<PAGE>



                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                   FORM 10-KSB

                Annual Report Pursuant to Section 13 or 15(d) of
                         Securities Exchange Act of 1934

                                                               Commission File
For the year ended December 31, 1999                           Number  0-12210
                   -----------------                                   -------


                  PRESIDENTIAL ASSOCIATES I LIMITED PARTNERSHIP
                  ---------------------------------------------
        (Exact name of small business issuer as specified in its charter)

       Maryland                                                       36-3110117
-----------------------                                 ------------------------
(State of organization)                        (IRS Employer Identification No.)

5 Cambridge Center, Cambridge, Massachusetts                               02142
--------------------------------------------                            --------
(Address of principal executive offices)                              (Zip Code)

Partnership's telephone number including area code:               (617) 234-3000
                                                                  --------------

Securities registered pursuant to Section 12(b) of the Act: None
                                                            ----

Securities registered pursuant to Section 12(g) of the Act:

                      Units of Limited Partnership Interest
                      -------------------------------------
                                (Title of Class)

Indicate by check mark whether the Partnership (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
Partnership was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days. Yes   X    No

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405
of Regulation S-B is not contained herein, and will not be contained, to the
best of Partnership's knowledge, in definitive proxy or information statements
incorporated by reference in Part III of this Form 10-KSB or any amendment to
this Form 10-KSB. [ ]

The Partnership's revenues for its most recent fiscal year were $444,006.

No market exists for the limited partnership interests of the Partnership, and,
therefore, no aggregate market value can be computed.

                       DOCUMENTS INCORPORATED BY REFERENCE
                                      None


<PAGE>


                                     PART I

Item 1.           Description of Business.

Organization

      Presidential Associates I Limited Partnership (the "Partnership") was
organized as a Maryland limited partnership under the Maryland Revised Uniform
Limited Partnership Act on July 20, 1983, for the purpose of investing in
Presidential Towers Ltd. (the "Operating Partnership"), an Illinois limited
partnership organized for the purpose of building, owning and operating a
residential apartment complex in downtown Chicago, Illinois (the "Project").

      The general partners of the Partnership are Winthrop Financial Co., Inc.,
a Massachusetts corporation ("Winthrop Financial"), and Linnaeus-Phoenix
Associates Limited Partnership ("Linnaeus-Phoenix"). Winthrop Financial is the
Partnership's managing general partner. Collectively, Winthrop Financial and
Linnaeus-Phoenix are referred to herein as the "General Partners." Winthrop
Financial is a wholly-owned subsidiary of First Winthrop Corporation which is
wholly owned by Winthrop Financial Associates, A Limited Partnership ("WFA").
See "Employees" below.

      The only business of the Partnership is investing as a limited partner in
the Operating Partnership. As of the date hereof, the general partners of the
Operating Partnership are (i) McHugh Levin Associates Venture ("McHugh Levin"),
an Illinois limited partnership whose general partners are James P. McHugh and
Daniel E. Levin, (ii) Madison-Canal Company, an Illinois limited partnership
whose general partner is Daniel J. Shannon and (iii) TKI Presidential Partners.

      As of the date hereof, the Partnership holds a 19.998% limited partnership
interest in the Operating Partnership. In exchange for this interest the
Partnership made a capital contribution of $33,172,524 to the Operating
Partnership. See "Restructuring of Operating Partnership."

Development

      The Partnership was initially capitalized with contributions totaling $300
from the General Partners. In September 1983, the Partnership completed a
private offering of 590 units of limited partnership interest (the "Units")
pursuant to Regulation D under the Securities Act of 1933. The Partnership
raised $59,000,000 in capital contributions from 545 investor limited partners
(the "Limited Partners"). Of the $59,000,000 raised, $697,380 was received upon
the Limited Partners' admission to the Partnership, and the balance was paid in
installments pursuant to the terms of promissory notes (the "Investor Notes")
delivered to the Partnership by the Limited Partners. The last installment was
due on January 15, 1990. As of March 1, 2000, $60,205 of this installment
remains uncollected.

      The General Partners and the general partners of the Operating Partnership
projected that reserves and deficit loans would be sufficient to fund operations
until the Project could achieve

                                       2

<PAGE>


break-even operations. However, due to lower than projected revenues and higher
than projected real estate taxes, the Project's cash flow deficit was
significantly higher than anticipated, and thus the reserves were depleted
sooner than anticipated.

