y1             71,698.81          50,385.80        283.42         25.78         309.20          0.00       0.00      50,360.02
     Y2             99,676.65          67,927.24        367.94          0.00         367.94          0.00       0.00      67,927.24
     Z1        143,556,266.44     105,857,355.16    595,447.62  1,949,547.08   2,544,994.70          0.00       0.00 103,907,808.08
     Z2        199,253,620.42     149,942,486.59    812,188.47  1,984,537.92   2,796,726.39          0.00       0.00 147,957,948.67
     R-I                50.00               0.00          0.00          0.00           0.00          0.00       0.00           0.00

------------------------------------------------------------------------------------------------------------------------------------
TOTALS         343,352,946.32     256,274,333.08  1,480,007.55  3,935,470.56   5,415,478.11          0.00       0.00 252,338,862.52
------------------------------------------------------------------------------------------------------------------------------------
  *Notional Class Balance
</TABLE>


<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                            FACTOR INFORMATION PER $1000 OF ORIGINAL FACE                                     PASS-THROUGH
                                       PRIOR                                                  CURRENT            RATES
                                   PRINCIPAL                                                PRINCIPAL
     CLASS          CUSIP            BALANCE      INTEREST     PRINCIPAL          TOTAL       BALANCE       CURRENT           NEXT
------------------------------------------------------------------------------------------------------------------------------------
<S>             <C>     <C>         <C>           <C>           <C>            <C>           <C>          <C>            <C>
     P1-M                         989.134459      0.000000      0.924608       0.924608    988.209851     0.000000%      0.000000%
     P2-M                         956.524835      0.000000      3.826832       3.826832    952.698003     0.000000%      0.000000%
     X1-M *                       734.661251      0.322907      0.000000       0.322907    720.950553     0.527439%      0.527439%
     X2-M *                       739.681976      0.137770      0.000000       0.137770    729.344331     0.223506%      0.223506%
     Y1                           702.742462      3.952966      0.359550       4.312516    702.382902     6.750000%      6.750000%
     Y2                           681.475963      3.691336      0.000000       3.691336    681.475963     6.500000%      6.500000%
     Z1                           737.392785      4.147834     13.580369      17.728203    723.812416     6.750000%      6.750000%
     Z2                           752.520764      4.076154      9.959859      14.036013    742.560905     6.500000%      6.500000%
     R-I        055240DQ5           0.000000      0.000000      0.000000       0.000000      0.000000     6.750000%      6.750000%

------------------------------------------------------------------------------------------------------------------------------------
SELLER:                                    Bank of America                      ADMINISTRATOR:               Kelly L. Shea
SERVICER:                                  Bank of America                                               Bankers Trust Company
LEAD UNDERWRITER:                    Donaldson, Lufkin & Jenrette                                             3 Park Plaza
RECORD DATE:                                April 30, 1999                                                  Irvine, CA 92614
DISTRIBUTION DATE:                           May 25, 1999                       FACTOR INFORMATION:          (800) 735-7777
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                          Page 1 of 5   (C) COPYRIGHT 1999 Bankers Trust Company


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1
                                    REMIC II
                         STATEMENT TO CERTIFICATEHOLDERS
<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                                                     DISTRIBUTIONS IN DOLLARS
                                         PRIOR                                                                               CURRENT
                     ORIGINAL        PRINCIPAL                                                 REALIZED      DEFERRED      PRINCIPAL
     CLASS         FACE VALUE          BALANCE      INTEREST     PRINCIPAL          TOTAL        LOSSES      INTEREST        BALANCE
------------------------------------------------------------------------------------------------------------------------------------
<S>            <C>              <C>             <C>           <C>            <C>                   <C>           <C>  <C>
     IA-1       96,101,504.00    58,419,443.34    328,609.37  1,946,212.81   2,274,822.18          0.00          0.00  56,473,230.53
     IA-2        5,000,000.00     5,000,000.00     28,125.00          0.00      28,125.00          0.00          0.00   5,000,000.00
     IA-3        9,500,000.00     9,500,000.00     53,437.50          0.00      53,437.50          0.00          0.00   9,500,000.00
     IA-4       14,250,000.00    14,250,000.00     80,156.25          0.00      80,156.25          0.00          0.00  14,250,000.00
     IA-5        4,887,000.00     4,887,000.00     27,489.38          0.00      27,489.38          0.00          0.00   4,887,000.00
     IA-6        9,939,000.00     9,939,000.00     55,906.88          0.00      55,906.88          0.00          0.00   9,939,000.00
     I-X *      11,983,709.00     8,156,461.73     45,880.10          0.00      45,880.10          0.00          0.00   7,982,900.06
     I-PO           21,501.00        21,267.38          0.00         19.88          19.88          0.00          0.00      21,247.50
     IIA-1     121,111,453.00    90,421,260.07    489,781.83  1,238,659.34   1,728,441.17          0.00          0.00  89,182,600.73
     IIA-2       1,000,000.00       639,696.90      3,465.02     13,956.52      17,421.54          0.00          0.00     625,740.38
     IIA-3       8,262,000.00     8,262,000.00     44,752.50          0.00      44,752.50          0.00          0.00   8,262,000.00
     IIA-4      14,913,749.00    14,340,324.52     77,676.76     52,161.72     129,838.48          0.00          0.00  14,288,162.80
     IIA-5      46,447,250.00    31,072,797.01    168,310.98    677,927.54     846,238.52          0.00          0.00  30,394,869.47
     IIA-6       2,127,000.00             0.00          0.00          0.00           0.00          0.00          0.00           0.00
     II-X *      7,513,508.12     4,770,461.78     25,840.00          0.00      25,840.00          0.00          0.00   4,666,809.34
     II-PO         350,133.00       334,910.91          0.00      1,339.90       1,339.90          0.00          0.00     333,571.01

------------------------------------------------------------------------------------------------------------------------------------
TOTALS         333,910,590.00   247,087,700.13  1,429,431.57  3,930,277.71   5,359,709.28          0.00          0.00 243,157,422.42
------------------------------------------------------------------------------------------------------------------------------------
*Notional Class Balance
</TABLE>

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                            FACTOR INFORMATION PER $1000 OF ORIGINAL FACE                                     PASS-THROUGH
                                       PRIOR                                                  CURRENT            RATES
                                   PRINCIPAL                                                PRINCIPAL
     CLASS          CUSIP            BALANCE      INTEREST     PRINCIPAL          TOTAL       BALANCE       CURRENT           NEXT
------------------------------------------------------------------------------------------------------------------------------------
<S>             <C>             <C>               <C>           <C>            <C>       <C>              <C>            <C>
     IA-1       055240CT0         607.893122      3.419399     20.251637      23.671036    587.641485     6.750000%      6.750000%
     IA-2       055240CU7       1,000.000000      5.625000      0.000000       5.625000  1,000.000000     6.750000%      6.750000%
     IA-3       055240CV5       1,000.000000      5.625000      0.000000       5.625000  1,000.000000     6.750000%      6.750000%
     IA-4       055240CW3       1,000.000000      5.625000      0.000000       5.625000  1,000.000000     6.750000%      6.750000%
     IA-5       055240CX1       1,000.000000      5.625001      0.000000       5.625001  1,000.000000     6.750000%      6.750000%
     IA-6       055240CY9       1,000.000000      5.625001      0.000000       5.625001  1,000.000000     6.750000%      6.750000%
     I-X *      055240DF9         680.629155      5.625000      0.000000       5.625000    666.146021     6.750000%      0.000000%
     I-PO       055240DH5         989.134459      0.000000      0.924608       0.924608    988.209851     0.000000%      6.500000%
     IIA-1      055240CZ6         746.595453      4.044059     10.227434      14.271492    736.368019     6.500000%      6.500000%
     IIA-2      055240DA0         639.696900      3.465020     13.956520      17.421540    625.740380     6.500000%      6.500000%
     IIA-3      055240DB8       1,000.000000      5.416667      0.000000       5.416667  1,000.000000     6.500000%      6.500000%
     IIA-4      055240DC6         961.550615      5.208399      3.497559       8.705959    958.053056     6.500000%      6.500000%
     IIA-5      055240DD4         668.991103      3.623702     14.595644      18.219346    654.395459     6.500000%      6.500000%
     IIA-6      055240DE2           0.000000      0.000000      0.000000       0.000000      0.000000     6.500000%      6.500000%
     II-X *     055240DG7         634.918031      3.439139      0.000000       3.439139    621.122552     6.500000%      0.000000%
     II-PO      055240DU6         956.524835      0.000000      3.826832       3.826832    952.698003     0.000000%      0.000000%

------------------------------------------------------------------------------------------------------------------------------------
SELLER:                                    Bank of America                      ADMINISTRATOR:               Kelly L. Shea
SERVICER:                                  Bank of America                                               Bankers Trust Company
LEAD UNDERWRITER:                    Donaldson, Lufkin & Jenrette                                             3 Park Plaza
RECORD DATE:                                April 30, 1999                                                  Irvine, CA 92614
DISTRIBUTION DATE:                           May 25, 1999                            FACTOR INFORMATION:     (800) 735-7777
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>

                          Page 2 of 5   (C) COPYRIGHT 1999 Bankers Trust Company


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1

                         STATEMENT TO CERTIFICATEHOLDERS

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                                                     DISTRIBUTIONS IN DOLLARS
                                       PRIOR                                                                               CURRENT
                     ORIGINAL      PRINCIPAL                                                 REALIZED      DEFERRED      PRINCIPAL
     CLASS         FACE VALUE        BALANCE      INTEREST     PRINCIPAL          TOTAL        LOSSES      INTEREST        BALANCE
------------------------------------------------------------------------------------------------------------------------------------
<S>              <C>            <C>              <C>            <C>           <C>                <C>           <C>    <C>
     M           3,776,882.00   3,674,652.68     20,230.39      2,077.14      22,307.53          0.00          0.00   3,672,575.54
     B-1         2,231,794.00   2,171,385.75     11,954.32      1,227.40      13,181.72          0.00          0.00   2,170,158.35
     B-2         1,201,735.00   1,169,207.50      6,436.94        660.91       7,097.85          0.00          0.00   1,168,546.59
     B-3         1,030,060.00   1,002,179.23      5,517.39        566.49       6,083.88          0.00          0.00   1,001,612.74
     B-4           515,029.00     501,088.63      2,758.69        283.25       3,041.94          0.00          0.00     500,805.38
     B-5           686,706.32     668,119.16      3,678.26        377.65       4,055.91          0.00          0.00     667,741.50
     R-II               50.00           0.00          0.00          0.00           0.00          0.00          0.00           0.00

------------------------------------------------------------------------------------------------------------------------------------
TOTALS           9,442,256.32   9,186,632.95     50,575.99      5,192.84      55,768.83          0.00          0.00   9,181,440.10
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>


<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                            FACTOR INFORMATION PER $1000 OF ORIGINAL FACE                                     PASS-THROUGH
                                       PRIOR                                                  CURRENT            RATES
                                   PRINCIPAL                                                PRINCIPAL
     CLASS          CUSIP            BALANCE      INTEREST     PRINCIPAL          TOTAL       BALANCE       CURRENT           NEXT
------------------------------------------------------------------------------------------------------------------------------------
<S>             <C>               <C>             <C>           <C>            <C>         <C>            <C>            <C>
     M          055240DJ1         972.932880      5.356373      0.549962       5.906335    972.382918     6.606467%      6.297017%
     B-1        055240DK8         972.932874      5.356372      0.549961       5.906334    972.382913     6.606467%      6.297017%
     B-2        055240DL6         972.932885      5.356372      0.549963       5.906335    972.382921     6.606467%      6.297017%
     B-3        055240DM4         972.932868      5.356377      0.549958       5.906336    972.382910     6.606467%      6.297017%
     B-4        055240DN2         972.932845      5.356378      0.549969       5.906347    972.382876     6.606467%      6.297017%
     B-5        055240DP7         972.932881      5.356380      0.549950       5.906330    972.382922     6.606467%      6.297017%
     R-II       055240DR3           0.000000      0.000000      0.000000       0.000000      0.000000     6.750000%      6.750000%

------------------------------------------------------------------------------------------------------------------------------------
SELLER:                                    Bank of America                      ADMINISTRATOR:               Kelly L. Shea
SERVICER:                                  Bank of America                                               Bankers Trust Company
LEAD UNDERWRITER:                    Donaldson, Lufkin & Jenrette                                             3 Park Plaza
RECORD DATE:                                April 30, 1999                                                  Irvine, CA 92614
DISTRIBUTION DATE:                           May 25, 1999                       FACTOR INFORMATION:          (800) 735-7777
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                          Page 3 of 5   (C) COPYRIGHT 1999 Bankers Trust Company


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1

                         STATEMENT TO CERTIFICATEHOLDERS
<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
Distribution Date:            May 25, 1999
------------------------------------------------------------------------------------------------------------------------------------

MORTGAGE POOL INFORMATION:                                                  GROUP I                     GROUP II
--------------------------                                                  -------                     --------

<S>                                                                      <C>                          <C>
                BEGINNING BALANCE OF POOL                                105,929,008.44               150,345,324.95
                LESS:         SCHEDULED PRINCIPAL                            (90,977.75)                (546,896.62)
                              PRINCIPAL PREPAYMENTS                       (1,858,614.99)              (1,438,981.20)
                              REPURCHASES                                          0.00                        0.00
                              LIQUIDATIONS                                         0.00                        0.00
                              OTHER UNSCHEDULED PRINCIPAL                          0.00                        0.00
                                                                         --------------               --------------
                ENDING BALANCE OF POOL                                   103,979,415.70               148,359,447.13
                                                                         ==============               ==============

                BEGINNING NUMBER OF LOANS IN POOL                                   334                         451
                ENDING NUMBER OF LOANS IN POOL                                      327                         446

                WEIGHTED AVERAGE REMAINING TERM TO MATURITY                         337                         163
                WEIGHTED AVERAGE NET CONTRACT RATE                            7.518390%                   7.080384%

                CURRENT REALIZED LOSSES ON THE POOL                                0.00                        0.00
                CUMULATIVE REALIZED LOSSES ON THE POOL                             0.00                        0.00

                BEGINNING POOL BALANCE OF PREMIUM LOANS                  104,383,874.87               138,734,377.50
                STRIPPED INTEREST RATE                                        0.527439%                   0.223506%
</TABLE>


<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
DELINQUENT, BANKRUPTCY,                                                                     LOANS         LOANS         LOANS
FORECLOSURE, AND REO                           30 TO 59      60 TO 89       90 PLUS          IN            IN             IN
LOAN INFORMATION                                 DAYS          DAYS           DAYS       BANKRUPTCY    FORECLOSURE       REO
------------------------------------------------------------------------------------------------------------------------------------
<S>                                             <C>              <C>            <C>           <C>           <C>            <C>
GROUP I         PRINCIPAL BALANCE               338,647.91          0.00           0.00          0.00          0.00           0.00
                     PERCENTAGE OF GROUP BAL.      0.1342%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
                NUMBER OF LOANS                          1             0              0             0             0              0
                     PERCENTAGE OF LOANS           0.1294%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
GROUP II        PRINCIPAL BALANCE                     0.00          0.00           0.00          0.00          0.00           0.00
                     PERCENTAGE OF GROUP BAL.      0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
                NUMBER OF LOANS                          0             0              0             0             0              0
                     PERCENTAGE OF LOANS           0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%

------------------------------------------------------------------------------------------------------------------------------------
                GROUP I BOOK VALUE OF REO PROPERTIES                                                             NA
                GROUP II BOOK VALUE OF REO PROPERTIES                                                            NA
</TABLE>


<TABLE>
<CAPTION>
SERVICING INFORMATION:                                                      GROUP I                     GROUP II
----------------------                                                      -------                     --------
<S>                                                                           <C>                         <C>
                SERVICING FEES ACCRUED DURING THE CURRENT DUE PERIOD          22,068.54                   48,689.12
                PLUS:         ADDITIONAL SERVICING COMPENSATION                    0.00                        0.00
                LESS:         AMTS. TO COVER PREPAYMENT INT. SHORTFALL        (5,698.57)                  (4,677.03)
                              DELINQUENT SERVICING FEES                       (2,038.35)                   3,001.70
                                                                         --------------               --------------
                SERVICING FEES COLLECTED FOR THE CURRENT DUE PERIOD           14,331.62                   47,013.79
                                                                         ==============               ==============
                ADVANCED PRINCIPAL                                             8,238.18                   33,605.06
                ADVANCED INTEREST                                             59,115.09                   51,633.11

------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                          Page 4 of 5   (C) COPYRIGHT 1999 Bankers Trust Company


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1

                         STATEMENT TO CERTIFICATEHOLDERS
<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
Distribution Date:            May 25, 1999
------------------------------------------------------------------------------------------------------------------------------------

                                                 OTHER                                   CUMULATIVE
                                PREPAYMENT    UNSCHEDULED                 CERTIFICATE      UNPAID                     CUMULATIVE
                                PRINCIPAL      PRINCIPAL                    INTEREST      INTEREST                     REALIZED
     CLASS                     DISTRIBUTED    DISTRIBUTED                  SHORTFALL      SHORTFALL                     LOSSES
------------------------------------------------------------------------------------------------------------------------------------
<S>                             <C>                   <C>                          <C>           <C>                          <C>
       CLASS IA-1               1,858,596.00          0.00                         0.00          0.00                         0.00
       CLASS IA-2                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-3                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-4                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-5                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-6                       0.00          0.00                         0.00          0.00                         0.00
       CLASS I-X                        0.00          0.00                         0.00          0.00                         0.00
       CLASS I-PO                      18.99          0.00                         0.00          0.00                         0.00
       CLASS IIA-1                898,370.49          0.00                         0.00          0.00                         0.00
       CLASS IIA-2                 10,122.34          0.00                         0.00          0.00                         0.00
       CLASS IIA-3                      0.00          0.00                         0.00          0.00                         0.00
       CLASS IIA-4                 37,831.67          0.00                         0.00          0.00                         0.00
       CLASS IIA-5                491,684.90          0.00                         0.00          0.00                         0.00
       CLASS IIA-6                      0.00          0.00                         0.00          0.00                         0.00
       CLASS II-X                       0.00          0.00                         0.00          0.00                         0.00
       CLASS II-PO                    971.80          0.00                         0.00          0.00                         0.00
       CLASS M                          0.00          0.00                         0.00          0.00                         0.00
       CLASS B-1                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-2                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-3                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-4                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-5                        0.00          0.00                         0.00          0.00                         0.00

------------------------------------------------------------------------------------------------------------------------------------
    TOTALS                      3,297,596.19          0.00                         0.00          0.00                         0.00
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>


<TABLE>
<CAPTION>

<S>                                                                                                          <C>
                OTHER REPORTING ITEMS:


                GROUP I PERCENTAGE                                                                           96.31%
                GROUP I PREPAYMENT PERCENTAGE                                                               100.00%
                GROUP II PERCENTAGE                                                                          99.66%
                GROUP II PREPAYMENT PERCENTAGE                                                              100.00%

                SUBORDINATE PRINCIPAL DISTRIBUTION AMOUNT                                                  5,192.85
                HAS THE CREDIT SUPPORT DEPLETION DATE OCCURRED                                                   No

                BANKRUPTCY AMOUNT                                                                        100,000.00
                FRAUD LOSS AMOUNT                                                                        119,926.36
                SPECIAL HAZARD AMOUNT                                                                  4,500,664.47
                EXTRAORDINARY LOSSES FOR THE PRIOR PERIOD                                                      0.00

                GROUP I EXTRAORDINARY LOSSES                                                                   0.00
                GROUP II EXTRAORDINARY LOSSES                                                                  0.00

------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                          Page 5 of 5   (C) COPYRIGHT 1999 Bankers Trust Company


<PAGE>

                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1
                                     REMIC I
                         STATEMENT TO CERTIFICATEHOLDERS

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                                                     DISTRIBUTIONS IN DOLLARS

                                       PRIOR                                                                               CURRENT
                     ORIGINAL      PRINCIPAL                                                 REALIZED      DEFERRED      PRINCIPAL
     CLASS         FACE VALUE        BALANCE      INTEREST     PRINCIPAL          TOTAL        LOSSES      INTEREST        BALANCE
------------------------------------------------------------------------------------------------------------------------------------
<S>            <C>                <C>             <C>           <C>            <C>                   <C>        <C>  <C>
     P1-M           21,501.00          21,247.50          0.00         20.15          20.15          0.00       0.00      21,227.35
     P2-M          350,133.00         333,571.01          0.00      1,357.75       1,357.75          0.00       0.00     332,213.26
     X1-M *    142,084,361.67     102,435,799.10     44,903.81          0.00      44,903.81          0.00       0.00  99,058,930.40
     X2-M *    187,559,494.52     136,795,454.06     25,278.55          0.00      25,278.55          0.00       0.00 132,464,622.26
     Y1             71,698.81          50,360.02        283.29      1,759.41       2,042.70          0.00       0.00      48,600.61
     Y2             99,676.65          67,927.24        367.94      2,344.24       2,712.18          0.00       0.00      65,583.00
     Z1        143,556,266.44     103,907,808.08    584,481.42  3,376,714.83   3,961,196.25          0.00       0.00 100,531,093.25
     Z2        199,253,620.42     147,957,948.67    801,438.89  4,374,118.23   5,175,557.12          0.00       0.00 143,583,830.44
     R-I                50.00               0.00          0.00          0.00           0.00          0.00       0.00           0.00

------------------------------------------------------------------------------------------------------------------------------------
TOTALS         343,352,946.32     252,338,862.52  1,456,753.90  7,756,314.61   9,213,068.51          0.00       0.00 244,582,547.91
------------------------------------------------------------------------------------------------------------------------------------
  *Notional Class Balance
</TABLE>

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                            FACTOR INFORMATION PER $1000 OF ORIGINAL FACE                                     PASS-THROUGH
                                       PRIOR                                                  CURRENT            RATES
                                   PRINCIPAL                                                PRINCIPAL
     CLASS          CUSIP            BALANCE      INTEREST     PRINCIPAL          TOTAL       BALANCE       CURRENT           NEXT
------------------------------------------------------------------------------------------------------------------------------------
<S>             <C>                 <C>           <C>           <C>            <C>           <C>          <C>            <C>
     P1-M                         988.209851      0.000000      0.937166       0.937166    987.272685     0.000000%      0.000000%
     P2-M                         952.698003      0.000000      3.877812       3.877812    948.820191     0.000000%      0.000000%
     X1-M *                       720.950553      0.316036      0.000000       0.316036    697.183907     0.526033%      0.526033%
     X2-M *                       729.344331      0.134776      0.000000       0.134776    706.253888     0.221749%      0.221749%
     Y1                           702.382902      3.951153     24.538902      28.490055    677.844002     6.750000%      6.750000%
     Y2                           681.475963      3.691336     23.518430      27.209766    657.957515     6.500000%      6.500000%
     Z1                           723.812416      4.071445     23.521891      27.593336    700.290525     6.750000%      6.750000%
     Z2                           742.560905      4.022205     21.952516      25.974721    720.608389     6.500000%      6.500000%
     R-I        055240DQ5           0.000000      0.000000      0.000000       0.000000      0.000000     6.750000%      6.750000%

------------------------------------------------------------------------------------------------------------------------------------
SELLER:                                    Bank of America                      ADMINISTRATOR:               Kelly L. Shea
SERVICER:                                  Bank of America                                               Bankers Trust Company
LEAD UNDERWRITER:                    Donaldson, Lufkin & Jenrette                                             3 Park Plaza
RECORD DATE:                                 May 28, 1999                                                   Irvine, CA 92614
DISTRIBUTION DATE:                          June 25, 1999                            FACTOR INFORMATION:     (800) 735-7777
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                          Page 1 of 5   (C) COPYRIGHT 1999 Bankers Trust Company


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1
                                    REMIC II
                         STATEMENT TO CERTIFICATEHOLDERS


<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                                                     DISTRIBUTIONS IN DOLLARS
                                         PRIOR                                                                               CURRENT
                     ORIGINAL        PRINCIPAL                                                 REALIZED      DEFERRED      PRINCIPAL
     CLASS         FACE VALUE          BALANCE      INTEREST     PRINCIPAL          TOTAL        LOSSES      INTEREST        BALANCE
------------------------------------------------------------------------------------------------------------------------------------
<S>            <C>              <C>             <C>           <C>            <C>                   <C>           <C>  <C>
     IA-1       96,101,504.00    56,473,230.53    317,661.92  3,375,131.56   3,692,793.48          0.00          0.00  53,098,098.97
     IA-2        5,000,000.00     5,000,000.00     28,125.00          0.00      28,125.00          0.00          0.00   5,000,000.00
     IA-3        9,500,000.00     9,500,000.00     53,437.50          0.00      53,437.50          0.00          0.00   9,500,000.00
     IA-4       14,250,000.00    14,250,000.00     80,156.25          0.00      80,156.25          0.00          0.00  14,250,000.00
     IA-5        4,887,000.00     4,887,000.00     27,489.38          0.00      27,489.38          0.00          0.00   4,887,000.00
     IA-6        9,939,000.00     9,939,000.00     55,906.88          0.00      55,906.88          0.00          0.00   9,939,000.00
     I-X *      11,983,709.00     7,982,900.06     44,903.82          0.00      44,903.82          0.00          0.00   7,668,152.37
     I-PO           21,501.00        21,247.50          0.00         20.15          20.15          0.00          0.00      21,227.35
     IIA-1     121,111,453.00    89,182,600.73    483,072.42  2,732,750.93   3,215,823.35          0.00          0.00  86,449,849.80
     IIA-2       1,000,000.00       625,740.38      3,389.43     32,072.61      35,462.04          0.00          0.00     593,667.77
     IIA-3       8,262,000.00     8,262,000.00     44,752.50          0.00      44,752.50          0.00          0.00   8,262,000.00
     IIA-4      14,913,749.00    14,288,162.80     77,394.22     51,550.77     128,944.99          0.00          0.00  14,236,612.03
     IIA-5      46,447,250.00    30,394,869.47    164,638.88  1,557,902.86   1,722,541.74          0.00          0.00  28,836,966.61
     IIA-6       2,127,000.00             0.00          0.00          0.00           0.00          0.00          0.00           0.00
     II-X *      7,513,508.12     4,666,809.34     25,278.55          0.00      25,278.55          0.00          0.00   4,453,953.48
     II-PO         350,133.00       333,571.01          0.00      1,357.75       1,357.75          0.00          0.00     332,213.26

------------------------------------------------------------------------------------------------------------------------------------
TOTALS         333,910,590.00   243,157,422.42  1,406,206.75  7,750,786.62   9,156,993.37          0.00          0.00 235,406,635.79
------------------------------------------------------------------------------------------------------------------------------------
  *Notional Class Balance
</TABLE>


<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                            FACTOR INFORMATION PER $1000 OF ORIGINAL FACE                                     PASS-THROUGH
                                       PRIOR                                                  CURRENT            RATES
                                   PRINCIPAL                                                PRINCIPAL
     CLASS          CUSIP            BALANCE      INTEREST     PRINCIPAL          TOTAL       BALANCE       CURRENT           NEXT
------------------------------------------------------------------------------------------------------------------------------------
<S>             <C>             <C>               <C>           <C>            <C>       <C>              <C>            <C>
     IA-1       055240CT0         587.641485      3.305483     35.120486      38.425970    552.520999     6.750000%      6.750000%
     IA-2       055240CU7       1,000.000000      5.625000      0.000000       5.625000  1,000.000000     6.750000%      6.750000%
     IA-3       055240CV5       1,000.000000      5.625000      0.000000       5.625000  1,000.000000     6.750000%      6.750000%
     IA-4       055240CW3       1,000.000000      5.625000      0.000000       5.625000  1,000.000000     6.750000%      6.750000%
     IA-5       055240CX1       1,000.000000      5.625001      0.000000       5.625001  1,000.000000     6.750000%      6.750000%
     IA-6       055240CY9       1,000.000000      5.625001      0.000000       5.625001  1,000.000000     6.750000%      6.750000%
     I-X *      055240DF9         666.146021      5.625001      0.000000       5.625001    639.881390     6.750000%      0.000000%
     I-PO       055240DH5         988.209851      0.000000      0.937166       0.937166    987.272685     0.000000%      6.500000%
     IIA-1      055240CZ6         736.368019      3.988660     22.563935      26.552595    713.804084     6.500000%      6.500000%
     IIA-2      055240DA0         625.740380      3.389430     32.072610      35.462040    593.667770     6.500000%      6.500000%
     IIA-3      055240DB8       1,000.000000      5.416667      0.000000       5.416667  1,000.000000     6.500000%      6.500000%
     IIA-4      055240DC6         958.053056      5.189454      3.456593       8.646048    954.596462     6.500000%      6.500000%
     IIA-5      055240DD4         654.395459      3.544642     33.541337      37.085979    620.854122     6.500000%      6.500000%
     IIA-6      055240DE2           0.000000      0.000000      0.000000       0.000000      0.000000     6.500000%      6.500000%
     II-X *     055240DG7         621.122552      3.364414      0.000000       3.364414    592.792795     6.500000%      0.000000%
     II-PO      055240DU6         952.698003      0.000000      3.877812       3.877812    948.820191     0.000000%      0.000000%


------------------------------------------------------------------------------------------------------------------------------------
SELLER:                                    Bank of America                      ADMINISTRATOR:               Kelly L. Shea
SERVICER:                                  Bank of America                                               Bankers Trust Company
LEAD UNDERWRITER:                    Donaldson, Lufkin & Jenrette                                             3 Park Plaza
RECORD DATE:                                 May 28, 1999                                                   Irvine, CA 92614
DISTRIBUTION DATE:                          June 25, 1999                            FACTOR INFORMATION:     (800) 735-7777
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                          Page 2 of 5   (C) COPYRIGHT 1999 Bankers Trust Company


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1
                         STATEMENT TO CERTIFICATEHOLDERS

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                                                     DISTRIBUTIONS IN DOLLARS
                                       PRIOR                                                                               CURRENT
                     ORIGINAL      PRINCIPAL                                                 REALIZED      DEFERRED      PRINCIPAL
     CLASS         FACE VALUE        BALANCE      INTEREST     PRINCIPAL          TOTAL        LOSSES      INTEREST        BALANCE
------------------------------------------------------------------------------------------------------------------------------------
<S>              <C>            <C>              <C>            <C>           <C>                <C>           <C>    <C>
     M           3,776,882.00   3,672,575.54     20,218.86      2,211.20      22,430.06          0.00          0.00   3,670,364.34
     B-1         2,231,794.00   2,170,158.35     11,947.51      1,306.62      13,254.13          0.00          0.00   2,168,851.73
     B-2         1,201,735.00   1,168,546.59      6,433.27        703.56       7,136.83          0.00          0.00   1,167,843.03
     B-3         1,030,060.00   1,001,612.74      5,514.24        603.05       6,117.29          0.00          0.00   1,001,009.69
     B-4           515,029.00     500,805.38      2,757.12        301.53       3,058.65          0.00          0.00     500,503.85
     B-5           686,706.32     667,741.50      3,676.16        402.02       4,078.18          0.00          0.00     667,339.48
     R-II               50.00           0.00          0.00          0.00           0.00          0.00          0.00           0.00

------------------------------------------------------------------------------------------------------------------------------------
TOTALS           9,442,256.32   9,181,440.10     50,547.16      5,527.98      56,075.14          0.00          0.00   9,175,912.12
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>


<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                            FACTOR INFORMATION PER $1000 OF ORIGINAL FACE                                     PASS-THROUGH
                                       PRIOR                                                  CURRENT            RATES
                                   PRINCIPAL                                                PRINCIPAL
     CLASS          CUSIP            BALANCE      INTEREST     PRINCIPAL          TOTAL       BALANCE       CURRENT           NEXT
------------------------------------------------------------------------------------------------------------------------------------
<S>             <C>               <C>             <C>           <C>            <C>         <C>            <C>            <C>
     M          055240DJ1         972.382918      5.353321      0.585456       5.938777    971.797462     6.606436%      6.312432%
     B-1        055240DK8         972.382913      5.353321      0.585457       5.938778    971.797455     6.606436%      6.312432%
     B-2        055240DL6         972.382921      5.353318      0.585454       5.938772    971.797468     6.606436%      6.312432%
     B-3        055240DM4         972.382910      5.353319      0.585451       5.938771    971.797458     6.606436%      6.312432%
     B-4        055240DN2         972.382876      5.353330      0.585462       5.938792    971.797413     6.606436%      6.312432%
     B-5        055240DP7         972.382922      5.353322      0.585435       5.938757    971.797490     6.606436%      6.312432%
     R-II       055240DR3           0.000000      0.000000      0.000000       0.000000      0.000000     6.750000%      6.750000%

------------------------------------------------------------------------------------------------------------------------------------
SELLER:                                    Bank of America                      ADMINISTRATOR:               Kelly L. Shea
SERVICER:                                  Bank of America                                               Bankers Trust Company
LEAD UNDERWRITER:                    Donaldson, Lufkin & Jenrette                                             3 Park Plaza
RECORD DATE:                                 May 28, 1999                                                   Irvine, CA 92614
DISTRIBUTION DATE:                          June 25, 1999                       FACTOR INFORMATION:          (800) 735-7777
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                          Page 3 of 5   (C) COPYRIGHT 1999 Bankers Trust Company


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1
                         STATEMENT TO CERTIFICATEHOLDERS


<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
Distribution Date:            June 25, 1999
------------------------------------------------------------------------------------------------------------------------------------


MORTGAGE POOL INFORMATION:                                                  GROUP I                     GROUP II
--------------------------                                                  -------                     --------

<S>                                                                      <C>                          <C>
                BEGINNING BALANCE OF POOL                                103,979,415.70               148,359,447.13
                LESS:         SCHEDULED PRINCIPAL                            (88,918.65)                (535,321.45)
                              PRINCIPAL PREPAYMENTS                       (3,289,575.75)              (3,842,498.76)
                              REPURCHASES                                          0.00                        0.00
                              LIQUIDATIONS                                         0.00                        0.00
                              OTHER UNSCHEDULED PRINCIPAL                          0.00                        0.00
                                                                         --------------               --------------
                ENDING BALANCE OF POOL                                   100,600,921.30               143,981,626.92
                                                                         ==============               ==============

                BEGINNING NUMBER OF LOANS IN POOL                                   327                         446
                ENDING NUMBER OF LOANS IN POOL                                      315                         435

                WEIGHTED AVERAGE REMAINING TERM TO MATURITY                         336                         162
                WEIGHTED AVERAGE NET CONTRACT RATE                            7.516844%                   7.077799%

                CURRENT REALIZED LOSSES ON THE POOL                                0.00                        0.00
                CUMULATIVE REALIZED LOSSES ON THE POOL                             0.00                        0.00

                BEGINNING POOL BALANCE OF PREMIUM LOANS                  102,435,799.10               136,795,454.06
                STRIPPED INTEREST RATE                                        0.526033%                   0.221749%
</TABLE>

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
DELINQUENT, BANKRUPTCY,                                                                     LOANS         LOANS         LOANS
FORECLOSURE, AND REO                           30 TO 59      60 TO 89       90 PLUS          IN            IN             IN
LOAN INFORMATION                                 DAYS          DAYS           DAYS       BANKRUPTCY    FORECLOSURE       REO
------------------------------------------------------------------------------------------------------------------------------------
<S>                                                <C>           <C>            <C>           <C>           <C>            <C>
GROUP I         PRINCIPAL BALANCE                     0.00          0.00           0.00          0.00          0.00           0.00
                     PERCENTAGE OF GROUP BAL.      0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
                NUMBER OF LOANS                          0             0              0             0             0              0
                     PERCENTAGE OF LOANS           0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
GROUP II        PRINCIPAL BALANCE                     0.00          0.00           0.00          0.00          0.00           0.00
                     PERCENTAGE OF GROUP BAL.      0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
                NUMBER OF LOANS                          0             0              0             0             0              0
                     PERCENTAGE OF LOANS           0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%

------------------------------------------------------------------------------------------------------------------------------------
                GROUP I BOOK VALUE OF REO PROPERTIES                                                             NA
                GROUP II BOOK VALUE OF REO PROPERTIES                                                            NA
</TABLE>


<TABLE>
<CAPTION>
SERVICING INFORMATION:                                                      GROUP I                     GROUP II
----------------------                                                      -------                     --------

<S>                                                                           <C>                         <C>
                SERVICING FEES ACCRUED DURING THE CURRENT DUE PERIOD          21,662.37                   47,963.29
                PLUS:         ADDITIONAL SERVICING COMPENSATION                    0.00                        0.00
                LESS:         AMTS. TO COVER PREPAYMENT INT. SHORTFALL        (7,736.93)                 (10,294.50)
                              DELINQUENT SERVICING FEES                       (1,479.00)                   2,774.37
                                                                         --------------               --------------
                SERVICING FEES COLLECTED FOR THE CURRENT DUE PERIOD           12,446.44                   40,443.16
                                                                         ==============               ==============

                ADVANCED PRINCIPAL                                             6,111.14                   29,968.90
                ADVANCED INTEREST                                             42,757.33                   46,224.94
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                            Page 4 of 5 (C) COPYRIGHT 1999 Bankers Trust Company


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1

                         STATEMENT TO CERTIFICATEHOLDERS

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
Distribution Date:            June 25, 1999
------------------------------------------------------------------------------------------------------------------------------------


------------------------------------------------------------------------------------------------------------------------------------
                                                 OTHER                                   CUMULATIVE
                                PREPAYMENT    UNSCHEDULED                 CERTIFICATE      UNPAID                     CUMULATIVE
                                PRINCIPAL      PRINCIPAL                    INTEREST      INTEREST                     REALIZED
     CLASS                     DISTRIBUTED    DISTRIBUTED                  SHORTFALL      SHORTFALL                     LOSSES
------------------------------------------------------------------------------------------------------------------------------------

<S>                             <C>                   <C>                          <C>           <C>                          <C>
       CLASS IA-1               3,289,556.11          0.00                         0.00          0.00                         0.00
       CLASS IA-2                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-3                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-4                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-5                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-6                       0.00          0.00                         0.00          0.00                         0.00
       CLASS I-X                        0.00          0.00                         0.00          0.00                         0.00
       CLASS I-PO                      19.64          0.00                         0.00          0.00                         0.00
       CLASS IIA-1              2,399,787.06          0.00                         0.00          0.00                         0.00
       CLASS IIA-2                 28,164.82          0.00                         0.00          0.00                         0.00
       CLASS IIA-3                      0.00          0.00                         0.00          0.00                         0.00
       CLASS IIA-4                 45,269.72          0.00                         0.00          0.00                         0.00
       CLASS IIA-5              1,368,084.84          0.00                         0.00          0.00                         0.00
       CLASS IIA-6                      0.00          0.00                         0.00          0.00                         0.00
       CLASS II-X                       0.00          0.00                         0.00          0.00                         0.00
       CLASS II-PO                  1,192.32          0.00                         0.00          0.00                         0.00
       CLASS M                          0.00          0.00                         0.00          0.00                         0.00
       CLASS B-1                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-2                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-3                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-4                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-5                        0.00          0.00                         0.00          0.00                         0.00
------------------------------------------------------------------------------------------------------------------------------------
    TOTALS                      7,132,074.51          0.00                         0.00          0.00                         0.00
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>

<S>                                                                                                          <C>
                OTHER REPORTING ITEMS:

                GROUP I PERCENTAGE                                                                           96.24%
                GROUP I PREPAYMENT PERCENTAGE                                                               100.00%
                GROUP II PERCENTAGE                                                                          99.59%
                GROUP II PREPAYMENT PERCENTAGE                                                              100.00%

                SUBORDINATE PRINCIPAL DISTRIBUTION AMOUNT                                                  5,527.99
                HAS THE CREDIT SUPPORT DEPLETION DATE OCCURRED                                                   No

                BANKRUPTCY AMOUNT                                                                        100,000.00
                FRAUD LOSS AMOUNT                                                                        119,926.36
                SPECIAL HAZARD AMOUNT                                                                  4,500,664.47
                EXTRAORDINARY LOSSES FOR THE PRIOR PERIOD                                                      0.00

                GROUP I EXTRAORDINARY LOSSES                                                                   0.00
                GROUP II EXTRAORDINARY LOSSES                                                                  0.00

------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                          Page 5 of 5   (C) COPYRIGHT 1999 Bankers Trust Company


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1
                                     REMIC I
                         STATEMENT TO CERTIFICATEHOLDERS


<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                                                     DISTRIBUTIONS IN DOLLARS
                                           PRIOR                                                                            CURRENT
                     ORIGINAL          PRINCIPAL                                                 REALIZED   DEFERRED      PRINCIPAL
     CLASS         FACE VALUE            BALANCE      INTEREST     PRINCIPAL          TOTAL        LOSSES   INTEREST        BALANCE
------------------------------------------------------------------------------------------------------------------------------------
<S>             <C>               <C>             <C>           <C>            <C>                   <C>        <C>  <C>
     P1-M           21,501.00          21,227.35          0.00         20.11          20.11          0.00       0.00      21,207.24
     P2-M          350,133.00         332,213.26          0.00      1,311.23       1,311.23          0.00       0.00     330,902.03
     X1-M *    142,084,361.67      99,058,930.40     43,133.36          0.00      43,133.36          0.00       0.00  97,236,268.85
     X2-M *    187,559,494.52     132,464,622.26     24,125.58          0.00      24,125.58          0.00       0.00 130,633,579.04
     Y1             71,698.81          48,600.61        273.54        134.93         408.47          0.00       0.00      48,465.68
     Y2             99,676.65          65,583.00        351.92      1,212.44       1,564.36          0.00       0.00      64,370.56
     Z1        143,556,266.44     100,531,093.25    565,487.26  1,824,041.57   2,389,528.83          0.00       0.00  98,707,051.68
     Z2        199,253,620.42     143,583,830.44    777,749.07  1,874,404.30   2,652,153.37          0.00       0.00 141,709,426.14
     R-I                50.00               0.00          0.00          0.00           0.00          0.00       0.00           0.00