Restructuring of Operating Partnership

      After failing to meet its mortgage obligations, the mortgage loan on the
Project was assigned by the lender to the Department of Housing and Urban
Development ("HUD") which had insured the mortgage. The Operating Partnership
and HUD entered into a written tentative Restructuring Agreement (the
"Restructuring Agreement") in December 1991. The Restructuring Agreement, which
was implemented on April 18, 1995 and was approved by a majority in interest of
the limited partners of the Partnership, provided for the split of the then
existing mortgage note into two new mortgage notes. This was designed to afford
the Project achievable debt service obligations under the Restructuring
Agreement. Both new mortgage notes mature on the same date as the original
mortgage loan, September 1, 2028. HUD will, however, have the right to
accelerate the obligations evidenced by the notes at any time after June 1,
2015.

      Each of the notes is prepayable in whole or in part at any time without
penalty. The first mortgage note, in the original principal amount of
$127,000,000, bears interest at an annual rate of 8.1%. All accrued and unpaid
interest will be compounded annually at the rate of 8.1%. The first mortgage
note consists of two tiers. The first tier, in the principal amount of
$71,000,000, is to be repaid through level monthly payments which amortizes the
debt over the remaining loan term. A service charge payable to HUD in the amount
of 0.5% per annum of the then outstanding principal mortgage balance will be
payable monthly. The secondary tier note is in the amount of $56,000,000. The
secondary tier requires semi-annual payments of principal and interest in an
amount equal to 80% of the Project's net cash flow; provided, however, that
commencing on the tenth anniversary of the closing (June 1, 2005), the
semi-annual payments will be in an amount equal to the greater of (i) 80% of the
Project's net cash flow or (ii) a fixed minimum payment of $164,025 that shall
increase each year between the eleventh year and twentieth year after closing.
The Operating Partnership made payments aggregating $1,300,000 on account of the
secondary tier during 1998. The annual HUD 0.5% service charge accrues on the
then outstanding principal amount of the second tier and will be due only upon
prepayment in full of the first mortgage note or maturity of the first mortgage
note. In addition, the Operating Partnership is obligated to reduce the
secondary tier's principal by a total of $10,000,000 over a six year period
expiring June 1, 2001. This $10,000,000 obligation has been funded as described
below.

      The original principal amount of the second mortgage note was $63,001,421.
The second mortgage note bears no interest and is payable from available
proceeds from a sale or refinancing of the Project. While the new second
mortgage note bears no interest, after payment in full of the principal amount
of the second mortgage note from the proceeds of a sale or refinancing of the
Project, 40% of all additional sale or refinancing proceeds shall be paid to HUD
until HUD shall have received $20,000,000 in excess of the principal amount of
the second mortgage note. HUD has the right to call this second note at any time
on or after June 1, 2015. The Restructuring Agreement also required the
Operating Partnership to establish a deficit escrow account of

                                       3

<PAGE>


$3,000,000 over a six year period from sources other than the operating revenues
of the Project to provide additional collateral security for the mortgages. The
two capital requirements described above (the $10,000,000 reduction to the first
mortgage note's second tier and the $3,000,000 deficit escrow account)
necessitated raising $13,000,000 of new equity (available over six years, as
required).

      In order to implement the Restructuring Agreement and raise the
$13,000,000 of new equity, a third party investor, TKI Presidential Partners
("TKI"), was admitted to the Operating Partnership as a general partner. TKI
agreed to contribute $14,000,000 over a six year period (as required by the
Restructuring Agreement with HUD) in exchange for a 79% general partnership
interest in the Operating Partnership, 79% of all future distributions by the
Operating Partnership of operating cash flow, a preferential return of its
capital contribution from the proceeds of a sale or refinancing, 79% of all
additional proceeds of a sale or refinancing, 100% of all future tax losses of
the Operating Partnership and effective control, through rights to approve or
initiate certain actions, over all major business decisions affecting the
Operating Partnership. As a result of TKI's investment, the Partnership's
interest in the Operating Partnership was reduced from a 94.99% limited
partnership interest to a 19.998% limited partnership interest and certain
control rights over major business decisions of the Operating Partnership were
transferred to TKI. As of December 31, 1999, TKI had funded $6,720,000 of its
$14,000,000 obligation. Pursuant to the terms of the Partnership Agreement of
the Operating Partnership, the Partnership is entitled to receive a distribution
from the Operating Partnership to reimburse it for its administrative expenses
and professional fees up to an annual maximum of $30,000. In addition, the
Operating Partnership made distributions to the Partnership during 1997, 1998
and 1999 of approximately, $255,839, $327,592, and $434,876 respectively.
However, due to TKI being entitled to a priority return, there can be no
assurance that the Operating Partnership will be able to make additional
distributions to the Partnership, if at all, until the property is sold.
However, due to the preferred return to TKI and HUD, it is possible that a sale
will not generate sufficient funds to permit a distribution to the Partnership.
Accordingly, it is anticipated that limited partners will not receive a return
of their original investment in the Partnership.

Employees

            The Partnership has no employees. On December 16, 1997, Winthrop
Financial and certain of its affiliates entered into a Services Agreement with
Coordinated Services of Valdosta, LLC ("Coordinated Services") pursuant to which
Coordinated Services was retained to provide asset management and investor
services to the Partnership and certain affiliated partnerships. As a result of
this agreement, Coordinated Services has the right to direct the day to day
affairs of the Partnership, including, without limitation, reviewing and
analyzing potential sale, refinancing or restructuring proposals by the
Operating Partnership, preparation of all Partnership reports, maintaining
Partnership records and maintaining bank accounts of the Partnership.
Coordinated Services is not permitted, however, without the consent of Winthrop
Financial, or as otherwise required under the terms of the Partnership's
Agreement of Limited Partnership (the "Partnership Agreement") to, among other
things, cause the Partnership to consent to a sale of an asset or cause the
Partnership to file for bankruptcy. As compensation for providing these
services, Winthrop Financial and its affiliates assigned to Coordinated Services


                                       4

<PAGE>


all of their right to receive fees from the Partnership as provided in the
Partnership Agreement. See "Item 12, Certain Relationships and Related
Transactions."

Item 2.           Description of Properties.

      The Partnership has no properties other than its interest in the Operating
Partnership. For a description of the properties of the Operating Partnership,
see Item 1, Description of Business.

Item 3.           Legal Proceedings.

      To the best of the Partnership's knowledge, there is no material pending
legal proceedings to which it is a party.

Item 4.           Submission of Matters to a Vote of Security Holders.

      No matter was submitted to a vote of security holders during the period
covered by this report.


                                       5

<PAGE>



                                     PART II

Item 5.           Market for the Partnership's Common Stock and Related Security
                  Holder Matters.

      The Partnership is a limited partnership and thus has no common stock.
There is no established public trading market for the Units of limited
partnership interest in the Partnership. Trading in Units is sporadic and occurs
solely through private transactions.

      As of March 1, 2000, there were approximately 580 holders of 590
outstanding Units.

      The Partnership Agreement requires that Cash Flow (as defined therein) be
distributed to the partners in specified proportions at reasonable intervals
during the fiscal year and in any event no later than 60 days after the close of
each fiscal year. There are no restrictions on the Partnership's present or
future ability to make distributions of cash flow. For the years ended December
31, 1998 and 1999, the Partnership made distributions to its limited partners of
$248,500 ($421.61 per Unit), and $323,378 ($548.09 per Unit) respectively, and
$1,250 and $1,625 to the General Partners. See Item 6 "Management's Discussion
and Analysis or Plan of Operation" for the Partnership's ability to make
distributions in the future.

      Over the past few years many companies have begun making "mini-tenders"
(offers to purchase an aggregate of less than 5% of the total outstanding units)
for limited partnership interests in the Partnership. Pursuant to the rules of
the Securities and Exchange Commission, when a tender offer is commenced for
Units the Partnership is required to provide limited partners with a statement
setting forth whether it believes limited partners should tender or whether it
is remaining neutral with respect to the offer. Unfortunately, the rules of the
Securities and Exchange Commission do not require that the bidders in certain
tender offers provide the Partnership with a copy of their offer. As a result,
the General Partners often do not become aware of such offers until shortly
before they are scheduled to expire or even after they have expired.
Accordingly, the General Partners do not have sufficient time to advise you of
its position on the tender. In this regard, please be advised that pursuant to
the discretionary right granted to the General Partners of your partnership in
the Partnership Agreement to reject any transfers of units, the General Partners
will not permit the transfer of any Unit in connection with a tender offer
unless: (i) the Partnership is provided with a copy of the bidder's offering
materials, including amendments thereto, simultaneously with their distribution
to the limited partners; (ii) the offer provides for withdrawal rights at any
time prior to the expiration date of the offer and, if payment is not made by
the bidder within 60 days of the date of the offer, after such 60 day period;
and (iii) the offer must be open for at least 20 business days and, if a
material change is made to the offer, for at least 10 business days following
such change.


                                       6

<PAGE>



Item 6.           Management's Discussion and Analysis or Plan of Operation.