------------------------------------------------------------------------------------------------------------------------------------
TOTALS          343,352,946.32    244,582,547.91  1,411,120.73  3,701,124.58   5,112,245.31          0.00       0.00 240,881,423.33
------------------------------------------------------------------------------------------------------------------------------------
  *Notional Class Balance
</TABLE>

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                            FACTOR INFORMATION PER $1000 OF ORIGINAL FACE                                     PASS-THROUGH
                                       PRIOR                                                  CURRENT            RATES
                                   PRINCIPAL                                                PRINCIPAL
     CLASS          CUSIP            BALANCE      INTEREST     PRINCIPAL          TOTAL       BALANCE       CURRENT           NEXT
------------------------------------------------------------------------------------------------------------------------------------
<S>             <C>                 <C>           <C>           <C>            <C>           <C>          <C>            <C>
     P1-M                         987.272685      0.000000      0.935305       0.935305    986.337380     0.000000%      0.000000%
     P2-M                         948.820191      0.000000      3.744948       3.744948    945.075243     0.000000%      0.000000%
     X1-M *                       697.183907      0.303576      0.000000       0.303576    684.355883     0.522518%      0.522518%
     X2-M *                       706.253888      0.128629      0.000000       0.128629    696.491422     0.218554%      0.218554%
     Y1                           677.844002      3.815126      1.881894       5.697020    675.962102     6.750000%      6.750000%
     Y2                           657.957515      3.530616     12.163764      15.694380    645.793784     6.500000%      6.500000%
     Z1                           700.290525      3.939133     12.706109      16.645242    687.584416     6.750000%      6.750000%
     Z2                           720.608389      3.903312      9.407128      13.310440    711.201261     6.500000%      6.500000%
     R-I        055240DQ5           0.000000      0.000000      0.000000       0.000000      0.000000     6.750000%      6.750000%


------------------------------------------------------------------------------------------------------------------------------------
SELLER:                                    Bank of America                      ADMINISTRATOR:               Kelly L. Shea
SERVICER:                                  Bank of America                                               Bankers Trust Company
LEAD UNDERWRITER:                    Donaldson, Lufkin & Jenrette                                             3 Park Plaza
RECORD DATE:                                June 30, 1999                                                   Irvine, CA 92614
DISTRIBUTION DATE:                          July 26, 1999                            FACTOR INFORMATION:     (800) 735-7777
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                          Page 1 of 5   (C) COPYRIGHT 1999 Bankers Trust Company


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1
                                    REMIC II
                         STATEMENT TO CERTIFICATEHOLDERS

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                                                     DISTRIBUTIONS IN DOLLARS
                                       PRIOR                                                                               CURRENT
                     ORIGINAL      PRINCIPAL                                                 REALIZED      DEFERRED      PRINCIPAL
     CLASS         FACE VALUE        BALANCE      INTEREST     PRINCIPAL          TOTAL        LOSSES      INTEREST        BALANCE
------------------------------------------------------------------------------------------------------------------------------------
<S>            <C>            <C>             <C>           <C>            <C>                   <C>           <C>  <C>
     IA-1       96,101,504.00  53,098,098.97    298,676.82  1,820,776.99   2,119,453.81          0.00          0.00  51,277,321.98
     IA-2        5,000,000.00   5,000,000.00     28,125.00          0.00      28,125.00          0.00          0.00   5,000,000.00
     IA-3        9,500,000.00   9,500,000.00     53,437.50          0.00      53,437.50          0.00          0.00   9,500,000.00
     IA-4       14,250,000.00  14,250,000.00     80,156.25          0.00      80,156.25          0.00          0.00  14,250,000.00
     IA-5        4,887,000.00   4,887,000.00     27,489.40          0.00      27,489.40          0.00          0.00   4,887,000.00
     IA-6        9,939,000.00   9,939,000.00     55,906.89          0.00      55,906.89          0.00          0.00   9,939,000.00
     I-X *      11,983,709.00   7,668,152.37     43,133.32          0.00      43,133.32          0.00          0.00   7,535,131.36
     I-PO           21,501.00      21,227.35          0.00         20.11          20.11          0.00          0.00      21,207.24
     IIA-1     121,111,453.00  86,449,849.80    468,444.23  1,138,305.72   1,606,749.95          0.00          0.00  85,311,544.08
     IIA-2       1,000,000.00     593,667.77      3,233.33     12,380.02      15,613.35          0.00          0.00     581,287.75
     IIA-3       8,262,000.00   8,262,000.00     44,752.50          0.00      44,752.50          0.00          0.00   8,262,000.00
     IIA-4      14,913,749.00  14,236,612.03     76,345.59     70,034.23     146,379.82          0.00          0.00  14,166,577.80
     IIA-5      46,447,250.00  28,836,966.61    156,964.28    601,350.48     758,314.76          0.00          0.00  28,235,616.13
     IIA-6       2,127,000.00           0.00          0.00          0.00           0.00          0.00          0.00           0.00
     II-X *      7,513,508.12   4,453,953.48     24,125.58          0.00      24,125.58          0.00          0.00   4,386,480.15
     II-PO         350,133.00     332,213.26          0.00      1,311.23       1,311.23          0.00          0.00     330,902.03

------------------------------------------------------------------------------------------------------------------------------------
TOTALS         333,910,590.00 235,406,635.79  1,360,790.69  3,644,178.78   5,004,969.47          0.00          0.00 231,762,457.01
------------------------------------------------------------------------------------------------------------------------------------
  *Notional Class Balance
</TABLE>

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                            FACTOR INFORMATION PER $1000 OF ORIGINAL FACE                                     PASS-THROUGH
                                       PRIOR                                                  CURRENT            RATES
                                   PRINCIPAL                                                PRINCIPAL
     CLASS          CUSIP            BALANCE      INTEREST     PRINCIPAL          TOTAL       BALANCE       CURRENT           NEXT
------------------------------------------------------------------------------------------------------------------------------------
<S>             <C>               <C>             <C>          <C>            <C>          <C>            <C>            <C>
     IA-1       055240CT0         552.520999      3.107931     18.946394      22.054325    533.574604     6.750000%      6.750000%
     IA-2       055240CU7       1,000.000000      5.625000      0.000000       5.625000  1,000.000000     6.750000%      6.750000%
     IA-3       055240CV5       1,000.000000      5.625000      0.000000       5.625000  1,000.000000     6.750000%      6.750000%
     IA-4       055240CW3       1,000.000000      5.625000      0.000000       5.625000  1,000.000000     6.750000%      6.750000%
     IA-5       055240CX1       1,000.000000      5.625005      0.000000       5.625005  1,000.000000     6.750000%      6.750000%
     IA-6       055240CY9       1,000.000000      5.625002      0.000000       5.625002  1,000.000000     6.750000%      6.750000%
     I-X *      055240DF9         639.881390      5.624995      0.000000       5.624995    628.781236     6.750000%      0.000000%
     I-PO       055240DH5         987.272685      0.000000      0.935305       0.935305    986.337380     0.000000%      6.500000%
     IIA-1      055240CZ6         713.804084      3.867877      9.398828      13.266705    704.405256     6.500000%      6.500000%
     IIA-2      055240DA0         593.667770      3.233330     12.380020      15.613350    581.287750     6.500000%      6.500000%
     IIA-3      055240DB8       1,000.000000      5.416667      0.000000       5.416667  1,000.000000     6.500000%      6.500000%
     IIA-4      055240DC6         954.596462      5.119141      4.695951       9.815092    949.900511     6.500000%      6.500000%
     IIA-5      055240DD4         620.854122      3.379410     12.946956      16.326365    607.907166     6.500000%      6.500000%
     IIA-6      055240DE2           0.000000      0.000000      0.000000       0.000000      0.000000     6.500000%      6.500000%
     II-X *     055240DG7         592.792795      3.210961      0.000000       3.210961    583.812526     6.500000%      0.000000%
     II-PO      055240DU6         948.820191      0.000000      3.744948       3.744948    945.075243     0.000000%      0.000000%



------------------------------------------------------------------------------------------------------------------------------------
SELLER:                                    Bank of America                      ADMINISTRATOR:               Kelly L. Shea
SERVICER:                                  Bank of America                                               Bankers Trust Company
LEAD UNDERWRITER:                    Donaldson, Lufkin & Jenrette                                             3 Park Plaza
RECORD DATE:                                June 30, 1999                                                   Irvine, CA 92614
DISTRIBUTION DATE:                          July 26, 1999                       FACTOR INFORMATION:          (800) 735-7777
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                          Page 2 of 5   (C) COPYRIGHT 1999 Bankers Trust Company


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1
                         STATEMENT TO CERTIFICATEHOLDERS

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                                                     DISTRIBUTIONS IN DOLLARS
                                       PRIOR                                                                               CURRENT
                     ORIGINAL      PRINCIPAL                                                 REALIZED      DEFERRED      PRINCIPAL
     CLASS         FACE VALUE        BALANCE      INTEREST     PRINCIPAL          TOTAL        LOSSES      INTEREST        BALANCE
------------------------------------------------------------------------------------------------------------------------------------
<S>              <C>            <C>              <C>           <C>            <C>                <C>           <C>    <C>
     M           3,776,882.00   3,670,364.34     20,095.07     22,778.30      42,873.37          0.00          0.00   3,647,586.04
     B-1         2,231,794.00   2,168,851.73     11,874.35     13,459.91      25,334.26          0.00          0.00   2,155,391.82
     B-2         1,201,735.00   1,167,843.03      6,393.89      7,247.64      13,641.53          0.00          0.00   1,160,595.39
     B-3         1,030,060.00   1,001,009.69      5,480.48      6,212.29      11,692.77          0.00          0.00     994,797.40
     B-4           515,029.00     500,503.85      2,740.23      3,106.12       5,846.35          0.00          0.00     497,397.73
     B-5           686,706.32     667,339.48      3,653.65      4,141.54       7,795.19          0.00          0.00     663,197.94
     R-II               50.00           0.00          0.00          0.00           0.00          0.00          0.00           0.00


------------------------------------------------------------------------------------------------------------------------------------
TOTALS           9,442,256.32   9,175,912.12     50,237.67     56,945.80     107,183.47          0.00          0.00   9,118,966.32
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                            FACTOR INFORMATION PER $1000 OF ORIGINAL FACE                                     PASS-THROUGH
                                       PRIOR                                                  CURRENT            RATES
                                   PRINCIPAL                                                PRINCIPAL
     CLASS          CUSIP            BALANCE      INTEREST     PRINCIPAL          TOTAL       BALANCE       CURRENT           NEXT
------------------------------------------------------------------------------------------------------------------------------------
<S>             <C>     <C>       <C>             <C>           <C>           <C>          <C>            <C>            <C>
     M          055240DJ1         971.797462      5.320545      6.030980      11.351525    965.766481     6.606409%      6.606980%
     B-1        055240DK8         971.797455      5.320540      6.030982      11.351523    965.766473     6.606409%      6.606980%
     B-2        055240DL6         971.797468      5.320549      6.030980      11.351529    965.766488     6.606409%      6.606980%
     B-3        055240DM4         971.797458      5.320544      6.030998      11.351543    965.766460     6.606409%      6.606980%
     B-4        055240DN2         971.797413      5.320535      6.030961      11.351497    965.766452     6.606409%      6.606980%
     B-5        055240DP7         971.797490      5.320542      6.031021      11.351563    965.766469     6.606409%      6.606980%
     R-II       055240DR3           0.000000      0.000000      0.000000       0.000000      0.000000     6.750000%      6.750000%


------------------------------------------------------------------------------------------------------------------------------------
SELLER:                                    Bank of America                      ADMINISTRATOR:               Kelly L. Shea
SERVICER:                                  Bank of America                                               Bankers Trust Company
LEAD UNDERWRITER:                    Donaldson, Lufkin & Jenrette                                             3 Park Plaza
RECORD DATE:                                June 30, 1999                                                   Irvine, CA 92614
DISTRIBUTION DATE:                          July 26, 1999                       FACTOR INFORMATION:          (800) 735-7777
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                          Page 3 of 5   (C) COPYRIGHT 1999 Bankers Trust Company


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1

                         STATEMENT TO CERTIFICATEHOLDERS

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
Distribution Date:            July 26, 1999
------------------------------------------------------------------------------------------------------------------------------------


MORTGAGE POOL INFORMATION:                                                  GROUP I                     GROUP II
--------------------------                                                  -------                     --------

<S>                                                                      <C>                          <C>
                BEGINNING BALANCE OF POOL                                100,600,921.30               143,981,626.92
                LESS:         SCHEDULED PRINCIPAL                            (87,565.02)                (534,006.03)
                              PRINCIPAL PREPAYMENTS                       (1,736,631.61)              (1,342,921.92)
                              REPURCHASES                                          0.00                        0.00
                              LIQUIDATIONS                                         0.00                        0.00
                              OTHER UNSCHEDULED PRINCIPAL                          0.00                        0.00
                                                                          -------------               --------------
                ENDING BALANCE OF POOL                                    98,776,724.67               142,104,698.97
                                                                          =============               ==============

                BEGINNING NUMBER OF LOANS IN POOL                                   315                         435
                ENDING NUMBER OF LOANS IN POOL                                      310                         431

                WEIGHTED AVERAGE REMAINING TERM TO MATURITY                         335                         161
                WEIGHTED AVERAGE NET CONTRACT RATE                            7.513084%                   7.072131%

                CURRENT REALIZED LOSSES ON THE POOL                                0.00                        0.00
                CUMULATIVE REALIZED LOSSES ON THE POOL                             0.00                        0.00

                BEGINNING POOL BALANCE OF PREMIUM LOANS                   99,058,930.40               132,464,622.26
                STRIPPED INTEREST RATE                                        0.522518%                   0.218554%
</TABLE>

<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------------------------------------------------------
DELINQUENT, BANKRUPTCY,                                                                     LOANS         LOANS         LOANS
FORECLOSURE, AND REO                           30 TO 59      60 TO 89       90 PLUS          IN            IN             IN
LOAN INFORMATION                                 DAYS          DAYS           DAYS       BANKRUPTCY    FORECLOSURE       REO
------------------------------------------------------------------------------------------------------------------------------------

<S>                                                <C>           <C>            <C>           <C>           <C>            <C>
GROUP I         PRINCIPAL BALANCE                     0.00          0.00           0.00          0.00          0.00           0.00
                     PERCENTAGE OF GROUP BAL.      0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
                NUMBER OF LOANS                          0             0              0             0             0              0
                     PERCENTAGE OF LOANS           0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
GROUP II        PRINCIPAL BALANCE                     0.00          0.00           0.00          0.00          0.00           0.00
                     PERCENTAGE OF GROUP BAL.      0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
                NUMBER OF LOANS                          0             0              0             0             0              0
                     PERCENTAGE OF LOANS           0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
------------------------------------------------------------------------------------------------------------------------------------

                GROUP I BOOK VALUE OF REO PROPERTIES                                                             NA
                GROUP II BOOK VALUE OF REO PROPERTIES                                                            NA
</TABLE>

<TABLE>
<CAPTION>
SERVICING INFORMATION:                                                      GROUP I                     GROUP II
----------------------                                                      -------                     --------
<S>                                                                           <C>                         <C>
                SERVICING FEES ACCRUED DURING THE CURRENT DUE PERIOD          20,958.52                   46,320.86
                PLUS:         ADDITIONAL SERVICING COMPENSATION                    0.00                        0.00
                LESS:         AMTS. TO COVER PREPAYMENT INT. SHORTFALL        (6,671.10)                  (5,796.48)
                              DELINQUENT SERVICING FEES                       (1,083.25)                   2,381.00
                                                                          -------------               --------------
                SERVICING FEES COLLECTED FOR THE CURRENT DUE PERIOD           13,204.17                   42,905.38
                                                                          =============               ==============
                ADVANCED PRINCIPAL                                             4,565.50                   26,326.47
                ADVANCED INTEREST                                             31,295.09                   40,470.94


------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                          Page 4 of 5   (C) COPYRIGHT 1999 Bankers Trust Company


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1

                         STATEMENT TO CERTIFICATEHOLDERS

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
Distribution Date:            July 26, 1999
------------------------------------------------------------------------------------------------------------------------------------


------------------------------------------------------------------------------------------------------------------------------------
                                                 OTHER                                   CUMULATIVE
                                PREPAYMENT    UNSCHEDULED                 CERTIFICATE      UNPAID                     CUMULATIVE
                                PRINCIPAL      PRINCIPAL                    INTEREST      INTEREST                     REALIZED
     CLASS                     DISTRIBUTED    DISTRIBUTED                  SHORTFALL      SHORTFALL                     LOSSES
------------------------------------------------------------------------------------------------------------------------------------
<S>                             <C>                   <C>                          <C>           <C>                          <C>
       CLASS IA-1               1,736,612.43          0.00                         0.00          0.00                         0.00
       CLASS IA-2                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-3                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-4                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-5                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-6                       0.00          0.00                         0.00          0.00                         0.00
       CLASS I-X                        0.00          0.00                         0.00          0.00                         0.00
       CLASS I-PO                      19.18          0.00                         0.00          0.00                         0.00
       CLASS IIA-1                838,362.98          0.00                         0.00          0.00                         0.00
       CLASS IIA-2                  9,117.89          0.00                         0.00          0.00                         0.00
       CLASS IIA-3                      0.00          0.00                         0.00          0.00                         0.00
       CLASS IIA-4                 51,580.26          0.00                         0.00          0.00                         0.00
       CLASS IIA-5                442,895.06          0.00                         0.00          0.00                         0.00
       CLASS IIA-6                      0.00          0.00                         0.00          0.00                         0.00
       CLASS II-X                       0.00          0.00                         0.00          0.00                         0.00
       CLASS II-PO                    965.72          0.00                         0.00          0.00                         0.00
       CLASS M                          0.00          0.00                         0.00          0.00                         0.00
       CLASS B-1                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-2                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-3                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-4                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-5                        0.00          0.00                         0.00          0.00                         0.00
------------------------------------------------------------------------------------------------------------------------------------
    TOTALS                      3,079,553.53          0.00                         0.00          0.00                         0.00
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>


<TABLE>
<CAPTION>
<S>                                                                                                          <C>
                OTHER REPORTING ITEMS:


                GROUP I PERCENTAGE                                                                           96.12%
                GROUP I PREPAYMENT PERCENTAGE                                                               100.00%
                GROUP II PERCENTAGE                                                                          96.33%
                GROUP II PREPAYMENT PERCENTAGE                                                              100.00%

                SUBORDINATE PRINCIPAL DISTRIBUTION AMOUNT                                                 22,945.20
                HAS THE CREDIT SUPPORT DEPLETION DATE OCCURRED                                                   No

                BANKRUPTCY AMOUNT                                                                        100,000.00
                FRAUD LOSS AMOUNT                                                                        119,926.36
                SPECIAL HAZARD AMOUNT                                                                  4,500,664.47
                EXTRAORDINARY LOSSES FOR THE PRIOR PERIOD                                                      0.00

                GROUP I EXTRAORDINARY LOSSES                                                                   0.00
                GROUP II EXTRAORDINARY LOSSES                                                                  0.00

------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                          Page 5 of 5   (C) COPYRIGHT 1999 Bankers Trust Company


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1
                         STATEMENT TO CERTIFICATEHOLDERS