      The matters discussed in this Form 10-KSB contain certain forward-looking
statements and involve risks and uncertainties (including changing market
conditions, competitive and regulatory matters, etc.) detailed in the disclosure
contained in this Form 10-KSB and the other filings with the Securities and
Exchange Commission made by the Partnership from time to time. The discussion of
the Partnership's business and results of operations, including forward-looking
statements pertaining to such matters, does not take into account the effects of
any changes to the Partnership's business and results of operation. Accordingly,
actual results could differ materially from those projected in the
forward-looking statements as a result of a number of factors, including those
identified herein.

Liquidity and Capital Resources

      The Partnership's primary source of liquidity is distributions from the
Operating Partnership. As a result of the restructuring, the Partnership is
entitled to receive a distribution from the Operating Partnership to reimburse
it for its administrative expenses and professional fees up to an annual maximum
of $30,000 to cover these costs. During 1999, the Partnership received
distributions totaling $434,876 from the Operating Partnership as compared to
$327,592 in 1998. Due to TKI being entitled to a priority return from the
Operating Partnership, there can be no assurance that the Operating Partnership
will be able to continue to make distributions to the Partnership until the
property is sold. Furthermore, due to the preferred return to TKI and HUD, it is
possible that a sale will not generate sufficient funds to permit a distribution
to the Partnership. Accordingly, it is anticipated that limited partners will
not receive a return of their original investment in the Partnership. See "Item
1, Business-Restructuring of Operating Partnership."

      The Partnership's liquidity, based on its cash and cash equivalents, was
$433,334 at December 31, 1999 as compared to $186,610 at December 31, 1998. This
increase was due to $567,907 of cash provided by operating activities which was
partially offset by $321,183 of cash used in financing activities. Cash used in
financing activities consisted primarily of distributions to partners.

Results of Operations

      The Partnership's net income for the year ended December 31, 1999 was
$394,503 as compared to $313,638 for the year ended December 31, 1998. The
increase in net income is a result of an increase in distributions from the
Operating Partnership which more than offset an increase in operating expenses.
Distributions from the Operating Partnership increased from $327,592 in 1998 to
$434,876 in 1999. Interest income increased slightly due to higher cash
balances. Operating expenses increased from $21,052 in 1998 to $49,503 in 1999.

      As discussed above, future operation of the Partnership are subject to the
Operating Partnership's ability to make distributions to the Partnership.
Expenses are expected to remain relatively constant for future periods.


                                       7

<PAGE>


      The General Partners believe that the inflation rate did not materially
affect the business or operating results of the Partnership during the last
three years; however, as discussed in Item 1 above, general economic conditions
have had a substantial effect on the operations of the Operating Partnership
since 1988. The residential market in Chicago is expected to continue to be
competitive for the foreseeable future.


                                       8

<PAGE>
                            FINANCIAL STATEMENTS AND
                          INDEPENDENT AUDITORS' REPORT

                            PRESIDENTIAL ASSOCIATES I
                               LIMITED PARTNERSHIP

                           DECEMBER 31, 1999 AND 1998


<PAGE>


                                TABLE OF CONTENTS
                  Presidential Associates I Limited Partnership


                                                                            PAGE

INDEPENDENT AUDITORS' REPORT                                      F-3


FINANCIAL STATEMENTS


  BALANCE SHEETS                                                  F-4


  STATEMENTS OF INCOME                                            F-5


  STATEMENTS OF PARTNERS' EQUITY (DEFICIT)                        F-6


  STATEMENTS OF CASH FLOWS                                        F-7


  NOTES TO FINANCIAL STATEMENTS                                   F-8


<PAGE>



                          INDEPENDENT AUDITORS' REPORT



To the Partners

Presidential Associates I Limited Partnership

         We have audited the accompanying balance sheets of Presidential
Associates I Limited Partnership as of December 31, 1999 and 1998, and the
related statements of income, partners' equity (deficit) and cash flows for the
years ended December 31, 1999 and 1998. These financial statements are the
responsibility of the partnership's management. Our responsibility is to express
an opinion on these financial statements based on our audits.

         We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audits to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

         In our opinion, the financial statements referred to above present
fairly, in all material respects, the financial position of Presidential
Associates I Limited Partnership as of December 31, 1999 and 1998, and the
results of its operations, changes in partners' equity (deficit) and its cash
flows for the years ended December 31, 1999 and 1998, in conformity with
generally accepted accounting principles.

/s/ Reznick Fedder & Silverman

Bethesda, Maryland
March 24, 2000


                                      F-3
<PAGE>

                  Presidential Associates I Limited Partnership

                                 BALANCE SHEETS

                               December 31, 1999


                                     ASSETS

                                                   1999                1998
                                                 --------            --------
Cash and cash equivalents                        $433,334            $186,610
Due from operating partnership                       --               173,404
                                                 --------            --------

                                                 $433,334            $360,014
                                                 ========            ========

                   LIABILITIES AND PARTNERS' EQUITY (DEFICIT)

PARTNERS' EQUITY (DEFICIT)                        433,334             360,014
                                                 --------            --------
                                                 $433,334            $360,014
                                                 ========            ========


                       See notes to financial statements

                                      F-4
<PAGE>

                  Presidential Associates I Limited Partnership

                              STATEMENTS OF INCOME

                            Years ended December 31,

<TABLE>
<CAPTION>
                                                                      1999            1998
                                                                    ---------       ---------
<S>                                                                <C>             <C>
Expenses
Other                                                               $  49,503       $  21,052
                                                                    ---------       ---------

                                                                      (49,503)        (21,052)

Other income

Distribution from operating partnership                               434,876         327,592
Interest income                                                         9,130           7,098
                                                                    ---------       ---------

NET INCOME                                                          $ 394,503       $ 313,638
                                                                    =========       =========

Units of investor limited partnership interest outstanding 590            590             590
                                                                    =========       =========

Net income allocated to general partner                             $   1,973       $   1,567
                                                                    =========       =========

Net income allocated to special limited partner                     $   1,973       $   1,567
                                                                    =========       =========

Net income allocated to investor limited partners                   $ 390,557       $ 310,504
                                                                    =========       =========

Net income per unit of investor limited partnership
interest outstanding                                                $     662       $     526
                                                                    =========       =========
</TABLE>

                       See notes to financial statements

                                      F-5
<PAGE>

                 Presidential Associates I Limited Partnership

                    STATEMENTS OF PARTNERS' EQUITY (DEFICIT)

                     Years ended December 31, 1999 and 1998

<TABLE>
<CAPTION>
                                                  Special limited
                                 General partner      partner
                                 --------------   ---------------
                                                      Phoenix
                                    Winthrop        Associates
                                   Financial          Limited       Investor limited
                                 Company, Inc.      Partnership         partners            Total
                                 --------------   ----------------  ----------------  -------------
<S>                             <C>               <C>               <C>              <C>
Partners' equity (deficit),
December 31, 1997                $  (270,579)      $  (572,488)      $ 1,136,507           293,440

Capital contributions                    100              --              66,959            67,059

Less capital contributions
 not yet received                       (100)             --             (64,023)          (64,123)

Distributions                         (1,250)           (1,250)         (247,500)         (250,000)

Net income                             1,567             1,567           310,504           313,638
                                 -----------       -----------       -----------       -----------

Partners' equity (deficit),
 December 31, 1998                  (270,262)         (572,171)        1,202,447           360,014

Capital contributions                    100              --              64,023            64,123

Less capital contributions
 not yet received                       (100)             --             (60,206)          (60,306)

Distributions                         (1,625)           (1,625)         (321,750)         (325,000)

Net income                             1,973             1,973           390,557           394,503
                                 -----------       -----------       -----------       -----------
Partners' equity (deficit),
 December 31, 1999               $  (269,914)      $  (571,823)      $ 1,275,071       $   433,334
                                 ===========       ===========       ===========       ===========
</TABLE>


                       See notes to financial statements

                                      F-6
<PAGE>


                  Presidential Associates I Limited Partnership

                             STATEMENT OF CASH FLOWS

                            Years ended December 31,

<TABLE>
<CAPTION>
                                                                   1999            1998
                                                                ---------       ---------
<S>                                                            <C>             <C>
Cash flows from operating activities
  Net income                                                    $ 394,503       $ 313,638
  Adjustments to reconcile net income to net cash
  provided by operating activities
     (Increase) decrease in due from operating partnership        173,404        (129,384)
                                                                ---------       ---------

          Net cash provided by operating activities               567,907         184,254
                                                                ---------       ---------

Cash flows from financing activities
  Distributions to partners                                      (325,000)       (250,000)
  Contributions from investor limited partners                      3,817           2,936
                                                                ---------       ---------

          Net cash used in financing activities                  (321,183)       (247,064)
                                                                ---------       ---------

          NET (DECREASE) INCREASE IN CASH
           AND CASH EQUIVALENTS                                   246,724         (62,810)

Cash and cash equivalents, beginning                              186,610         249,420
                                                                ---------       ---------

Cash and cash equivalents, end                                  $ 433,334       $ 186,610
                                                                =========       =========
</TABLE>

                       See notes to financial statements

                                      F-7
<PAGE>


                  Presidential Associates I Limited Partnership

                          NOTES TO FINANCIAL STATEMENTS

                           December 31, 1999 and 1998


NOTE A - ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

    The partnership was organized under laws of the State of Maryland on July 1,
    1983 to acquire a limited partnership interest in Presidential Towers, Ltd.
    (the "operating partnership").