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                                                     DISTRIBUTIONS IN DOLLARS
                                         PRIOR                                                                               CURRENT
                     ORIGINAL        PRINCIPAL                                                 REALIZED      DEFERRED      PRINCIPAL
     CLASS         FACE VALUE          BALANCE      INTEREST     PRINCIPAL          TOTAL        LOSSES      INTEREST        BALANCE
------------------------------------------------------------------------------------------------------------------------------------
<S>            <C>              <C>             <C>           <C>            <C>                   <C>           <C>  <C>
     P1-M           21,501.00        21,207.24          0.00         20.23          20.23          0.00          0.00      21,187.01
     P2-M          350,133.00       330,902.03          0.00      1,306.67       1,306.67          0.00          0.00     329,595.36
     X1-M *    142,084,361.67    97,236,268.85     42,385.11          0.00      42,385.11          0.00          0.00  96,907,302.19
     X2-M *    187,559,494.52   130,633,579.04     23,760.10          0.00      23,760.10          0.00          0.00 128,356,879.48
     Y1             71,698.81        48,465.68        272.62        178.31         450.93          0.00          0.00      48,287.37
     Y2             99,676.65        64,370.56        348.67          0.00         348.67          0.00          0.00      64,370.56
     Z1        143,556,266.44    98,707,051.68    555,227.17    330,312.03     885,539.20          0.00          0.00  98,376,739.65
     Z2        199,253,620.42   141,709,426.14    767,592.72  2,320,679.83   3,088,272.55          0.00          0.00 139,388,746.31
     R-I                50.00             0.00          0.00          0.00           0.00          0.00          0.00           0.00

------------------------------------------------------------------------------------------------------------------------------------
TOTALS         343,352,946.32   240,881,423.33  1,389,586.39  2,652,497.07   4,042,083.46          0.00          0.00 238,228,926.26
------------------------------------------------------------------------------------------------------------------------------------
  *Notional Class Balance
</TABLE>

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                            FACTOR INFORMATION PER $1000 OF ORIGINAL FACE                                     PASS-THROUGH
                                       PRIOR                                                  CURRENT            RATES
                                   PRINCIPAL                                                PRINCIPAL
     CLASS          CUSIP            BALANCE      INTEREST     PRINCIPAL          TOTAL       BALANCE       CURRENT           NEXT
------------------------------------------------------------------------------------------------------------------------------------
<S>             <C>                 <C>           <C>           <C>            <C>           <C>          <C>            <C>
     P1-M                         986.337380      0.000000      0.940886       0.940886    985.396493     0.000000%      0.000000%
     P2-M                         945.075243      0.000000      3.731925       3.731925    941.343318     0.000000%      0.000000%
     X1-M *                       684.355883      0.298309      0.000000       0.298309    682.040592     0.523078%      0.523078%
     X2-M *                       696.491422      0.126680      0.000000       0.126680    684.352876     0.218260%      0.218260%
     Y1                           675.962102      3.802294      2.486900       6.289194    673.475171     6.750000%      6.750000%
     Y2                           645.793784      3.498011      0.000000       3.498011    645.793784     6.500000%      6.500000%
     Z1                           687.584416      3.867662      2.300924       6.168586    685.283493     6.750000%      6.750000%
     Z2                           711.201261      3.852340     11.646864      15.499204    699.554397     6.500000%      6.500000%
     R-I        055240DQ5           0.000000      0.000000      0.000000       0.000000      0.000000     6.750000%      6.750000%

------------------------------------------------------------------------------------------------------------------------------------
SELLER:                                    Bank of America                      ADMINISTRATOR:               Kelly L. Shea
SERVICER:                                  Bank of America                                               Bankers Trust Company
LEAD UNDERWRITER:                    Donaldson, Lufkin & Jenrette                                             3 Park Plaza
RECORD DATE:                                July 30, 1999                                                   Irvine, CA 92614
DISTRIBUTION DATE:                         August 25, 1999                      FACTOR INFORMATION:          (800) 735-7777
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>

                          Page 1 of 5   (C) COPYRIGHT 1999 Bankers Trust Company


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1
                         STATEMENT TO CERTIFICATEHOLDERS

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                                                     DISTRIBUTIONS IN DOLLARS
                                       PRIOR                                                                               CURRENT
                     ORIGINAL      PRINCIPAL                                                 REALIZED      DEFERRED      PRINCIPAL
     CLASS         FACE VALUE        BALANCE      INTEREST     PRINCIPAL          TOTAL        LOSSES      INTEREST        BALANCE
------------------------------------------------------------------------------------------------------------------------------------
<S>            <C>            <C>             <C>           <C>            <C>                   <C>           <C>  <C>
     IA-1       96,101,504.00  51,277,321.98    288,434.94    327,015.65     615,450.59          0.00          0.00  50,950,306.33
     IA-2        5,000,000.00   5,000,000.00     28,125.00          0.00      28,125.00          0.00          0.00   5,000,000.00
     IA-3        9,500,000.00   9,500,000.00     53,437.50          0.00      53,437.50          0.00          0.00   9,500,000.00
     IA-4       14,250,000.00  14,250,000.00     80,156.25          0.00      80,156.25          0.00          0.00  14,250,000.00
     IA-5        4,887,000.00   4,887,000.00     27,489.38          0.00      27,489.38          0.00          0.00   4,887,000.00
     IA-6        9,939,000.00   9,939,000.00     55,906.88          0.00      55,906.88          0.00          0.00   9,939,000.00
     I-X *      11,983,709.00   7,535,131.36     42,385.09          0.00      42,385.09          0.00          0.00   7,497,957.01
     I-PO           21,501.00      21,207.24          0.00         20.23          20.23          0.00          0.00      21,187.01
     IIA-1     121,111,453.00  85,311,544.08    462,104.20  1,437,624.17   1,899,728.37          0.00          0.00  83,873,919.91
     IIA-2       1,000,000.00     581,287.75      3,148.64     16,351.69      19,500.33          0.00          0.00     564,936.06
     IIA-3       8,262,000.00   8,262,000.00     44,752.50          0.00      44,752.50          0.00          0.00   8,262,000.00
     IIA-4      14,913,749.00  14,166,577.80     76,735.63     52,938.70     129,674.33          0.00          0.00  14,113,639.10
     IIA-5      46,447,250.00  28,235,616.13    152,942.92    794,270.85     947,213.77          0.00          0.00  27,441,345.28
     IIA-6       2,127,000.00           0.00          0.00          0.00           0.00          0.00          0.00           0.00
     II-X *      7,513,508.12   4,386,480.15     23,760.10          0.00      23,760.10          0.00          0.00   4,313,461.01
     II-PO         350,133.00     330,902.03          0.00      1,306.67       1,306.67          0.00          0.00     329,595.36

------------------------------------------------------------------------------------------------------------------------------------
TOTALS         333,910,590.00 231,762,457.01  1,339,379.03  2,629,527.96   3,968,906.99          0.00          0.00 229,132,929.05
------------------------------------------------------------------------------------------------------------------------------------
  *Notional Class Balance
</TABLE>

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                            FACTOR INFORMATION PER $1000 OF ORIGINAL FACE                                     PASS-THROUGH
                                       PRIOR                                                  CURRENT            RATES
                                   PRINCIPAL                                                PRINCIPAL
     CLASS          CUSIP            BALANCE      INTEREST     PRINCIPAL          TOTAL       BALANCE       CURRENT           NEXT
------------------------------------------------------------------------------------------------------------------------------------
<S>             <C>               <C>             <C>           <C>            <C>         <C>            <C>            <C>
     IA-1       055240CT0         533.574604      3.001357      3.402815       6.404172    530.171789     6.750000%      6.750000%
     IA-2       055240CU7       1,000.000000      5.625000      0.000000       5.625000  1,000.000000     6.750000%      6.750000%
     IA-3       055240CV5       1,000.000000      5.625000      0.000000       5.625000  1,000.000000     6.750000%      6.750000%
     IA-4       055240CW3       1,000.000000      5.625000      0.000000       5.625000  1,000.000000     6.750000%      6.750000%
     IA-5       055240CX1       1,000.000000      5.625001      0.000000       5.625001  1,000.000000     6.750000%      6.750000%
     IA-6       055240CY9       1,000.000000      5.625001      0.000000       5.625001  1,000.000000     6.750000%      6.750000%
     I-X *      055240DF9         628.781236      5.624997      0.000000       5.624997    625.679162     6.750000%      0.000000%
     I-PO       055240DH5         986.337380      0.000000      0.940886       0.940886    985.396493     0.000000%      6.500000%
     IIA-1      055240CZ6         704.405256      3.815528     11.870258      15.685786    692.534998     6.500000%      6.500000%
     IIA-2      055240DA0         581.287750      3.148640     16.351690      19.500330    564.936060     6.500000%      6.500000%
     IIA-3      055240DB8       1,000.000000      5.416667      0.000000       5.416667  1,000.000000     6.500000%      6.500000%
     IIA-4      055240DC6         949.900511      5.145294      3.549657       8.694952    946.350854     6.500000%      6.500000%
     IIA-5      055240DD4         607.907166      3.292830     17.100493      20.393323    590.806674     6.500000%      6.500000%
     IIA-6      055240DE2           0.000000      0.000000      0.000000       0.000000      0.000000     6.500000%      6.500000%
     II-X *     055240DG7         583.812526      3.162318      0.000000       3.162318    574.094144     6.500000%      0.000000%
     II-PO      055240DU6         945.075243      0.000000      3.731925       3.731925    941.343318     0.000000%      0.000000%



------------------------------------------------------------------------------------------------------------------------------------
SELLER:                                    Bank of America                      ADMINISTRATOR:               Kelly L. Shea
SERVICER:                                  Bank of America                                               Bankers Trust Company
LEAD UNDERWRITER:                    Donaldson, Lufkin & Jenrette                                             3 Park Plaza
RECORD DATE:                                July 30, 1999                                                   Irvine, CA 92614
DISTRIBUTION DATE:                         August 25, 1999                           FACTOR INFORMATION:     (800) 735-7777
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                          Page 2 of 5   (C) COPYRIGHT 1999 Bankers Trust Company


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1
                         STATEMENT TO CERTIFICATEHOLDERS
<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                                                     DISTRIBUTIONS IN DOLLARS
                                       PRIOR                                                                               CURRENT
                     ORIGINAL      PRINCIPAL                                                 REALIZED      DEFERRED      PRINCIPAL
     CLASS         FACE VALUE        BALANCE      INTEREST     PRINCIPAL          TOTAL        LOSSES      INTEREST        BALANCE
------------------------------------------------------------------------------------------------------------------------------------
<S>              <C>            <C>              <C>            <C>           <C>                <C>           <C>    <C>
     M           3,776,882.00   3,647,586.04     20,082.94      9,187.64      29,270.58          0.00          0.00   3,638,398.40
     B-1         2,231,794.00   2,155,391.82     11,867.19      5,429.06      17,296.25          0.00          0.00   2,149,962.76
     B-2         1,201,735.00   1,160,595.39      6,390.03      2,923.34       9,313.37          0.00          0.00   1,157,672.05
     B-3         1,030,060.00     994,797.40      5,477.17      2,505.72       7,982.89          0.00          0.00     992,291.68
     B-4           515,029.00     497,397.73      2,738.58      1,252.86       3,991.44          0.00          0.00     496,144.87
     B-5           686,706.32     663,197.94      3,651.45      1,670.49       5,321.94          0.00          0.00     661,527.45
     R-II               50.00           0.00          0.00          0.00           0.00          0.00          0.00           0.00



------------------------------------------------------------------------------------------------------------------------------------
TOTALS           9,442,256.32   9,118,966.32     50,207.36     22,969.11      73,176.47          0.00          0.00   9,095,997.21
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>


<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                            FACTOR INFORMATION PER $1000 OF ORIGINAL FACE                                     PASS-THROUGH
                                       PRIOR                                                  CURRENT            RATES
                                   PRINCIPAL                                                PRINCIPAL
     CLASS          CUSIP            BALANCE      INTEREST     PRINCIPAL          TOTAL       BALANCE       CURRENT           NEXT
------------------------------------------------------------------------------------------------------------------------------------

<S>             <C>               <C>             <C>           <C>            <C>         <C>            <C>            <C>
     M          055240DJ1         965.766481      5.317333      2.432599       7.749932    963.333882     6.606980%      6.607155%
     B-1        055240DK8         965.766473      5.317332      2.432599       7.749931    963.333874     6.606980%      6.607155%
     B-2        055240DL6         965.766488      5.317337      2.432600       7.749937    963.333888     6.606980%      6.607155%
     B-3        055240DM4         965.766460      5.317331      2.432596       7.749927    963.333864     6.606980%      6.607155%
     B-4        055240DN2         965.766452      5.317332      2.432601       7.749933    963.333851     6.606980%      6.607155%
     B-5        055240DP7         965.766469      5.317339      2.432612       7.749951    963.333857     6.606980%      6.607155%
     R-II       055240DR3           0.000000      0.000000      0.000000       0.000000      0.000000     6.750000%      6.750000%

------------------------------------------------------------------------------------------------------------------------------------
SELLER:                                    Bank of America                      ADMINISTRATOR:               Kelly L. Shea
SERVICER:                                  Bank of America                                               Bankers Trust Company
LEAD UNDERWRITER:                    Donaldson, Lufkin & Jenrette                                             3 Park Plaza
RECORD DATE:                                July 30, 1999                                                   Irvine, CA 92614
DISTRIBUTION DATE:                         August 25, 1999                      FACTOR INFORMATION:          (800) 735-7777
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                          Page 3 of 5   (C) COPYRIGHT 1999 Bankers Trust Company


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1

                         STATEMENT TO CERTIFICATEHOLDERS

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
Distribution Date:            August 25, 1999
------------------------------------------------------------------------------------------------------------------------------------

MORTGAGE POOL INFORMATION:                                                  GROUP I                     GROUP II
--------------------------                                                  -------                     --------

<S>                                                                       <C>                         <C>
                BEGINNING BALANCE OF POOL                                 98,776,724.67               142,104,698.97
                LESS:         SCHEDULED PRINCIPAL                            (87,956.62)                (531,058.87)
                              PRINCIPAL PREPAYMENTS                         (242,553.96)              (1,790,927.62)
                              REPURCHASES                                          0.00                        0.00
                              LIQUIDATIONS                                         0.00                        0.00
                              OTHER UNSCHEDULED PRINCIPAL                          0.00                        0.00
                                                                          -------------               --------------
                ENDING BALANCE OF POOL                                    98,446,214.09               139,782,712.48
                                                                          =============               ==============

                BEGINNING NUMBER OF LOANS IN POOL                                   310                         431
                ENDING NUMBER OF LOANS IN POOL                                      309                         427

                WEIGHTED AVERAGE REMAINING TERM TO MATURITY                         334                         160
                WEIGHTED AVERAGE NET CONTRACT RATE                            7.513471%                   7.071944%

                CURRENT REALIZED LOSSES ON THE POOL                                0.00                        0.00
                CUMULATIVE REALIZED LOSSES ON THE POOL                             0.00                        0.00

                BEGINNING POOL BALANCE OF PREMIUM LOANS                   97,236,268.85               130,633,579.04
                STRIPPED INTEREST RATE                                        0.523078%                   0.218260%
</TABLE>

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
DELINQUENT, BANKRUPTCY,                                                                     LOANS         LOANS         LOANS
FORECLOSURE, AND REO                           30 TO 59      60 TO 89       90 PLUS          IN            IN             IN
LOAN INFORMATION                                 DAYS          DAYS           DAYS       BANKRUPTCY    FORECLOSURE       REO
------------------------------------------------------------------------------------------------------------------------------------

<S>                                                <C>           <C>            <C>           <C>           <C>            <C>
GROUP I         PRINCIPAL BALANCE                     0.00          0.00           0.00          0.00          0.00           0.00
                     PERCENTAGE OF GROUP BAL.      0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
                NUMBER OF LOANS                          0             0              0             0             0              0
                     PERCENTAGE OF LOANS           0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
GROUP II        PRINCIPAL BALANCE                     0.00          0.00           0.00          0.00          0.00           0.00
                     PERCENTAGE OF GROUP BAL.      0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
                NUMBER OF LOANS                          0             0              0             0             0              0
                     PERCENTAGE OF LOANS           0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
------------------------------------------------------------------------------------------------------------------------------------
                GROUP I BOOK VALUE OF REO PROPERTIES                                                             NA
                GROUP II BOOK VALUE OF REO PROPERTIES                                                            NA
</TABLE>

<TABLE>
<CAPTION>
SERVICING INFORMATION:                                                      GROUP I                     GROUP II
----------------------                                                      -------                     --------

<S>                                                                           <C>                         <C>
                SERVICING FEES ACCRUED DURING THE CURRENT DUE PERIOD          20,578.48                   45,762.27
                PLUS:         ADDITIONAL SERVICING COMPENSATION                    0.00                        0.00
                LESS:         AMTS. TO COVER PREPAYMENT INT. SHORTFALL          (788.65)                  (3,962.93)
                              DELINQUENT SERVICING FEES                       (2,400.34)                   2,992.02
                                                                          -------------               --------------
                SERVICING FEES COLLECTED FOR THE CURRENT DUE PERIOD           17,389.49                   44,791.36
                                                                          =============               ==============
                ADVANCED PRINCIPAL                                             9,990.91                   32,577.81
                ADVANCED INTEREST                                             69,636.52                   50,199.51
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                          Page 4 of 5   (C) COPYRIGHT 1999 Bankers Trust Company


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1

                         STATEMENT TO CERTIFICATEHOLDERS

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
Distribution Date:            August 25, 1999
------------------------------------------------------------------------------------------------------------------------------------
                                                 OTHER                                   CUMULATIVE
                                PREPAYMENT    UNSCHEDULED                 CERTIFICATE      UNPAID                     CUMULATIVE
                                PRINCIPAL      PRINCIPAL                    INTEREST      INTEREST                     REALIZED
     CLASS                     DISTRIBUTED    DISTRIBUTED                  SHORTFALL      SHORTFALL                     LOSSES
------------------------------------------------------------------------------------------------------------------------------------

<S>                               <C>                 <C>                          <C>           <C>                          <C>
       CLASS IA-1                 242,538.96          0.00                         0.00          0.00                         0.00
       CLASS IA-2                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-3                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-4                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-5                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-6                       0.00          0.00                         0.00          0.00                         0.00
       CLASS I-X                        0.00          0.00                         0.00          0.00                         0.00
       CLASS I-PO                      15.00          0.00                         0.00          0.00                         0.00
       CLASS IIA-1              1,118,214.85          0.00                         0.00          0.00                         0.00
       CLASS IIA-2                 12,718.69          0.00                         0.00          0.00                         0.00
       CLASS IIA-3                      0.00          0.00                         0.00          0.00                         0.00
       CLASS IIA-4                 41,176.85          0.00                         0.00          0.00                         0.00
       CLASS IIA-5                617,800.87          0.00                         0.00          0.00                         0.00
       CLASS IIA-6                      0.00          0.00                         0.00          0.00                         0.00
       CLASS II-X                       0.00          0.00                         0.00          0.00                         0.00
       CLASS II-PO                  1,016.36          0.00                         0.00          0.00                         0.00
       CLASS M                          0.00          0.00                         0.00          0.00                         0.00
       CLASS B-1                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-2                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-3                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-4                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-5                        0.00          0.00                         0.00          0.00                         0.00
------------------------------------------------------------------------------------------------------------------------------------
    TOTALS                      2,033,481.58          0.00                         0.00          0.00                         0.00
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>


<TABLE>
<CAPTION>

<S>                                                                                                          <C>
                OTHER REPORTING ITEMS:

                GROUP I PERCENTAGE                                                                           96.05%
                GROUP I PREPAYMENT PERCENTAGE                                                               100.00%
                GROUP II PERCENTAGE                                                                          96.32%
                GROUP II PREPAYMENT PERCENTAGE                                                              100.00%

                SUBORDINATE PRINCIPAL DISTRIBUTION AMOUNT                                                 22,969.11
                HAS THE CREDIT SUPPORT DEPLETION DATE OCCURRED                                                   No

                BANKRUPTCY AMOUNT                                                                        100,000.00
                FRAUD LOSS AMOUNT                                                                        119,926.36
                SPECIAL HAZARD AMOUNT                                                                  4,500,664.47
                EXTRAORDINARY LOSSES FOR THE PRIOR PERIOD                                                      0.00

                GROUP I EXTRAORDINARY LOSSES                                                                   0.00
                GROUP II EXTRAORDINARY LOSSES                                                                  0.00

------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                          Page 5 of 5   (C) COPYRIGHT 1999 Bankers Trust Company


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1
                         STATEMENT TO CERTIFICATEHOLDERS