    Use of Estimates

    The preparation of financial statements in conformity with generally
    accepted accounting principles requires management to make estimates and
    assumptions that affect the reported amounts of assets and liabilities and
    disclosure of contingent assets and liabilities at the date of the financial
    statements and the reported amounts of revenue and expenses during the
    reporting period. Actual results could differ from those estimates.

    Investment in the Operating Partnership

    The investment in the operating partnership is reported using the equity
    method of accounting, under which the initial investment is recorded at
    cost, increased or decreased by the partnership's share of income or losses,
    and decreased by distributions. The investment cannot be reduced below zero.

    Federal and State Income Taxes

    No provision or benefit for income taxes has been included in these
    financial statements since taxable income or loss passes through to, and is
    reportable by, the partners individually.

    Cash Equivalents

    For the purposes of the statement of cash flows, the partnership considers
    all highly liquid financial instruments, which consist of a money market
    account and amounts invested under a repurchase agreement, purchased with a
    maturity of three months or less, to be cash equivalents. The carrying
    amount approximates fair value because of the short maturity of this
    instrument.


                                      F-8
<PAGE>
                  Presidential Associates I Limited Partnership

                    NOTES TO FINANCIAL STATEMENTS - CONTINUED

                           December 31, 1999 and 1998



NOTE B - INVESTMENT IN OPERATING PARTNERSHIP

    The partnership held a 94.99% interest in the operating partnership which
    constructed, owns and operates four 49-story residential and commercial
    towers in Chicago, Illinois. During 1995, the partnership agreed to the
    restructuring of the operating partnership which included the admission of
    an additional general partner and an amendment to the operating
    partnership's partnership agreement. The amendment resulted in the
    partnership's interest in the operating partnership being reduced to
    19.998%. Further, all losses from the operating partnership are allocated to
    the new general partner.

    The following is a summary of the financial position of the operating
    partnership at December 31, 1999 and 1998, and a summary of its results of
    operations for each of the two years in the period ended December 31, 1999,
    prepared in conformity with generally accepted accounting principles.


                                 BALANCE SHEETS

<TABLE>
<CAPTION>
                                                                  1999               1998
                                                             -------------       -------------
<S>                                                          <C>                 <C>
ASSETS
   Buildings, improvements and personal
    property, net of accumulated depreciation                $  66,963,889       $  71,947,446
    of $85,651,713 and $79,721,797
   Land                                                          7,798,111           7,798,111
   Other assets                                                 10,850,808          10,224,575
                                                             -------------       -------------
Total assets                                                 $  85,612,808       $  89,970,132
                                                             =============       =============
LIABILITIES

   Mortgages payable, including deferred interest of
    $5,949,119 and $5,447,739, respectively                  $ 187,123,225       $ 190,047,617
   Other liabilities                                             9,565,343           9,299,506
                                                             -------------       -------------

                                                               196,688,568         199,347,123
 Partners' deficit                                            (111,075,760)       (109,376,991)
                                                             -------------       -------------
                                                             $  85,612,808       $  89,970,132
                                                             =============       =============
</TABLE>


                                       F-9
<PAGE>

                  Presidential Associates I Limited Partnership

                    NOTES TO FINANCIAL STATEMENTS - CONTINUED

                           December 31, 1999 and 1998


NOTE B - INVESTMENT IN OPERATING PARTNERSHIP (Continued)

                           STATEMENTS OF OPERATIONS

                                                1999                1998
                                            ------------        ------------
Revenue
   Rental                                   $ 30,574,198        $ 28,464,740
   Other                                       1,320,534           1,325,199
   Interest                                      240,602             247,677
                                            ------------        ------------
                                              32,135,334          30,037,616
                                            ------------        ------------
Expenses
   Operating expenses                         27,010,458          26,772,522
   Amortization                                   59,610              64,150
   Depreciation                                6,269,437           6,552,194
                                            ------------        ------------

                                              33,337,505          33,388,366
                                            ------------        ------------
       NET LOSS                             $ (1,204,170)       $ (3,351,250)
                                            ============        ============

   The unrecognized portion of cumulative losses will be offset against the
   partnership's share of future income from Presidential Towers, Ltd. The
   cumulative unrecognized loss at December 31, 1999 and 1998 is $87,430,407 and
   $87,039,850, respectively.

NOTE C - CAPITAL CONTRIBUTIONS

   Capital contributions receivable are recorded when received, and at December
   31, 1999 and 1998 are as follows:

                                                1999                1998
                                            ------------        ------------
   Investor limited partners                     $60,206             $64,023
   General partner                                   100                 100
                                            ------------        ------------

                                                 $60,306             $64,123
                                            ============        ============

                                      F-10
<PAGE>

                  Presidential Associates I Limited Partnership

                    NOTES TO FINANCIAL STATEMENTS - CONTINUED

                           December 31, 1999 and 1998


NOTE D - RELATED PARTY TRANSACTIONS

   During the year ended December 31, 1999, the operating partnership repaid
   advances and distributions totaling $7,518 and $165,886, respectively, to the
   partnership. No amounts remain payable to the partnership at December 31,
   1999.

NOTE E - RECONCILIATION OF NET INCOME

   The partnership's income for income tax purposes for 1999 and 1998 is the
   same as income for financial statement purposes.

   In addition, the net difference between buildings and improvements for tax
   purposes and financial statement purposes of the operating partnership for
   1999 and 1998 is as follows:

                                                1999                1998
                                            ------------        ------------

Buildings and improvements as reported      $66,963,889         $71,947,446
Buildings and improvements for tax purposes        --                  --
                                            ------------        ------------
                                            $66,963,889         $71,947,446
                                            ============        ============



                                      F-11
<PAGE>

Item 8.           Changes in and Disagreements with Accountants on Accounting
                  and Financial Disclosure.


      None.


                                       19

<PAGE>



                                    PART III

Item 9.           Directors, Executive Officers, Promoters and Control Persons;
                  Compliance with Section 16(a) of the Exchange Act.

      The Partnership has no officers or directors. Winthrop Financial manages
and controls substantially all of the Partnership affairs and has general
responsibility and ultimate authority in all matters affecting its business. As
of March 1, 2000, names of the directors and executive officers of Winthrop
Financial and the position held by each of them are as follows:

<TABLE>
<CAPTION>
                                                                                  Has Served as
                             Position Held with the                               a Director or
Name                         Managing General Partner                             Officer Since
----                         ------------------------                             -------------

<S>                          <C>                                                      <C>
Michael L. Ashner            Chief Executive Officer                                  1-96
                             and Director

Thomas C. Staples            Chief Financial Officer                                  1-99

Peter Braverman              Executive Vice President                                 1-96
                             and Director

Patrick J. Foye              Vice President - Residential                            10-98
                             and Director

Carolyn Tiffany              Chief Operating Officer                                 10-95
                             and Clerk
</TABLE>

      Michael L. Ashner, age 47, has been the Chief Executive Officer of
Winthrop Financial Associates, A Limited Partnership ("WFA") and the Managing
General Partner since January 15, 1996. From June 1994 until January 1996, Mr.
Ashner was a Director, President and Co-chairman of National Property Investors,
Inc., a real estate investment company ("NPI"). Mr. Ashner was also a Director
and executive officer of NPI Property Management Corporation ("NPI Management")
from April 1984 until January 1996. In addition, since 1981 Mr. Ashner has been
President of Exeter Capital Corporation, a firm which has organized and
administered real estate limited partnerships.

      Thomas C. Staples, age 44, has been the Chief Financial Officer of WFA
since January 1, 1999. From March 1996 through December 1998, Mr. Staples was
Vice President/Corporate Controller of WFA. From May 1994 through February 1996,
Mr. Staples was the Controller of the Residential Division of Winthrop
Management.

      Peter Braverman, age 48, has been a Vice President of WFA and the Managing
General Partner since January 1996. From June 1995 until January 1996, Mr.
Braverman was a Vice President of NPI and NPI Management. From June 1991 until
March 1994, Mr. Braverman was President of the Braverman Group, a firm
specializing in management consulting for the real estate and construction
industries. From 1988 to 1991, Mr. Braverman was a Vice President and


                                       20

<PAGE>


Assistant Secretary of Fischbach Corporation, a publicly traded, international
real estate and construction firm.

      Patrick J. Foye, age 42, has been Vice President-Residential and Director
of the Managing General Partner since October 1, 1998. Mr. Foye has served as
Executive Vice President of Apartment Investment and Management Company
("AIMCO") since May 1998. Prior to joining AIMCO, Mr. Foye was a partner in the
law firm of Skadden, Arps, Slate, Meagher & Flom LLP from 1989 to 1998 and was
Managing Partner of the firm's Brussels, Budapest and Moscow offices from 1992
through 1994. Mr. Foye is also Deputy Chairman of the Long Island Power
Authority and serves as a member of the New York State Privatization Council. He
received a B.A. from Fordham College and a J.D. from Fordham University Law
School.