<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------------------------------------------------------
                                                     DISTRIBUTIONS IN DOLLARS
                                           PRIOR                                                                            CURRENT
                     ORIGINAL          PRINCIPAL                                                 REALIZED   DEFERRED      PRINCIPAL
     CLASS         FACE VALUE            BALANCE      INTEREST     PRINCIPAL          TOTAL        LOSSES   INTEREST        BALANCE
-----------------------------------------------------------------------------------------------------------------------------------
<S>            <C>                <C>             <C>           <C>            <C>                   <C>        <C>  <C>
     P1-M           21,501.00          21,187.01          0.00         20.35          20.35          0.00       0.00      21,166.67
     P2-M          350,133.00         329,595.36          0.00      1,348.00       1,348.00          0.00       0.00     328,247.36
     X1-M *    142,084,361.67      96,907,302.19     42,176.01          0.00      42,176.01          0.00       0.00  95,884,663.90
     X2-M *    187,559,494.52     128,356,879.48     23,364.58          0.00      23,364.58          0.00       0.00 127,591,388.85
     Y1             71,698.81          48,287.37        271.63         99.03         370.65          0.00       0.00      48,188.34
     Y2             99,676.65          64,370.56        348.67        320.11         668.78          0.00       0.00      64,050.45
     Z1        143,556,266.44      98,376,739.65    553,369.16  1,024,071.73   1,577,440.89          0.00       0.00  97,352,667.92
     Z2        199,253,620.42     139,388,746.31    755,022.38    810,749.05   1,565,771.43          0.00       0.00 138,577,997.26
     R-I                50.00               0.00          0.00          0.00           0.00          0.00       0.00           0.00

-----------------------------------------------------------------------------------------------------------------------------------
TOTALS         343,352,946.32     238,228,926.26  1,374,552.43  1,836,608.26   3,211,160.69          0.00       0.00 236,392,318.00
-----------------------------------------------------------------------------------------------------------------------------------
  *Notional Class Balance
</TABLE>

<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------------------------------------------------------
                            FACTOR INFORMATION PER $1000 OF ORIGINAL FACE                                     PASS-THROUGH
                                       PRIOR                                                  CURRENT            RATES
                                   PRINCIPAL                                                PRINCIPAL
     CLASS          CUSIP            BALANCE      INTEREST     PRINCIPAL          TOTAL       BALANCE       CURRENT           NEXT
-----------------------------------------------------------------------------------------------------------------------------------
<S>             <C>               <C>             <C>           <C>            <C>           <C>          <C>            <C>
     P1-M                         985.396493      0.000000      0.946235       0.946235    984.450491     0.000000%      0.000000%
     P2-M                         941.343318      0.000000      3.849966       3.849966    937.493353     0.000000%      0.000000%
     X1-M *                       682.040592      0.296838      0.000000       0.296838    674.843190     0.522264%      0.522264%
     X2-M *                       684.352876      0.124572      0.000000       0.124572    680.271554     0.218434%      0.218434%
     Y1                           673.475171      3.788417      1.381156       5.169573    672.093976     6.750000%      6.750000%
     Y2                           645.793784      3.498011      3.211477       6.709488    642.582300     6.500000%      6.500000%
     Z1                           685.283493      3.854720      7.133591      10.988311    678.149901     6.750000%      6.750000%
     Z2                           699.554397      3.789253      4.068930       7.858183    695.485467     6.500000%      6.500000%
     R-I        055240DQ5           0.000000      0.000000      0.000000       0.000000      0.000000     6.750000%      6.750000%

-----------------------------------------------------------------------------------------------------------------------------------
SELLER:                                    Bank of America                      ADMINISTRATOR:               Kelly L. Shea
SERVICER:                                  Bank of America                                               Bankers Trust Company
LEAD UNDERWRITER:                    Donaldson, Lufkin & Jenrette                                             3 Park Plaza
RECORD DATE:                               August 31, 1999                                                  Irvine, CA 92614
DISTRIBUTION DATE:                        September 27, 1999                    FACTOR INFORMATION:          (800) 735-7777
-----------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                          Page 1 of 5   (C) COPYRIGHT 1999 Bankers Trust Company


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1
                         STATEMENT TO CERTIFICATEHOLDERS

<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------------------------------------------------------
                                                     DISTRIBUTIONS IN DOLLARS
                                       PRIOR                                                                               CURRENT
                     ORIGINAL      PRINCIPAL                                                 REALIZED      DEFERRED      PRINCIPAL
     CLASS         FACE VALUE        BALANCE      INTEREST     PRINCIPAL          TOTAL        LOSSES      INTEREST        BALANCE
-----------------------------------------------------------------------------------------------------------------------------------
<S>            <C>            <C>             <C>           <C>            <C>                   <C>           <C>  <C>
     IA-1       96,101,504.00  50,950,306.33    286,595.47  1,020,692.48   1,307,287.95          0.00          0.00  49,929,613.85
     IA-2        5,000,000.00   5,000,000.00     28,125.00          0.00      28,125.00          0.00          0.00   5,000,000.00
     IA-3        9,500,000.00   9,500,000.00     53,437.50          0.00      53,437.50          0.00          0.00   9,500,000.00
     IA-4       14,250,000.00  14,250,000.00     80,156.25          0.00      80,156.25          0.00          0.00  14,250,000.00
     IA-5        4,887,000.00   4,887,000.00     27,489.38          0.00      27,489.38          0.00          0.00   4,887,000.00
     IA-6        9,939,000.00   9,939,000.00     55,906.88          0.00      55,906.88          0.00          0.00   9,939,000.00
     I-X *      11,983,709.00   7,497,957.01     42,176.01          0.00      42,176.01          0.00          0.00   7,412,318.72
     I-PO           21,501.00      21,187.01          0.00         20.34          20.34          0.00          0.00      21,166.67
     IIA-1     121,111,453.00  83,873,919.91    454,317.07    494,305.36     948,622.43          0.00          0.00  83,379,614.55
     IIA-2       1,000,000.00     564,936.06      3,060.07      4,902.58       7,962.65          0.00          0.00     560,033.48
     IIA-3       8,262,000.00   8,262,000.00     44,752.50          0.00      44,752.50          0.00          0.00   8,262,000.00
     IIA-4      14,913,749.00  14,113,639.10     76,448.88     53,880.70     130,329.58          0.00          0.00  14,059,758.40
     IIA-5      46,447,250.00  27,441,345.28    148,640.62    238,139.21     386,779.83          0.00          0.00  27,203,206.07
     IIA-6       2,127,000.00           0.00          0.00          0.00           0.00          0.00          0.00           0.00
     II-X *      7,513,508.12   4,313,461.01     23,364.58          0.00      23,364.58          0.00          0.00   4,286,022.73
     II-PO         350,133.00     329,595.36          0.00      1,348.00       1,348.00          0.00          0.00     328,247.36


-----------------------------------------------------------------------------------------------------------------------------------
TOTALS         333,910,590.00 229,132,929.05  1,324,470.21  1,813,288.67   3,137,758.88          0.00          0.00 227,319,640.38
-----------------------------------------------------------------------------------------------------------------------------------
  *Notional Class Balance
</TABLE>


<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------------------------------------------------------
                            FACTOR INFORMATION PER $1000 OF ORIGINAL FACE                                     PASS-THROUGH
                                       PRIOR                                                  CURRENT            RATES
                                   PRINCIPAL                                                PRINCIPAL
     CLASS          CUSIP            BALANCE      INTEREST     PRINCIPAL          TOTAL       BALANCE       CURRENT           NEXT
-----------------------------------------------------------------------------------------------------------------------------------
<S>             <C>             <C>               <C>          <C>            <C>        <C>              <C>            <C>
     IA-1       055240CT0         530.171789      2.982216     10.620983      13.603200    519.550806     6.750000%      6.750000%
     IA-2       055240CU7       1,000.000000      5.625000      0.000000       5.625000  1,000.000000     6.750000%      6.750000%
     IA-3       055240CV5       1,000.000000      5.625000      0.000000       5.625000  1,000.000000     6.750000%      6.750000%
     IA-4       055240CW3       1,000.000000      5.625000      0.000000       5.625000  1,000.000000     6.750000%      6.750000%
     IA-5       055240CX1       1,000.000000      5.625001      0.000000       5.625001  1,000.000000     6.750000%      6.750000%
     IA-6       055240CY9       1,000.000000      5.625001      0.000000       5.625001  1,000.000000     6.750000%      6.750000%
     I-X *      055240DF9         625.679162      5.625000      0.000000       5.625000    618.532936     6.750000%      0.000000%
     I-PO       055240DH5         985.396493      0.000000      0.946003       0.946003    984.450491     0.000000%      6.500000%
     IIA-1      055240CZ6         692.534998      3.751231      4.081409       7.832640    688.453590     6.500000%      6.500000%
     IIA-2      055240DA0         564.936060      3.060070      4.902580       7.962650    560.033480     6.500000%      6.500000%
     IIA-3      055240DB8       1,000.000000      5.416667      0.000000       5.416667  1,000.000000     6.500000%      6.500000%
     IIA-4      055240DC6         946.350854      5.126067      3.612821       8.738888    942.738033     6.500000%      6.500000%
     IIA-5      055240DD4         590.806674      3.200203      5.127090       8.327292    585.679584     6.500000%      6.500000%
     IIA-6      055240DE2           0.000000      0.000000      0.000000       0.000000      0.000000     6.500000%      6.500000%
     II-X *     055240DG7         574.094144      3.109677      0.000000       3.109677    570.442283     6.500000%      0.000000%
     II-PO      055240DU6         941.343318      0.000000      3.849966       3.849966    937.493353     0.000000%      0.000000%



-----------------------------------------------------------------------------------------------------------------------------------
SELLER:                                    Bank of America                      ADMINISTRATOR:               Kelly L. Shea
SERVICER:                                  Bank of America                                               Bankers Trust Company
LEAD UNDERWRITER:                    Donaldson, Lufkin & Jenrette                                             3 Park Plaza
RECORD DATE:                               August 31, 1999                                                  Irvine, CA 92614
DISTRIBUTION DATE:                        September 27, 1999                         FACTOR INFORMATION:     (800) 735-7777
-----------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                          Page 2 of 5   (C) COPYRIGHT 1999 Bankers Trust Company


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1
                         STATEMENT TO CERTIFICATEHOLDERS

<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------------------------------------------------------
                                                     DISTRIBUTIONS IN DOLLARS
                                      PRIOR                                                                               CURRENT
                     ORIGINAL      PRINCIPAL                                                 REALIZED      DEFERRED      PRINCIPAL
     CLASS         FACE VALUE        BALANCE      INTEREST     PRINCIPAL          TOTAL        LOSSES      INTEREST        BALANCE
-----------------------------------------------------------------------------------------------------------------------------------
<S>              <C>            <C>              <C>           <C>            <C>                <C>           <C>    <C>
     M           3,776,882.00   3,638,398.40     20,032.88      9,327.83      29,360.71          0.00          0.00   3,629,070.57
     B-1         2,231,794.00   2,149,962.76     11,837.61      5,511.90      17,349.51          0.00          0.00   2,144,450.86
     B-2         1,201,735.00   1,157,672.05      6,374.10      2,967.95       9,342.05          0.00          0.00   1,154,704.10
     B-3         1,030,060.00     992,291.68      5,463.52      2,543.96       8,007.48          0.00          0.00     989,747.72
     B-4           515,029.00     496,144.87      2,731.75      1,271.98       4,003.73          0.00          0.00     494,872.89
     B-5           686,706.32     661,527.45      3,642.35      1,695.97       5,338.32          0.00          0.00     659,831.48
     R-II               50.00           0.00          0.00          0.00           0.00          0.00          0.00           0.00

-----------------------------------------------------------------------------------------------------------------------------------
TOTALS           9,442,256.32   9,095,997.21     50,082.21     23,319.59      73,401.80          0.00          0.00   9,072,677.62
-----------------------------------------------------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------------------------------------------------------
                            FACTOR INFORMATION PER $1000 OF ORIGINAL FACE                                     PASS-THROUGH
                                       PRIOR                                                  CURRENT            RATES
                                   PRINCIPAL                                                PRINCIPAL
     CLASS          CUSIP            BALANCE      INTEREST     PRINCIPAL          TOTAL       BALANCE       CURRENT           NEXT
-----------------------------------------------------------------------------------------------------------------------------------
<S>             <C>               <C>             <C>           <C>            <C>         <C>            <C>            <C>
     M          055240DJ1         963.333882      5.304079      2.469717       7.773796    960.864165     6.607155%      6.607334%
     B-1        055240DK8         963.333874      5.304078      2.469717       7.773795    960.864157     6.607155%      6.607334%
     B-2        055240DL6         963.333888      5.304081      2.469721       7.773802    960.864167     6.607155%      6.607334%
     B-3        055240DM4         963.333864      5.304079      2.469720       7.773800    960.864144     6.607155%      6.607334%
     B-4        055240DN2         963.333851      5.304070      2.469725       7.773795    960.864126     6.607155%      6.607334%
     B-5        055240DP7         963.333857      5.304087      2.469717       7.773804    960.864141     6.607155%      6.607334%
     R-II       055240DR3           0.000000      0.000000      0.000000       0.000000      0.000000     6.750000%      6.750000%

-----------------------------------------------------------------------------------------------------------------------------------
SELLER:                                    Bank of America                      ADMINISTRATOR:               Kelly L. Shea
SERVICER:                                  Bank of America                                               Bankers Trust Company
LEAD UNDERWRITER:                    Donaldson, Lufkin & Jenrette                                             3 Park Plaza
RECORD DATE:                               August 31, 1999                                                  Irvine, CA 92614
DISTRIBUTION DATE:                        September 27, 1999                    FACTOR INFORMATION:          (800) 735-7777
-----------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                          Page 3 of 5   (C) COPYRIGHT 1999 Bankers Trust Company


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1

                         STATEMENT TO CERTIFICATEHOLDERS


<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------------------------------------------------------
Distribution Date:            September 27, 1999
-----------------------------------------------------------------------------------------------------------------------------------

MORTGAGE POOL INFORMATION:                                                  GROUP I                     GROUP II
--------------------------                                                  -------                     --------

<S>                                                                       <C>                         <C>
                BEGINNING BALANCE OF POOL                                 98,446,214.09               139,782,712.48
                LESS:         SCHEDULED PRINCIPAL                            (87,831.16)                (533,656.21)
                              PRINCIPAL PREPAYMENTS                         (936,359.95)                (278,760.94)
                              REPURCHASES                                          0.00                        0.00
                              LIQUIDATIONS                                         0.00                        0.00
                              OTHER UNSCHEDULED PRINCIPAL                          0.00                        0.00
                                                                          -------------               --------------
                ENDING BALANCE OF POOL                                    97,422,022.98               138,970,295.33
                                                                          =============               ==============

                BEGINNING NUMBER OF LOANS IN POOL                                   309                         427
                ENDING NUMBER OF LOANS IN POOL                                      306                         426

                WEIGHTED AVERAGE REMAINING TERM TO MATURITY                         333                         158
                WEIGHTED AVERAGE NET CONTRACT RATE                            7.512647%                   7.072108%

                CURRENT REALIZED LOSSES ON THE POOL                                0.00                        0.00
                CUMULATIVE REALIZED LOSSES ON THE POOL                             0.00                        0.00

                BEGINNING POOL BALANCE OF PREMIUM LOANS                   96,907,302.19               128,356,879.48
                STRIPPED INTEREST RATE                                        0.522264%                   0.218434%
</TABLE>

<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------------------------------------------------------
DELINQUENT, BANKRUPTCY,                                                                     LOANS         LOANS         LOANS
FORECLOSURE, AND REO                           30 TO 59      60 TO 89       90 PLUS          IN            IN             IN
LOAN INFORMATION                                 DAYS          DAYS           DAYS       BANKRUPTCY    FORECLOSURE       REO
-----------------------------------------------------------------------------------------------------------------------------------
<S>                                                <C>           <C>            <C>           <C>           <C>            <C>
GROUP I         PRINCIPAL BALANCE                     0.00          0.00           0.00          0.00          0.00           0.00
                     PERCENTAGE OF GROUP BAL.      0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
                NUMBER OF LOANS                          0             0              0             0             0              0
                     PERCENTAGE OF LOANS           0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
GROUP II        PRINCIPAL BALANCE                     0.00          0.00           0.00          0.00          0.00           0.00
                     PERCENTAGE OF GROUP BAL.      0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
                NUMBER OF LOANS                          0             0              0             0             0              0
                     PERCENTAGE OF LOANS           0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
-----------------------------------------------------------------------------------------------------------------------------------
                GROUP I BOOK VALUE OF REO PROPERTIES                                                             NA
                GROUP II BOOK VALUE OF REO PROPERTIES                                                            NA
</TABLE>

<TABLE>
<CAPTION>
SERVICING INFORMATION:                                                      GROUP I                     GROUP II
----------------------                                                      -------                     --------

<S>                                                                           <C>                         <C>
                SERVICING FEES ACCRUED DURING THE CURRENT DUE PERIOD          20,509.62                   45,063.10
                PLUS:         ADDITIONAL SERVICING COMPENSATION                    0.00                        0.00
                LESS:         AMTS. TO COVER PREPAYMENT INT. SHORTFALL        (1,065.40)                  (1,177.45)
                              DELINQUENT SERVICING FEES                       (1,755.59)                   1,469.15
                                                                          -------------               --------------
                SERVICING FEES COLLECTED FOR THE CURRENT DUE PERIOD           17,688.63                   45,354.80
                                                                          =============               ==============

                ADVANCED PRINCIPAL                                             7,427.54                   16,087.96
                ADVANCED INTEREST                                             50,674.28                   24,546.85
-----------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                          Page 4 of 5   (C) COPYRIGHT 1999 Bankers Trust Company


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1

                         STATEMENT TO CERTIFICATEHOLDERS

<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------------------------------------------------------
Distribution Date:            September 27, 1999
-----------------------------------------------------------------------------------------------------------------------------------
                                                 OTHER                                   CUMULATIVE
                                PREPAYMENT    UNSCHEDULED                 CERTIFICATE      UNPAID                     CUMULATIVE
                                PRINCIPAL      PRINCIPAL                    INTEREST      INTEREST                     REALIZED
     CLASS                     DISTRIBUTED    DISTRIBUTED                  SHORTFALL      SHORTFALL                     LOSSES
-----------------------------------------------------------------------------------------------------------------------------------
<S>                               <C>                 <C>                          <C>           <C>                          <C>
       CLASS IA-1                 936,341.29          0.00                         0.00          0.00                         0.00
       CLASS IA-2                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-3                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-4                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-5                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-6                       0.00          0.00                         0.00          0.00                         0.00
       CLASS I-X                        0.00          0.00                         0.00          0.00                         0.00
       CLASS I-PO                      18.66          0.00                         0.00          0.00                         0.00
       CLASS IIA-1                173,854.69          0.00                         0.00          0.00                         0.00
       CLASS IIA-2                  1,724.31          0.00                         0.00          0.00                         0.00
       CLASS IIA-3                      0.00          0.00                         0.00          0.00                         0.00
       CLASS IIA-4                 18,950.66          0.00                         0.00          0.00                         0.00
       CLASS IIA-5                 83,757.17          0.00                         0.00          0.00                         0.00
       CLASS IIA-6                      0.00          0.00                         0.00          0.00                         0.00
       CLASS II-X                       0.00          0.00                         0.00          0.00                         0.00
       CLASS II-PO                    474.11          0.00                         0.00          0.00                         0.00
       CLASS M                          0.00          0.00                         0.00          0.00                         0.00
       CLASS B-1                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-2                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-3                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-4                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-5                        0.00          0.00                         0.00          0.00                         0.00
-----------------------------------------------------------------------------------------------------------------------------------
    TOTALS                      1,215,120.89          0.00                         0.00          0.00                         0.00
-----------------------------------------------------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>

<S>                                                                                                          <C>
                OTHER REPORTING ITEMS:

                GROUP I PERCENTAGE                                                                           96.04%
                GROUP I PREPAYMENT PERCENTAGE                                                               100.00%
                GROUP II PERCENTAGE                                                                          96.27%
                GROUP II PREPAYMENT PERCENTAGE                                                              100.00%

                SUBORDINATE PRINCIPAL DISTRIBUTION AMOUNT                                                 23,319.59
                HAS THE CREDIT SUPPORT DEPLETION DATE OCCURRED                                                   No

                BANKRUPTCY AMOUNT                                                                        100,000.00
                FRAUD LOSS AMOUNT                                                                        119,926.36
                SPECIAL HAZARD AMOUNT                                                                  4,500,664.47
                EXTRAORDINARY LOSSES FOR THE PRIOR PERIOD                                                      0.00

                GROUP I EXTRAORDINARY LOSSES                                                                   0.00
                GROUP II EXTRAORDINARY LOSSES                                                                  0.00

-----------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                          Page 5 of 5   (C) COPYRIGHT 1999 Bankers Trust Company


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1
                         STATEMENT TO CERTIFICATEHOLDERS

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                                                     DISTRIBUTIONS IN DOLLARS
                                        PRIOR                                                                               CURRENT
                     ORIGINAL       PRINCIPAL                                                 REALIZED      DEFERRED      PRINCIPAL
     CLASS         FACE VALUE         BALANCE      INTEREST     PRINCIPAL          TOTAL        LOSSES      INTEREST        BALANCE
------------------------------------------------------------------------------------------------------------------------------------
<S>            <C>             <C>             <C>           <C>            <C>                   <C>           <C>  <C>
     P1-M           21,501.00       21,166.67          0.00         20.34          20.34          0.00          0.00      21,146.34
     P2-M          350,133.00      328,247.36          0.00      1,573.99       1,573.99          0.00          0.00     326,673.37
     X1-M *    142,084,361.67   95,884,663.90     41,694.29          0.00      41,694.29          0.00          0.00  94,627,880.14
     X2-M *    187,559,494.52  127,591,388.85     23,215.96          0.00      23,215.96          0.00          0.00 127,058,671.31
     Y1             71,698.81       48,188.34        271.05        746.15       1,017.20          0.00          0.00      47,442.19
     Y2             99,676.65       64,050.45        346.94      1,179.00       1,525.94          0.00          0.00      62,871.45
     Z1        143,556,266.44   97,352,667.92    547,608.76  1,257,491.91   1,805,100.67          0.00          0.00  96,095,176.01
     Z2        199,253,620.42  138,577,997.26    750,630.82    588,758.04   1,339,388.86          0.00          0.00 137,989,239.22
     R-I                50.00            0.00          0.00          0.00           0.00          0.00          0.00           0.00

------------------------------------------------------------------------------------------------------------------------------------
TOTALS         343,352,946.32  236,392,318.00  1,363,767.82  1,849,769.43   3,213,537.25          0.00          0.00 234,542,548.58
------------------------------------------------------------------------------------------------------------------------------------
  *Notional Class Balance
</TABLE>

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                            FACTOR INFORMATION PER $1000 OF ORIGINAL FACE                                     PASS-THROUGH
                                       PRIOR                                                  CURRENT            RATES
                                   PRINCIPAL                                                PRINCIPAL
     CLASS          CUSIP            BALANCE      INTEREST     PRINCIPAL          TOTAL       BALANCE       CURRENT           NEXT
------------------------------------------------------------------------------------------------------------------------------------
<S>             <C>                 <C>           <C>           <C>            <C>           <C>          <C>            <C>
     P1-M                         984.450491      0.000000      0.945770       0.945770    983.504953     0.000000%      0.000000%
     P2-M                         937.493353      0.000000      4.495406       4.495406    932.997946     0.000000%      0.000000%
     X1-M *                       674.843190      0.293447      0.000000       0.293447    665.997855     0.521806%      0.521806%
     X2-M *                       680.271554      0.123779      0.000000       0.123779    677.431295     0.218347%      0.218347%
     Y1                           672.093976      3.780397     10.406726      14.187123    661.687249     6.750000%      6.750000%
     Y2                           642.582300      3.480655     11.828276      15.308931    630.754053     6.500000%      6.500000%
     Z1                           678.149901      3.814593      8.759575      12.574168    669.390326     6.750000%      6.750000%
     Z2                           695.485467      3.767213      2.954817       6.722030    692.530650     6.500000%      6.500000%
     R-I        055240DQ5           0.000000      0.000000      0.000000       0.000000      0.000000     6.750000%      6.750000%

------------------------------------------------------------------------------------------------------------------------------------
SELLER:                                    Bank of America                      ADMINISTRATOR:               Kelly L. Shea
SERVICER:                                  Bank of America                                                   Deutsche Bank
LEAD UNDERWRITER:                    Donaldson, Lufkin & Jenrette                                       1761 E. St. Andrew Place
RECORD DATE:                              September 30, 1999                                              Santa Ana, CA 92705
DISTRIBUTION DATE:                         October 25, 1999                     FACTOR INFORMATION:          (800) 735-7777
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                                    Page 1 of 5 (C) COPYRIGHT 1999 Deutsche Bank


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1
                         STATEMENT TO CERTIFICATEHOLDERS

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                                                     DISTRIBUTIONS IN DOLLARS
                                       PRIOR                                                                               CURRENT
                     ORIGINAL      PRINCIPAL                                                 REALIZED      DEFERRED      PRINCIPAL
     CLASS         FACE VALUE        BALANCE      INTEREST     PRINCIPAL          TOTAL        LOSSES      INTEREST        BALANCE
------------------------------------------------------------------------------------------------------------------------------------
<S>            <C>            <C>             <C>           <C>            <C>                   <C>           <C>  <C>
     IA-1       96,101,504.00  49,929,613.85    280,854.08  1,254,737.85   1,535,591.93          0.00          0.00  48,674,876.00
     IA-2        5,000,000.00   5,000,000.00     28,125.00          0.00      28,125.00          0.00          0.00   5,000,000.00
     IA-3        9,500,000.00   9,500,000.00     53,437.50          0.00      53,437.50          0.00          0.00   9,500,000.00
     IA-4       14,250,000.00  14,250,000.00     80,156.25          0.00      80,156.25          0.00          0.00  14,250,000.00
     IA-5        4,887,000.00   4,887,000.00     27,489.38          0.00      27,489.38          0.00          0.00   4,887,000.00
     IA-6        9,939,000.00   9,939,000.00     55,906.88          0.00      55,906.88          0.00          0.00   9,939,000.00
     I-X *      11,983,709.00   7,412,318.72     41,694.27          0.00      41,694.27          0.00          0.00   7,311,390.59
     I-PO           21,501.00      21,166.67          0.00         20.33          20.33          0.00          0.00      21,146.34
     IIA-1     121,111,453.00  83,379,614.55    451,639.58    356,050.46     807,690.04          0.00          0.00  83,023,564.09
     IIA-2       1,000,000.00     560,033.48      3,033.51      3,218.01       6,251.52          0.00          0.00     556,815.47
     IIA-3       8,262,000.00   8,262,000.00     44,752.50          0.00      44,752.50          0.00          0.00   8,262,000.00
     IIA-4      14,913,749.00  14,059,758.40     76,157.02     54,344.11     130,501.13          0.00          0.00  14,005,414.29
     IIA-5      46,447,250.00  27,203,206.07    147,350.70    156,312.54     303,663.24          0.00          0.00  27,046,893.53
     IIA-6       2,127,000.00           0.00          0.00          0.00           0.00          0.00          0.00           0.00
     II-X *      7,513,508.12   4,286,022.73     23,215.96          0.00      23,215.96          0.00          0.00   4,268,072.15
     II-PO         350,133.00     328,247.36          0.00      1,573.99       1,573.99          0.00          0.00     326,673.37


------------------------------------------------------------------------------------------------------------------------------------
TOTALS         333,910,590.00 227,319,640.38  1,313,812.63  1,826,257.29   3,140,069.92          0.00          0.00 225,493,383.09
------------------------------------------------------------------------------------------------------------------------------------
  *Notional Class Balance
</TABLE>


<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                            FACTOR INFORMATION PER $1000 OF ORIGINAL FACE                                     PASS-THROUGH
                                       PRIOR                                                  CURRENT            RATES
                                   PRINCIPAL                                                PRINCIPAL
     CLASS          CUSIP            BALANCE      INTEREST     PRINCIPAL          TOTAL       BALANCE       CURRENT           NEXT
------------------------------------------------------------------------------------------------------------------------------------
<S>             <C>             <C>               <C>          <C>            <C>        <C>              <C>            <C>
     IA-1       055240CT0         519.550806      2.922473     13.056381      15.978854    506.494425     6.750000%      6.750000%
     IA-2       055240CU7       1,000.000000      5.625000      0.000000       5.625000  1,000.000000     6.750000%      6.750000%
     IA-3       055240CV5       1,000.000000      5.625000      0.000000       5.625000  1,000.000000     6.750000%      6.750000%
     IA-4       055240CW3       1,000.000000      5.625000      0.000000       5.625000  1,000.000000     6.750000%      6.750000%
     IA-5       055240CX1       1,000.000000      5.625001      0.000000       5.625001  1,000.000000     6.750000%      6.750000%
     IA-6       055240CY9       1,000.000000      5.625001      0.000000       5.625001  1,000.000000     6.750000%      6.750000%
     I-X *      055240DF9         618.532936      5.624997      0.000000       5.624997    610.110825     6.750000%      0.000000%
     I-PO       055240DH5         984.450491      0.000000      0.945537       0.945537    983.504953     0.000000%      6.500000%
     IIA-1      055240CZ6         688.453590      3.729124      2.939858       6.668982    685.513732     6.500000%      6.500000%
     IIA-2      055240DA0         560.033480      3.033510      3.218010       6.251520    556.815470     6.500000%      6.500000%
     IIA-3      055240DB8       1,000.000000      5.416667      0.000000       5.416667  1,000.000000     6.500000%      6.500000%
     IIA-4      055240DC6         942.738033      5.106497      3.643893       8.750390    939.094140     6.500000%      6.500000%
     IIA-5      055240DD4         585.679584      3.172431      3.365378       6.537809    582.314207     6.500000%      6.500000%
     IIA-6      055240DE2           0.000000      0.000000      0.000000       0.000000      0.000000     6.500000%      6.500000%
     II-X *     055240DG7         570.442283      3.089896      0.000000       3.089896    568.053176     6.500000%      0.000000%
     II-PO      055240DU6         937.493353      0.000000      4.495406       4.495406    932.997946     0.000000%      0.000000%



------------------------------------------------------------------------------------------------------------------------------------
SELLER:                                    Bank of America                      ADMINISTRATOR:               Kelly L. Shea
SERVICER:                                  Bank of America                                                   Deutsche Bank
LEAD UNDERWRITER:                    Donaldson, Lufkin & Jenrette                                       1761 E. St. Andrew Place
RECORD DATE:                              September 30, 1999                                              Santa Ana, CA 92705
DISTRIBUTION DATE:                         October 25, 1999                     FACTOR INFORMATION:          (800) 735-7777
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>

                                    Page 2 of 5 (C) COPYRIGHT 1999 Deutsche Bank


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1
                         STATEMENT TO CERTIFICATEHOLDERS


<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                                                     DISTRIBUTIONS IN DOLLARS
                                       PRIOR                                                                               CURRENT
                     ORIGINAL      PRINCIPAL                                                 REALIZED      DEFERRED      PRINCIPAL
     CLASS         FACE VALUE        BALANCE      INTEREST     PRINCIPAL          TOTAL        LOSSES      INTEREST        BALANCE
------------------------------------------------------------------------------------------------------------------------------------
<S>              <C>            <C>              <C>           <C>            <C>                <C>           <C>    <C>
     M           3,776,882.00   3,629,070.57     19,982.07      9,404.85      29,386.92          0.00          0.00   3,619,665.72
     B-1         2,231,794.00   2,144,450.86     11,807.59      5,557.41      17,365.00          0.00          0.00   2,138,893.45
     B-2         1,201,735.00   1,154,704.10      6,357.93      2,992.45       9,350.38          0.00          0.00   1,151,711.65
     B-3         1,030,060.00     989,747.72      5,449.66      2,564.96       8,014.62          0.00          0.00     987,182.76
     B-4           515,029.00     494,872.89      2,724.83      1,282.48       4,007.31          0.00          0.00     493,590.41
     B-5           686,706.32     659,831.48      3,633.11      1,709.98       5,343.09          0.00          0.00     658,121.50
     R-II               50.00           0.00          0.00          0.00           0.00          0.00          0.00           0.00


------------------------------------------------------------------------------------------------------------------------------------
TOTALS           9,442,256.32   9,072,677.62     49,955.19     23,512.13      73,467.32          0.00          0.00   9,049,165.49
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>


<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                            FACTOR INFORMATION PER $1000 OF ORIGINAL FACE                                     PASS-THROUGH
                                       PRIOR                                                  CURRENT            RATES
                                   PRINCIPAL                                                PRINCIPAL
     CLASS          CUSIP            BALANCE      INTEREST     PRINCIPAL          TOTAL       BALANCE       CURRENT           NEXT
------------------------------------------------------------------------------------------------------------------------------------
<S>             <C>               <C>             <C>           <C>            <C>         <C>            <C>            <C>
     M          055240DJ1         960.864165      5.290626      2.490110       7.780736    958.374056     6.607334%      6.607517%
     B-1        055240DK8         960.864157      5.290627      2.490109       7.780736    958.374048     6.607334%      6.607517%
     B-2        055240DL6         960.864167      5.290626      2.490108       7.780734    958.374059     6.607334%      6.607517%
     B-3        055240DM4         960.864144      5.290624      2.490107       7.780731    958.374036     6.607334%      6.607517%
     B-4        055240DN2         960.864126      5.290634      2.490112       7.780746    958.374014     6.607334%      6.607517%
     B-5        055240DP7         960.864141      5.290631      2.490118       7.780750    958.374022     6.607334%      6.607517%
     R-II       055240DR3           0.000000      0.000000      0.000000       0.000000      0.000000     6.750000%      6.750000%

------------------------------------------------------------------------------------------------------------------------------------
SELLER:                                    Bank of America                      ADMINISTRATOR:               Kelly L. Shea
SERVICER:                                  Bank of America                                                   Deutsche Bank
LEAD UNDERWRITER:                    Donaldson, Lufkin & Jenrette                                       1761 E. St. Andrew Place
RECORD DATE:                              September 30, 1999                                              Santa Ana, CA 92705
DISTRIBUTION DATE:                         October 25, 1999                     FACTOR INFORMATION:          (800) 735-7777
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                                    Page 3 of 5 (C) COPYRIGHT 1999 Deutsche Bank


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1

                         STATEMENT TO CERTIFICATEHOLDERS

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
Distribution Date:            October 25, 1999
------------------------------------------------------------------------------------------------------------------------------------


MORTGAGE POOL INFORMATION:                                                  GROUP I                     GROUP II
--------------------------                                                  -------                     --------

<S>                                                                       <C>                         <C>
                BEGINNING BALANCE OF POOL                                 97,422,022.98               138,970,295.33
                LESS:         SCHEDULED PRINCIPAL                            (87,543.03)                (537,165.17)
                              PRINCIPAL PREPAYMENTS                       (1,170,715.35)                 (54,345.88)
                              REPURCHASES                                          0.00                        0.00
                              LIQUIDATIONS                                         0.00                        0.00
                              OTHER UNSCHEDULED PRINCIPAL                          0.00                        0.00
                                                                          -------------               --------------
                ENDING BALANCE OF POOL                                    96,163,764.60               138,378,784.28
                                                                          =============               ==============

                BEGINNING NUMBER OF LOANS IN POOL                                   306                         426
                ENDING NUMBER OF LOANS IN POOL                                      303                         426

                WEIGHTED AVERAGE REMAINING TERM TO MATURITY                         332                         157
                WEIGHTED AVERAGE NET CONTRACT RATE                            7.512105%                   7.071856%

                CURRENT REALIZED LOSSES ON THE POOL                                0.00                        0.00
                CUMULATIVE REALIZED LOSSES ON THE POOL                             0.00                        0.00

                BEGINNING POOL BALANCE OF PREMIUM LOANS                   95,884,663.90               127,591,388.85
                STRIPPED INTEREST RATE                                        0.521806%                   0.218347%

</TABLE>

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
DELINQUENT, BANKRUPTCY,                                                                     LOANS         LOANS         LOANS
FORECLOSURE, AND REO                           30 TO 59      60 TO 89       90 PLUS          IN            IN             IN
LOAN INFORMATION                                 DAYS          DAYS           DAYS       BANKRUPTCY    FORECLOSURE       REO
------------------------------------------------------------------------------------------------------------------------------------
<S>                                                <C>           <C>            <C>           <C>           <C>            <C>
GROUP I         PRINCIPAL BALANCE                     0.00          0.00           0.00          0.00          0.00           0.00
                     PERCENTAGE OF GROUP BAL.      0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
                NUMBER OF LOANS                          0             0              0             0             0              0
                     PERCENTAGE OF LOANS           0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
GROUP II        PRINCIPAL BALANCE                     0.00          0.00           0.00          0.00          0.00           0.00
                     PERCENTAGE OF GROUP BAL.      0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
                NUMBER OF LOANS                          0             0              0             0             0              0
                     PERCENTAGE OF LOANS           0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
------------------------------------------------------------------------------------------------------------------------------------
                GROUP I BOOK VALUE OF REO PROPERTIES                                                             NA
                GROUP II BOOK VALUE OF REO PROPERTIES                                                            NA
</TABLE>

<TABLE>
<CAPTION>
SERVICING INFORMATION:                                                      GROUP I                     GROUP II
----------------------                                                      -------                     --------

<S>                                                                           <C>                         <C>
                SERVICING FEES ACCRUED DURING THE CURRENT DUE PERIOD          20,296.25                   44,787.84
                PLUS:         ADDITIONAL SERVICING COMPENSATION                    0.00                        0.00
                LESS:         AMTS. TO COVER PREPAYMENT INT. SHORTFALL        (3,711.62)                       0.00
                              DELINQUENT SERVICING FEES                       (1,968.31)                   2,674.14
                                                                          -------------               --------------
                SERVICING FEES COLLECTED FOR THE CURRENT DUE PERIOD           14,616.32                   47,461.98
                                                                          =============               ==============
                ADVANCED PRINCIPAL                                             8,112.55                   31,119.63
                ADVANCED INTEREST                                             56,998.87                   46,196.81
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                                    Page 4 of 5 (C) COPYRIGHT 1999 Deutsche Bank


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1

                         STATEMENT TO CERTIFICATEHOLDERS

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
Distribution Date:            October 25, 1999
------------------------------------------------------------------------------------------------------------------------------------
                                                 OTHER                                   CUMULATIVE
                                PREPAYMENT    UNSCHEDULED                 CERTIFICATE      UNPAID                     CUMULATIVE
                                PRINCIPAL      PRINCIPAL                    INTEREST      INTEREST                     REALIZED
     CLASS                     DISTRIBUTED    DISTRIBUTED                  SHORTFALL      SHORTFALL                     LOSSES
------------------------------------------------------------------------------------------------------------------------------------
<S>                             <C>                   <C>                          <C>           <C>                          <C>
       CLASS IA-1               1,170,696.38          0.00                         0.00          0.00                         0.00
       CLASS IA-2                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-3                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-4                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-5                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-6                       0.00          0.00                         0.00          0.00                         0.00
       CLASS I-X                        0.00          0.00                         0.00          0.00                         0.00
       CLASS I-PO                      18.97          0.00                         0.00          0.00                         0.00
       CLASS IIA-1                 33,858.10          0.00                         0.00          0.00                         0.00
       CLASS IIA-2                    306.01          0.00                         0.00          0.00                         0.00
       CLASS IIA-3                      0.00          0.00                         0.00          0.00                         0.00
       CLASS IIA-4                  5,167.77          0.00                         0.00          0.00                         0.00
       CLASS IIA-5                 14,864.31          0.00                         0.00          0.00                         0.00
       CLASS IIA-6                      0.00          0.00                         0.00          0.00                         0.00
       CLASS II-X                       0.00          0.00                         0.00          0.00                         0.00
       CLASS II-PO                    149.68          0.00                         0.00          0.00                         0.00
       CLASS M                          0.00          0.00                         0.00          0.00                         0.00
       CLASS B-1                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-2                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-3                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-4                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-5                        0.00          0.00                         0.00          0.00                         0.00
------------------------------------------------------------------------------------------------------------------------------------
    TOTALS                      1,225,061.23          0.00                         0.00          0.00                         0.00
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>

<S>                                                                                                          <C>
                OTHER REPORTING ITEMS:


                GROUP I PERCENTAGE                                                                           96.00%
                GROUP I PREPAYMENT PERCENTAGE                                                               100.00%
                GROUP II PERCENTAGE                                                                          96.27%
                GROUP II PREPAYMENT PERCENTAGE                                                              100.00%

                SUBORDINATE PRINCIPAL DISTRIBUTION AMOUNT                                                 23,512.14
                HAS THE CREDIT SUPPORT DEPLETION DATE OCCURRED                                                   No

                BANKRUPTCY AMOUNT                                                                        100,000.00
                FRAUD LOSS AMOUNT                                                                        119,926.36
                SPECIAL HAZARD AMOUNT                                                                  4,500,664.47
                EXTRAORDINARY LOSSES FOR THE PRIOR PERIOD                                                      0.00

                GROUP I EXTRAORDINARY LOSSES                                                                   0.00
                GROUP II EXTRAORDINARY LOSSES                                                                  0.00

------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                                    Page 5 of 5 (C) COPYRIGHT 1999 Deutsche Bank


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1
                         STATEMENT TO CERTIFICATEHOLDERS

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                                                     DISTRIBUTIONS IN DOLLARS
                                         PRIOR                                                                               CURRENT
                     ORIGINAL        PRINCIPAL                                                 REALIZED      DEFERRED      PRINCIPAL
     CLASS         FACE VALUE          BALANCE      INTEREST     PRINCIPAL          TOTAL        LOSSES      INTEREST        BALANCE
------------------------------------------------------------------------------------------------------------------------------------
<S>            <C>              <C>             <C>           <C>            <C>                   <C>           <C>  <C>
     P1-M           21,501.00        21,146.34          0.00         20.71          20.71          0.00          0.00      21,125.64
     P2-M          350,133.00       326,673.37          0.00      1,359.34       1,359.34          0.00          0.00     325,314.03
     X1-M *    142,084,361.67    94,627,880.14     41,126.57          0.00      41,126.57          0.00          0.00  93,940,838.70
     X2-M *    187,559,494.52   127,058,671.31     23,118.72          0.00      23,118.72          0.00          0.00 126,057,600.48
     Y1             71,698.81        47,442.19        266.88         59.56         326.44          0.00          0.00      47,382.63
     Y2             99,676.65        62,871.45        340.55        265.26         605.81          0.00          0.00      62,606.19
     Z1        143,556,266.44    96,095,176.01    540,535.37    688,619.05   1,229,154.42          0.00          0.00  95,406,556.96
     Z2        199,253,620.42   137,989,239.22    747,441.71  1,046,182.83   1,793,624.54          0.00          0.00 136,943,056.39
     R-I                50.00             0.00          0.00          0.00           0.00          0.00          0.00           0.00

------------------------------------------------------------------------------------------------------------------------------------
TOTALS         343,352,946.32   234,542,548.58  1,352,829.80  1,736,506.75   3,089,336.55          0.00          0.00 232,806,041.84
------------------------------------------------------------------------------------------------------------------------------------
  *Notional Class Balance
</TABLE>


<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                            FACTOR INFORMATION PER $1000 OF ORIGINAL FACE                                     PASS-THROUGH
                                       PRIOR                                                  CURRENT            RATES
                                   PRINCIPAL                                                PRINCIPAL
     CLASS          CUSIP            BALANCE      INTEREST     PRINCIPAL          TOTAL       BALANCE       CURRENT           NEXT
------------------------------------------------------------------------------------------------------------------------------------
<S>             <C>                 <C>           <C>           <C>            <C>           <C>          <C>            <C>
     P1-M                         983.504953      0.000000      0.962978       0.962978    982.542207     0.000000%      0.000000%
     P2-M                         932.997946      0.000000      3.882353       3.882353    929.115593     0.000000%      0.000000%
     X1-M *                       665.997855      0.289452      0.000000       0.289452    661.162408     0.521536%      0.521536%
     X2-M *                       677.431295      0.123261      0.000000       0.123261    672.093944     0.218344%      0.218344%
     Y1                           661.687249      3.722237      0.830690       4.552927    660.856552     6.750000%      6.750000%
     Y2                           630.754053      3.416547      2.661226       6.077774    628.092848     6.500000%      6.500000%
     Z1                           669.390326      3.765321      4.796858       8.562179    664.593468     6.750000%      6.750000%
     Z2                           692.530650      3.751208      5.250509       9.001716    687.280141     6.500000%      6.500000%
     R-I        055240DQ5           0.000000      0.000000      0.000000       0.000000      0.000000     6.750000%      6.750000%

------------------------------------------------------------------------------------------------------------------------------------
SELLER:                                    Bank of America                      ADMINISTRATOR:               Kelly L. Shea
SERVICER:                                  Bank of America                                                   Deutsche Bank
LEAD UNDERWRITER:                    Donaldson, Lufkin & Jenrette                                       1761 E. St. Andrew Place
RECORD DATE:                               October 29, 1999                                               Santa Ana, CA 92705
DISTRIBUTION DATE:                        November 26, 1999                          FACTOR INFORMATION:     (800) 735-7777
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                                    Page 1 of 5 (C) COPYRIGHT 1999 Deutsche Bank


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1
                         STATEMENT TO CERTIFICATEHOLDERS

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                                                     DISTRIBUTIONS IN DOLLARS
                                       PRIOR                                                                               CURRENT
                     ORIGINAL      PRINCIPAL                                                 REALIZED      DEFERRED      PRINCIPAL
     CLASS         FACE VALUE        BALANCE      INTEREST     PRINCIPAL          TOTAL        LOSSES      INTEREST        BALANCE
------------------------------------------------------------------------------------------------------------------------------------
<S>            <C>            <C>             <C>           <C>            <C>                   <C>           <C>  <C>
     IA-1       96,101,504.00  48,674,876.00    273,796.18    685,079.43     958,875.61          0.00          0.00  47,989,796.57
     IA-2        5,000,000.00   5,000,000.00     28,125.00          0.00      28,125.00          0.00          0.00   5,000,000.00
     IA-3        9,500,000.00   9,500,000.00     53,437.50          0.00      53,437.50          0.00          0.00   9,500,000.00
     IA-4       14,250,000.00  14,250,000.00     80,156.25          0.00      80,156.25          0.00          0.00  14,250,000.00
     IA-5        4,887,000.00   4,887,000.00     27,489.38          0.00      27,489.38          0.00          0.00   4,887,000.00
     IA-6        9,939,000.00   9,939,000.00     55,906.88          0.00      55,906.88          0.00          0.00   9,939,000.00
     I-X *      11,983,709.00   7,311,390.59     41,126.58          0.00      41,126.58          0.00          0.00   7,243,378.42
     I-PO           21,501.00      21,146.34          0.00         20.70          20.70          0.00          0.00      21,125.64
     IIA-1     121,111,453.00  83,023,564.09    449,710.97    641,217.70   1,090,928.67          0.00          0.00  82,382,346.39
     IIA-2       1,000,000.00     556,815.47      3,016.08      6,670.74       9,686.82          0.00          0.00     550,144.73
     IIA-3       8,262,000.00   8,262,000.00     44,752.50          0.00      44,752.50          0.00          0.00   8,262,000.00
     IIA-4      14,913,749.00  14,005,414.29     75,862.66     54,473.64     130,336.30          0.00          0.00  13,950,940.65
     IIA-5      46,447,250.00  27,046,893.53    146,504.01    324,026.36     470,530.37          0.00          0.00  26,722,867.17
     IIA-6       2,127,000.00           0.00          0.00          0.00           0.00          0.00          0.00           0.00
     II-X *      7,513,508.12   4,268,072.15     23,118.72          0.00      23,118.72          0.00          0.00   4,241,892.02
     II-PO         350,133.00     326,673.37          0.00      1,359.34       1,359.34          0.00          0.00     325,314.03


------------------------------------------------------------------------------------------------------------------------------------
TOTALS         333,910,590.00 225,493,383.09  1,303,002.71  1,712,847.91   3,015,850.62          0.00          0.00 223,780,535.18
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
  *Notional Class Balance

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                            FACTOR INFORMATION PER $1000 OF ORIGINAL FACE                                     PASS-THROUGH
                                       PRIOR                                                  CURRENT            RATES
                                   PRINCIPAL                                                PRINCIPAL
     CLASS          CUSIP            BALANCE      INTEREST     PRINCIPAL          TOTAL       BALANCE       CURRENT           NEXT
------------------------------------------------------------------------------------------------------------------------------------
<S>             <C>               <C>             <C>           <C>            <C>         <C>            <C>            <C>
     IA-1       055240CT0         506.494425      2.849031      7.128707       9.977738    499.365718     6.750000%      6.750000%
     IA-2       055240CU7       1,000.000000      5.625000      0.000000       5.625000  1,000.000000     6.750000%      6.750000%
     IA-3       055240CV5       1,000.000000      5.625000      0.000000       5.625000  1,000.000000     6.750000%      6.750000%
     IA-4       055240CW3       1,000.000000      5.625000      0.000000       5.625000  1,000.000000     6.750000%      6.750000%
     IA-5       055240CX1       1,000.000000      5.625001      0.000000       5.625001  1,000.000000     6.750000%      6.750000%
     IA-6       055240CY9       1,000.000000      5.625001      0.000000       5.625001  1,000.000000     6.750000%      6.750000%
     I-X *      055240DF9         610.110825      5.625001      0.000000       5.625001    604.435440     6.750000%      0.000000%
     I-PO       055240DH5         983.504953      0.000000      0.962746       0.962746    982.542207     0.000000%      6.500000%
     IIA-1      055240CZ6         685.513732      3.713199      5.294443       9.007643    680.219289     6.500000%      6.500000%
     IIA-2      055240DA0         556.815470      3.016080      6.670740       9.686820    550.144730     6.500000%      6.500000%
     IIA-3      055240DB8       1,000.000000      5.416667      0.000000       5.416667  1,000.000000     6.500000%      6.500000%
     IIA-4      055240DC6         939.094140      5.086760      3.652578       8.739338    935.441561     6.500000%      6.500000%
     IIA-5      055240DD4         582.314207      3.154202      6.976223      10.130425    575.337984     6.500000%      6.500000%
     IIA-6      055240DE2           0.000000      0.000000      0.000000       0.000000      0.000000     6.500000%      6.500000%
     II-X *     055240DG7         568.053176      3.076954      0.000000       3.076954    564.568768     6.500000%      0.000000%
     II-PO      055240DU6         932.997946      0.000000      3.882353       3.882353    929.115593     0.000000%      0.000000%



------------------------------------------------------------------------------------------------------------------------------------
SELLER:                                    Bank of America                      ADMINISTRATOR:               Kelly L. Shea
SERVICER:                                  Bank of America                                                   Deutsche Bank
LEAD UNDERWRITER:                    Donaldson, Lufkin & Jenrette                                       1761 E. St. Andrew Place
RECORD DATE:                               October 29, 1999                                               Santa Ana, CA 92705
DISTRIBUTION DATE:                        November 26, 1999                          FACTOR INFORMATION:     (800) 735-7777
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                                    Page 2 of 5 (C) COPYRIGHT 1999 Deutsche Bank


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1
                         STATEMENT TO CERTIFICATEHOLDERS


<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                                                     DISTRIBUTIONS IN DOLLARS
                                       PRIOR                                                                               CURRENT
                     ORIGINAL      PRINCIPAL                                                 REALIZED      DEFERRED      PRINCIPAL
     CLASS         FACE VALUE        BALANCE      INTEREST     PRINCIPAL          TOTAL        LOSSES      INTEREST        BALANCE
------------------------------------------------------------------------------------------------------------------------------------
<S>              <C>            <C>              <C>           <C>            <C>                <C>           <C>    <C>
     M           3,776,882.00   3,619,665.72     19,930.83      9,463.53      29,394.36          0.00          0.00   3,610,202.19
     B-1         2,231,794.00   2,138,893.45     11,777.31      5,592.09      17,369.40          0.00          0.00   2,133,301.36
     B-2         1,201,735.00   1,151,711.65      6,341.63      3,011.12       9,352.75          0.00          0.00   1,148,700.53
     B-3         1,030,060.00     987,182.76      5,435.69      2,580.97       8,016.66          0.00          0.00     984,601.79
     B-4           515,029.00     493,590.41      2,717.84      1,290.48       4,008.32          0.00          0.00     492,299.93
     B-5           686,706.32     658,121.50      3,623.79      1,720.64       5,344.43          0.00          0.00     656,400.86
     R-II               50.00           0.00          0.00          0.00           0.00          0.00          0.00           0.00

------------------------------------------------------------------------------------------------------------------------------------
TOTALS           9,442,256.32   9,049,165.49     49,827.09     23,658.83      73,485.92          0.00          0.00   9,025,506.66
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>


<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                            FACTOR INFORMATION PER $1000 OF ORIGINAL FACE                                     PASS-THROUGH
                                       PRIOR                                                  CURRENT            RATES
                                   PRINCIPAL                                                PRINCIPAL
     CLASS          CUSIP            BALANCE      INTEREST     PRINCIPAL          TOTAL       BALANCE       CURRENT           NEXT
------------------------------------------------------------------------------------------------------------------------------------
<S>             <C>               <C>             <C>           <C>            <C>         <C>            <C>            <C>
     M          055240DJ1         958.374056      5.277059      2.505646       7.782705    955.868409     6.607517%      6.607699%
     B-1        055240DK8         958.374048      5.277060      2.505648       7.782708    955.868400     6.607517%      6.607699%
     B-2        055240DL6         958.374059      5.277062      2.505644       7.782706    955.868415     6.607517%      6.607699%
     B-3        055240DM4         958.374036      5.277062      2.505650       7.782712    955.868386     6.607517%      6.607699%
     B-4        055240DN2         958.374014      5.277062      2.505645       7.782707    955.868369     6.607517%      6.607699%
     B-5        055240DP7         958.374022      5.277059      2.505645       7.782704    955.868381     6.607517%      6.607699%
     R-II       055240DR3           0.000000      0.000000      0.000000       0.000000      0.000000     6.750000%      6.750000%


------------------------------------------------------------------------------------------------------------------------------------
SELLER:                                    Bank of America                      ADMINISTRATOR:               Kelly L. Shea
SERVICER:                                  Bank of America                                                   Deutsche Bank
LEAD UNDERWRITER:                    Donaldson, Lufkin & Jenrette                                       1761 E. St. Andrew Place
RECORD DATE:                               October 29, 1999                                               Santa Ana, CA 92705
DISTRIBUTION DATE:                        November 26, 1999                          FACTOR INFORMATION:     (800) 735-7777
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                                    Page 3 of 5 (C) COPYRIGHT 1999 Deutsche Bank


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1

                         STATEMENT TO CERTIFICATEHOLDERS

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
Distribution Date:            November 26, 1999
------------------------------------------------------------------------------------------------------------------------------------

MORTGAGE POOL INFORMATION:                                                  GROUP I                     GROUP II
--------------------------                                                  -------                     --------

<S>                                                                       <C>                         <C>
                BEGINNING BALANCE OF POOL                                 96,163,764.60               138,378,784.28
                LESS:         SCHEDULED PRINCIPAL                            (88,935.95)                (538,240.80)
                              PRINCIPAL PREPAYMENTS                         (599,763.38)                (509,566.62)
                              REPURCHASES                                          0.00                        0.00
                              LIQUIDATIONS                                         0.00                        0.00
                              OTHER UNSCHEDULED PRINCIPAL                          0.00                        0.00
                                                                          -------------               --------------
                ENDING BALANCE OF POOL                                    95,475,065.27               137,330,976.86
                                                                          =============               ==============

                BEGINNING NUMBER OF LOANS IN POOL                                   303                         426
                ENDING NUMBER OF LOANS IN POOL                                      301                         424

                WEIGHTED AVERAGE REMAINING TERM TO MATURITY                         331                         156
                WEIGHTED AVERAGE NET CONTRACT RATE                            7.511722%                   7.071886%

                CURRENT REALIZED LOSSES ON THE POOL                                0.00                        0.00
                CUMULATIVE REALIZED LOSSES ON THE POOL                             0.00                        0.00

                BEGINNING POOL BALANCE OF PREMIUM LOANS                   94,627,880.14               127,058,671.31
                STRIPPED INTEREST RATE                                        0.521536%                   0.218344%
</TABLE>

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
DELINQUENT, BANKRUPTCY,                                                                     LOANS         LOANS         LOANS
FORECLOSURE, AND REO                           30 TO 59      60 TO 89       90 PLUS          IN            IN             IN
LOAN INFORMATION                                 DAYS          DAYS           DAYS       BANKRUPTCY    FORECLOSURE       REO
------------------------------------------------------------------------------------------------------------------------------------

<S>                                                <C>           <C>            <C>           <C>           <C>            <C>
GROUP I         PRINCIPAL BALANCE                     0.00          0.00           0.00          0.00          0.00           0.00
                     PERCENTAGE OF GROUP BAL.      0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
                NUMBER OF LOANS                          0             0              0             0             0              0
                     PERCENTAGE OF LOANS           0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
GROUP II        PRINCIPAL BALANCE                     0.00          0.00           0.00          0.00          0.00           0.00
                     PERCENTAGE OF GROUP BAL.      0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
                NUMBER OF LOANS                          0             0              0             0             0              0
                     PERCENTAGE OF LOANS           0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
------------------------------------------------------------------------------------------------------------------------------------
                GROUP I BOOK VALUE OF REO PROPERTIES                                                             NA
                GROUP II BOOK VALUE OF REO PROPERTIES                                                            NA
</TABLE>


<TABLE>
<CAPTION>
SERVICING INFORMATION:                                                      GROUP I                     GROUP II
----------------------                                                      -------                     --------

<S>                                                                           <C>                         <C>
                SERVICING FEES ACCRUED DURING THE CURRENT DUE PERIOD          20,034.11                   44,598.22
                PLUS:         ADDITIONAL SERVICING COMPENSATION                    0.00                        0.00
                LESS:         AMTS. TO COVER PREPAYMENT INT. SHORTFALL        (3,212.58)                    (729.60)
                              DELINQUENT SERVICING FEES                         (598.41)                     308.60
                                                                          -------------               --------------
                SERVICING FEES COLLECTED FOR THE CURRENT DUE PERIOD           16,223.12                   44,177.22
                                                                          =============               ==============

                ADVANCED PRINCIPAL                                             2,617.94                    4,173.54
                ADVANCED INTEREST                                             17,453.27                    5,668.60
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                                    Page 4 of 5 (C) COPYRIGHT 1999 Deutsche Bank


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1

                         STATEMENT TO CERTIFICATEHOLDERS

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
Distribution Date:            November 26, 1999
------------------------------------------------------------------------------------------------------------------------------------
                                                 OTHER                                   CUMULATIVE
                                PREPAYMENT    UNSCHEDULED                 CERTIFICATE      UNPAID                     CUMULATIVE
                                PRINCIPAL      PRINCIPAL                    INTEREST      INTEREST                     REALIZED
     CLASS                     DISTRIBUTED    DISTRIBUTED                  SHORTFALL      SHORTFALL                     LOSSES
------------------------------------------------------------------------------------------------------------------------------------

<S>                               <C>                 <C>                          <C>           <C>                          <C>
       CLASS IA-1                 599,745.26          0.00                         0.00          0.00                         0.00
       CLASS IA-2                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-3                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-4                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-5                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-6                       0.00          0.00                         0.00          0.00                         0.00
       CLASS I-X                        0.00          0.00                         0.00          0.00                         0.00
       CLASS I-PO                      18.12          0.00                         0.00          0.00                         0.00
       CLASS IIA-1                317,921.52          0.00                         0.00          0.00                         0.00
       CLASS IIA-2                  3,307.41          0.00                         0.00          0.00                         0.00
       CLASS IIA-3                      0.00          0.00                         0.00          0.00                         0.00
       CLASS IIA-4                 27,008.52          0.00                         0.00          0.00                         0.00
       CLASS IIA-5                160,655.19          0.00                         0.00          0.00                         0.00
       CLASS IIA-6                      0.00          0.00                         0.00          0.00                         0.00
       CLASS II-X                       0.00          0.00                         0.00          0.00                         0.00
       CLASS II-PO                    673.97          0.00                         0.00          0.00                         0.00
       CLASS M                          0.00          0.00                         0.00          0.00                         0.00
       CLASS B-1                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-2                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-3                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-4                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-5                        0.00          0.00                         0.00          0.00                         0.00
------------------------------------------------------------------------------------------------------------------------------------
    TOTALS                      1,109,330.00          0.00                         0.00          0.00                         0.00
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>


<TABLE>
<CAPTION>

<S>                                                                                                          <C>
                OTHER REPORTING ITEMS:

                GROUP I PERCENTAGE                                                                           95.95%
                GROUP I PREPAYMENT PERCENTAGE                                                               100.00%
                GROUP II PERCENTAGE                                                                          96.26%
                GROUP II PREPAYMENT PERCENTAGE                                                              100.00%

                SUBORDINATE PRINCIPAL DISTRIBUTION AMOUNT                                                 23,658.84
                HAS THE CREDIT SUPPORT DEPLETION DATE OCCURRED                                                   No

                BANKRUPTCY AMOUNT                                                                        100,000.00
                FRAUD LOSS AMOUNT                                                                        119,926.36
                SPECIAL HAZARD AMOUNT                                                                  4,500,664.47
                EXTRAORDINARY LOSSES FOR THE PRIOR PERIOD                                                      0.00

                GROUP I EXTRAORDINARY LOSSES                                                                   0.00
                GROUP II EXTRAORDINARY LOSSES                                                                  0.00

------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                                    Page 5 of 5 (C) COPYRIGHT 1999 Deutsche Bank


<PAGE>

                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1
                                     REMIC I
                         STATEMENT TO CERTIFICATEHOLDERS


<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                                                     DISTRIBUTIONS IN DOLLARS
                                       PRIOR                                                                               CURRENT
                     ORIGINAL      PRINCIPAL                                                 REALIZED      DEFERRED      PRINCIPAL
     CLASS         FACE VALUE        BALANCE      INTEREST     PRINCIPAL          TOTAL        LOSSES      INTEREST        BALANCE
------------------------------------------------------------------------------------------------------------------------------------
<S>            <C>            <C>             <C>          <C>            <C>                    <C>           <C>  <C>
     P1-M           21,501.00      21,346.52          0.00         19.86          19.86          0.00          0.00      21,326.66
     P2-M          350,133.00     340,237.26          0.00      1,281.25       1,281.25          0.00          0.00     338,956.01
     X1-M *    142,084,361.67 121,167,038.91     55,023.82          0.00      55,023.82          0.00          0.00 114,250,923.50
     X2-M *    187,559,494.52 160,764,305.96     32,186.44          0.00      32,186.44          0.00          0.00 154,169,846.68
     Y1             71,698.81      58,323.18        328.08      3,892.40       4,220.48          0.00          0.00      54,430.78
     Y2             99,676.65      79,466.65        430.44      5,496.64       5,927.08          0.00          0.00      73,970.01
     Z1        143,556,266.44 122,638,967.26    689,844.19  6,913,971.07   7,603,815.26          0.00          0.00 115,724,996.19
     Z2        199,253,620.42 172,144,665.67    932,450.27  6,632,450.98   7,564,901.25          0.00          0.00 165,512,214.69
     R-I                50.00           0.00          0.00          0.00           0.00          0.00          0.00           0.00

------------------------------------------------------------------------------------------------------------------------------------
TOTALS         343,352,946.32 295,283,006.54  1,710,263.24 13,557,112.20  15,267,375.44          0.00          0.00 281,725,894.34
------------------------------------------------------------------------------------------------------------------------------------
  *Notional Class Balance
</TABLE>

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                            FACTOR INFORMATION PER $1000 OF ORIGINAL FACE                                     PASS-THROUGH
                                       PRIOR                                                  CURRENT            RATES
                                   PRINCIPAL                                                PRINCIPAL
     CLASS          CUSIP            BALANCE      INTEREST     PRINCIPAL          TOTAL       BALANCE       CURRENT           NEXT
------------------------------------------------------------------------------------------------------------------------------------
<S>             <C>                 <C>           <C>           <C>            <C>           <C>          <C>            <C>
     P1-M                         992.815218      0.000000      0.923678       0.923678    991.891540     0.000000%      0.000000%
     P2-M                         971.737197      0.000000      3.659324       3.659324    968.077873     0.000000%      0.000000%
     X1-M *                       852.782372      0.387262      0.000000       0.387262    804.106252     0.544938%      0.544938%
     X2-M *                       857.137658      0.171607      0.000000       0.171607    821.978365     0.240251%      0.240251%
     Y1                           813.446945      4.575808     54.288182      58.863990    759.158738     6.750000%      6.750000%
     Y2                           797.244402      4.318363     55.144716      59.463079    742.099690     6.500000%      6.500000%
     Z1                           854.291981      4.805392     48.162099      52.967491    806.129882     6.750000%      6.750000%
     Z2                           863.947492      4.679716     33.286477      37.966192    830.661016     6.500000%      6.500000%
     R-I        055240DQ5           0.000000      0.000000      0.000000       0.000000      0.000000     6.750000%      6.750000%


------------------------------------------------------------------------------------------------------------------------------------
SELLER:                                    Bank of America                      ADMINISTRATOR:               Kelly L. Shea
SERVICER:                                  Bank of America                                               Bankers Trust Company
LEAD UNDERWRITER:                    Donaldson, Lufkin & Jenrette                                             3 Park Plaza
RECORD DATE:                              December 31, 1998                                                 Irvine, CA 92614
DISTRIBUTION DATE:                         January 25, 1999                          FACTOR INFORMATION:     (800) 735-7777
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                            Page 1 of 5 (C) COPYRIGHT 1999 Bankers Trust Company


<PAGE>



                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1
                                    REMIC II
                         STATEMENT TO CERTIFICATEHOLDERS

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                                                     DISTRIBUTIONS IN DOLLARS
                                       PRIOR                                                                               CURRENT
                     ORIGINAL      PRINCIPAL                                                 REALIZED      DEFERRED      PRINCIPAL
     CLASS         FACE VALUE        BALANCE      INTEREST     PRINCIPAL          TOTAL        LOSSES      INTEREST        BALANCE
------------------------------------------------------------------------------------------------------------------------------------
<S>            <C>            <C>             <C>          <C>            <C>                    <C>           <C>  <C>
     IA-1       96,101,504.00  75,196,067.53    422,977.88  6,914,730.53   7,337,708.41          0.00          0.00  68,281,337.00
     IA-2        5,000,000.00   5,000,000.00     28,125.00          0.00      28,125.00          0.00          0.00   5,000,000.00
     IA-3        9,500,000.00   9,500,000.00     53,437.50          0.00      53,437.50          0.00          0.00   9,500,000.00
     IA-4       14,250,000.00  14,250,000.00     80,156.25          0.00      80,156.25          0.00          0.00  14,250,000.00
     IA-5        4,887,000.00   4,887,000.00     27,489.38          0.00      27,489.38          0.00          0.00   4,887,000.00
     IA-6        9,939,000.00   9,939,000.00     55,906.88          0.00      55,906.88          0.00          0.00   9,939,000.00
     I-X *      11,983,709.00   9,782,011.87     55,023.81          0.00      55,023.81          0.00          0.00   9,109,610.04
     I-PO           21,501.00      21,346.52          0.00         19.86          19.86          0.00          0.00      21,326.66
     IIA-1     121,111,453.00 104,252,732.40    564,702.30  4,135,576.37   4,700,278.67          0.00          0.00 100,117,156.03
     IIA-2       1,000,000.00     803,372.95      4,351.60     49,144.33      53,495.93          0.00          0.00     754,228.62
     IIA-3       8,262,000.00   8,262,000.00     44,752.50          0.00      44,752.50          0.00          0.00   8,262,000.00
     IIA-4      14,913,749.00  14,534,583.84     78,729.00     47,890.84     126,619.84          0.00          0.00  14,486,693.00
     IIA-5      46,447,250.00  39,023,238.54    211,375.88  2,387,149.19   2,598,525.07          0.00          0.00  36,636,089.35
     IIA-6       2,127,000.00           0.00          0.00          0.00           0.00          0.00          0.00           0.00
     II-X *      7,513,508.12   5,942,112.23     32,186.44          0.00      32,186.44          0.00          0.00   5,611,587.52
     II-PO         350,133.00     340,237.26          0.00      1,281.25       1,281.25          0.00          0.00     338,956.01


------------------------------------------------------------------------------------------------------------------------------------
TOTALS         333,910,590.00 286,009,579.04  1,659,214.42 13,535,792.37  15,195,006.79          0.00          0.00 272,473,786.67
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
  *Notional Class Balance


<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                            FACTOR INFORMATION PER $1000 OF ORIGINAL FACE                                     PASS-THROUGH
                                       PRIOR                                                  CURRENT            RATES
                                   PRINCIPAL                                                PRINCIPAL
     CLASS          CUSIP            BALANCE      INTEREST     PRINCIPAL          TOTAL       BALANCE       CURRENT           NEXT
------------------------------------------------------------------------------------------------------------------------------------
<S>     <C>     <C>     <C>       <C>             <C>          <C>            <C>          <C>            <C>            <C>
     IA-1       055240CT0         782.465044      4.401366     71.952365      76.353731    710.512678     6.750000%      6.750000%
     IA-2       055240CU7       1,000.000000      5.625000      0.000000       5.625000  1,000.000000     6.750000%      6.750000%
     IA-3       055240CV5       1,000.000000      5.625000      0.000000       5.625000  1,000.000000     6.750000%      6.750000%
     IA-4       055240CW3       1,000.000000      5.625000      0.000000       5.625000  1,000.000000     6.750000%      6.750000%
     IA-5       055240CX1       1,000.000000      5.625001      0.000000       5.625001  1,000.000000     6.750000%      6.750000%
     IA-6       055240CY9       1,000.000000      5.625001      0.000000       5.625001  1,000.000000     6.750000%      6.750000%
     I-X *      055240DF9         816.275818      5.624999      0.000000       5.624999    760.166159     6.750000%      0.000000%
     I-PO       055240DH5         992.815218      0.000000      0.923678       0.923678    991.891540     0.000000%      6.500000%
     IIA-1      055240CZ6         860.799948      4.662666     34.146864      38.809531    826.653083     6.500000%      6.500000%
     IIA-2      055240DA0         803.372950      4.351600     49.144330      53.495930    754.228620     6.500000%      6.500000%
     IIA-3      055240DB8       1,000.000000      5.416667      0.000000       5.416667  1,000.000000     6.500000%      6.500000%
     IIA-4      055240DC6         974.576134      5.278954      3.211187       8.490141    971.364947     6.500000%      6.500000%
     IIA-5      055240DD4         840.162519      4.550880     51.394844      55.945725    788.767674     6.500000%      6.500000%
     IIA-6      055240DE2           0.000000      0.000000      0.000000       0.000000      0.000000     6.500000%      6.500000%
     II-X *     055240DG7         790.857231      4.283810      0.000000       4.283810    746.866502     6.500000%      0.000000%
     II-PO      055240DU6         971.737197      0.000000      3.659324       3.659324    968.077873     0.000000%      0.000000%

------------------------------------------------------------------------------------------------------------------------------------
SELLER:                                    Bank of America                      ADMINISTRATOR:               Kelly L. Shea
SERVICER:                                  Bank of America                                               Bankers Trust Company
LEAD UNDERWRITER:                    Donaldson, Lufkin & Jenrette                                             3 Park Plaza
RECORD DATE:                              December 31, 1998                                                 Irvine, CA 92614
DISTRIBUTION DATE:                         January 25, 1999                     FACTOR INFORMATION:          (800) 735-7777
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                            Page 2 of 5 (C) COPYRIGHT 1999 Bankers Trust Company


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1
                         STATEMENT TO CERTIFICATEHOLDERS

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                                                     DISTRIBUTIONS IN DOLLARS
                                       PRIOR                                                                               CURRENT
                     ORIGINAL      PRINCIPAL                                                 REALIZED      DEFERRED      PRINCIPAL
     CLASS         FACE VALUE        BALANCE      INTEREST     PRINCIPAL          TOTAL        LOSSES      INTEREST        BALANCE
------------------------------------------------------------------------------------------------------------------------------------
<S>              <C>            <C>              <C>           <C>            <C>                <C>           <C>    <C>
     M           3,776,882.00   3,709,370.48     20,419.53      8,527.93      28,947.46          0.00          0.00   3,700,842.55
     B-1         2,231,794.00   2,191,900.83     12,066.08      5,039.23      17,105.31          0.00          0.00   2,186,861.60
     B-2         1,201,735.00   1,180,254.07      6,497.12      2,713.43       9,210.55          0.00          0.00   1,177,540.64
     B-3         1,030,060.00   1,011,647.74      5,568.97      2,325.80       7,894.77          0.00          0.00   1,009,321.94
     B-4           515,029.00     505,822.88      2,784.48      1,162.90       3,947.38          0.00          0.00     504,659.98
     B-5           686,706.32     674,431.50      3,712.64      1,550.54       5,263.18          0.00          0.00     672,880.96
     R-II               50.00           0.00          0.00          0.00           0.00          0.00          0.00           0.00

------------------------------------------------------------------------------------------------------------------------------------
TOTALS           9,442,256.32   9,273,427.50     51,048.82     21,319.83      72,368.65          0.00          0.00   9,252,107.67
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>


<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
                            FACTOR INFORMATION PER $1000 OF ORIGINAL FACE                                     PASS-THROUGH
                                       PRIOR                                                  CURRENT            RATES
                                   PRINCIPAL                                                PRINCIPAL
     CLASS          CUSIP            BALANCE      INTEREST     PRINCIPAL          TOTAL       BALANCE       CURRENT           NEXT
------------------------------------------------------------------------------------------------------------------------------------
<S>             <C>               <C>             <C>           <C>            <C>         <C>            <C>            <C>
     M          055240DJ1         982.125065      5.406452      2.257929       7.664380    979.867136     6.605819%      6.284303%
     B-1        055240DK8         982.125066      5.406449      2.257928       7.664377    979.867138     6.605819%      6.284303%
     B-2        055240DL6         982.125069      5.406450      2.257927       7.664377    979.867142     6.605819%      6.284303%
     B-3        055240DM4         982.125061      5.406452      2.257927       7.664379    979.867134     6.605819%      6.284303%
     B-4        055240DN2         982.125045      5.406453      2.257931       7.664384    979.867114     6.605819%      6.284303%
     B-5        055240DP7         982.125081      5.406445      2.257938       7.664383    979.867140     6.605819%      6.284303%
     R-II       055240DR3           0.000000      0.000000      0.000000       0.000000      0.000000     6.750000%      6.750000%

------------------------------------------------------------------------------------------------------------------------------------
SELLER:                                    Bank of America                      ADMINISTRATOR:               Kelly L. Shea
SERVICER:                                  Bank of America                                               Bankers Trust Company
LEAD UNDERWRITER:                    Donaldson, Lufkin & Jenrette                                             3 Park Plaza
RECORD DATE:                              December 31, 1998                                                 Irvine, CA 92614
DISTRIBUTION DATE:                         January 25, 1999                     FACTOR INFORMATION:          (800) 735-7777
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                            Page 3 of 5 (C) COPYRIGHT 1999 Bankers Trust Company


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1

                         STATEMENT TO CERTIFICATEHOLDERS

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
Distribution Date:            January 25, 1999
------------------------------------------------------------------------------------------------------------------------------------

MORTGAGE POOL INFORMATION:                                                  GROUP I                     GROUP II
--------------------------                                                  -------                     --------

<S>                                                                      <C>                          <C>
                BEGINNING BALANCE OF POOL                                122,718,637.09               172,564,369.77
                LESS:         SCHEDULED PRINCIPAL                            (97,951.12)                (586,875.39)
                              PRINCIPAL PREPAYMENTS                       (6,819,932.22)              (6,052,353.47)
                              REPURCHASES                                          0.00                        0.00
                              LIQUIDATIONS                                         0.00                        0.00
                              OTHER UNSCHEDULED PRINCIPAL                          0.00                        0.00
                                                                         --------------               --------------
                ENDING BALANCE OF POOL                                   115,800,753.75               165,925,140.91
                                                                         ==============               ==============

                BEGINNING NUMBER OF LOANS IN POOL                                   384                         509
                ENDING NUMBER OF LOANS IN POOL                                      362                         492

                WEIGHTED AVERAGE REMAINING TERM TO MATURITY                         341                         167
                WEIGHTED AVERAGE NET CONTRACT RATE                            7.536874%                   7.106808%

                CURRENT REALIZED LOSSES ON THE POOL                                0.00                        0.00
                CUMULATIVE REALIZED LOSSES ON THE POOL                             0.00                        0.00

                BEGINNING POOL BALANCE OF PREMIUM LOANS                  121,167,038.91               160,764,305.96
                STRIPPED INTEREST RATE                                        0.544938%                   0.240251%
</TABLE>

<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
DELINQUENT, BANKRUPTCY,                                                                     LOANS         LOANS         LOANS
FORECLOSURE, AND REO                           30 TO 59      60 TO 89       90 PLUS          IN            IN             IN
LOAN INFORMATION                                 DAYS          DAYS           DAYS       BANKRUPTCY    FORECLOSURE       REO
------------------------------------------------------------------------------------------------------------------------------------
<S>                                                <C>           <C>            <C>           <C>           <C>            <C>
GROUP I         PRINCIPAL BALANCE                     0.00          0.00           0.00          0.00          0.00           0.00
                     PERCENTAGE OF GROUP BAL.      0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
                NUMBER OF LOANS                          0             0              0             0             0              0
                     PERCENTAGE OF LOANS           0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
GROUP II        PRINCIPAL BALANCE                     0.00          0.00           0.00          0.00          0.00           0.00
                     PERCENTAGE OF GROUP BAL.      0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
                NUMBER OF LOANS                          0             0              0             0             0              0
                     PERCENTAGE OF LOANS           0.0000%       0.0000%        0.0000%       0.0000%       0.0000%        0.0000%
------------------------------------------------------------------------------------------------------------------------------------
                GROUP I BOOK VALUE OF REO PROPERTIES                                                             NA
                GROUP II BOOK VALUE OF REO PROPERTIES                                                            NA
</TABLE>


<TABLE>
<CAPTION>
SERVICING INFORMATION:                                                      GROUP I                     GROUP II
----------------------                                                      -------                     --------

<S>                                                                           <C>                         <C>
                SERVICING FEES ACCRUED DURING THE CURRENT DUE PERIOD          25,566.38                   56,917.73
                PLUS:         ADDITIONAL SERVICING COMPENSATION                    0.00                        0.00
                LESS:         AMTS. TO COVER PREPAYMENT INT. SHORTFALL       (20,562.61)                 (16,683.43)
                              DELINQUENT SERVICING FEES                       (1,886.67)                   3,298.23
                                                                         --------------               --------------
                SERVICING FEES COLLECTED FOR THE CURRENT DUE PERIOD            3,117.10                   43,532.53
                                                                         ==============               ==============
                ADVANCED PRINCIPAL                                             7,482.15                   32,810.19
                ADVANCED INTEREST                                             54,827.74                   54,410.41
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                            Page 4 of 5 (C) COPYRIGHT 1999 Bankers Trust Company


<PAGE>


                          BA MORTGAGE SECURITIES, INC.
                       MORTGAGE PASS-THROUGH CERTIFICATES
                                  SERIES 1998-1

                         STATEMENT TO CERTIFICATEHOLDERS
<TABLE>
<CAPTION>
------------------------------------------------------------------------------------------------------------------------------------
Distribution Date:            January 25, 1999
------------------------------------------------------------------------------------------------------------------------------------
                                                 OTHER                                   CUMULATIVE
                                PREPAYMENT    UNSCHEDULED                 CERTIFICATE      UNPAID                     CUMULATIVE
                                PRINCIPAL      PRINCIPAL                    INTEREST      INTEREST                     REALIZED
     CLASS                     DISTRIBUTED    DISTRIBUTED                  SHORTFALL      SHORTFALL                     LOSSES
------------------------------------------------------------------------------------------------------------------------------------
<S>                             <C>                   <C>                          <C>           <C>                          <C>
       CLASS IA-1               6,819,912.63          0.00                         0.00          0.00                         0.00
       CLASS IA-2                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-3                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-4                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-5                       0.00          0.00                         0.00          0.00                         0.00
       CLASS IA-6                       0.00          0.00                         0.00          0.00                         0.00
       CLASS I-X                        0.00          0.00                         0.00          0.00                         0.00
       CLASS I-PO                      19.59          0.00                         0.00          0.00                         0.00
       CLASS IIA-1              3,780,367.21          0.00                         0.00          0.00                         0.00
       CLASS IIA-2                 44,923.27          0.00                         0.00          0.00                         0.00
       CLASS IIA-3                      0.00          0.00                         0.00          0.00                         0.00
       CLASS IIA-4                 43,777.44          0.00                         0.00          0.00                         0.00
       CLASS IIA-5              2,182,114.34          0.00                         0.00          0.00                         0.00
       CLASS IIA-6                      0.00          0.00                         0.00          0.00                         0.00
       CLASS II-X                       0.00          0.00                         0.00          0.00                         0.00
       CLASS II-PO                  1,171.20          0.00                         0.00          0.00                         0.00
       CLASS M                          0.00          0.00                         0.00          0.00                         0.00
       CLASS B-1                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-2                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-3                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-4                        0.00          0.00                         0.00          0.00                         0.00
       CLASS B-5                        0.00          0.00                         0.00          0.00                         0.00
------------------------------------------------------------------------------------------------------------------------------------
    TOTALS                     12,872,285.69          0.00                         0.00          0.00                         0.00
------------------------------------------------------------------------------------------------------------------------------------
</TABLE>

<TABLE>
<CAPTION>
<S>                                                                                                          <C>
                OTHER REPORTING ITEMS:

                GROUP I PERCENTAGE                                                                           96.80%
                GROUP I PREPAYMENT PERCENTAGE                                                               100.00%
                GROUP II PERCENTAGE                                                                          96.89%
                GROUP II PREPAYMENT PERCENTAGE                                                              100.00%

                SUBORDINATE PRINCIPAL DISTRIBUTION AMOUNT                                                 21,319.83
                HAS THE CREDIT SUPPORT DEPLETION DATE OCCURRED                                                   No

                BANKRUPTCY AMOUNT                                                                        100,000.00
                FRAUD LOSS AMOUNT                                                                      5,905,660.14
                SPECIAL HAZARD AMOUNT                                                                  4,500,664.47
                EXTRAORDINARY LOSSES FOR THE PRIOR PERIOD                                                      0.00

                GROUP I EXTRAORDINARY LOSSES                                                                   0.00
                GROUP II EXTRAORDINARY LOSSES                                                                  0.00

------------------------------------------------------------------------------------------------------------------------------------
</TABLE>
                            Page 5 of 5 (C) COPYRIGHT 1999 Bankers Trust Company