       Carolyn Tiffany, age 33, has been employed with WFA since January 1993.
From 1993 to September 1995, Ms. Tiffany was a Senior Analyst and Associate in
WFA's accounting and asset management departments. Ms. Tiffany was a Vice
President in the asset management and investor relations departments of WFA from
October 1995 to December 1997, at which time she became the Chief Operating
Officer of WFA.

      One or more of the above persons are also directors or officers of a
general partner (or general partner of a general partner) of the following
limited partnerships which either have a class of securities registered pursuant
to Section 12(g) of the Securities and Exchange Act of 1934, or are subject to
the reporting requirements of Section 15(d) of such Act: Winthrop Partners 79
Limited Partnership; Winthrop Partners 80 Limited Partnership; Winthrop
Residential Associates I, A Limited Partnership; Winthrop Residential Associates
II, A Limited Partnership; Winthrop Residential Associates III, A Limited
Partnership; 1999 Broadway Associates Limited Partnership; Nantucket Island
Associates Limited Partnership; Riverside Park Associates Limited Partnership;
Springhill Lake Investors Limited Partnership; Twelve AMH Associates Limited
Partnership; Winthrop California Investors Limited Partnership; and Winthrop
Growth Investors I Limited Partnership.

      Except as indicated above, neither the Partnership nor Winthrop Financial
has any significant employees within the meaning of Item 401(b) of Regulation
S-B. There are no family relationships among the officers and directors of
Winthrop Financial.

      Based solely upon a review of Forms 3 and 4 and amendments thereto
furnished to the Partnership under Rule 16a-3(e) during the Partnership's most
recent fiscal year and Forms 5 and amendments thereto furnished to the
Partnership with respect to its most recent fiscal year, the Partnership is not
aware of any director, officer, beneficial owner of more than ten percent of the
units of limited partnership interest in the Partnership that failed to file on
a timely basis, as disclosed in the above Forms, reports required by section
16(a) of the Exchange Act during the most recent fiscal year or prior fiscal
years.

      Effective December 16, 1997, Winthrop Financial and certain of its
affiliates entered into an agreement with Coordinated Services of Valdosta, LLC
("Coordinated Services") to provide


                                       21

<PAGE>


for the daily asset and property management services and investor services for
the Partnership. See "Item 11, Security Ownership of Certain Beneficial Owners
and Management." Coordinated Services of Valdosta LLC is a Georgia limited
liability corporation with headquarters in Valdosta, Georgia. Founded in 1997,
its managing member is Investor Service Group, Inc., a Georgia Corporation. The
principals of Investor Service Group are Mary T. Johnson and James L. Dewar, Jr.

      Mary T. Johnson is the Manager of Coordinated Services. Ms. Johnson is
also Executive Vice President of Dewar Realty, Inc. and Dewar Properties, Inc.
Ms. Johnson is a graduate of Valdosta State University and is a licensed Georgia
Real Estate Broker. Ms. Johnson has 21 years of experience in property
management, asset management, investor services, and development of apartment
and assisted living properties. Ms. Johnson is currently responsible for the
asset management of over 150 investor partnerships and property management of
over 50 apartment communities.

      James L. Dewar, Jr. is the founder of Dewar Realty, Inc. and Dewar
Properties, Inc. Mr. Dewar is a graduate of the University of Georgia and is a
licensed Georgia Real Estate Broker. Mr. Dewar has 32 years experience in real
estate construction, property management and development of apartment and
assisted living properties. Mr. Dewar has produced over $100 million in
conventional and government funded family and elderly apartment communities.

Item 10.    Executive Compensation.

      The Partnership is not required to and did not pay any compensation to the
officers or directors of the General Partner. The General Partners do not
presently pay any compensation to any of its officers or directors. (See Item
12, "Certain Relationships and Related Transactions.")

Item 11.    Security Ownership of Certain Beneficial Owners and
            Management.

      (a)   Security ownership of certain beneficial owners.

      The Partnership is a limited partnership and has issued Units of limited
partnership interest. The Units are not voting securities, except that the
consent of the Limited Partners is required to approve or disapprove certain
transactions including the removal of a General Partner, certain amendments to
the Partnership Agreement, the dissolution of the Partnership or the sale of all
or substantially all of the assets of the Partnership. No Limited Partner owns
beneficially more than 5% of the Units in the Partnership.

      No other person or group is known by the Partnership to be the beneficial
owner of more than 5% of the outstanding partnership interest as of the date of
this Annual Report.

      (b)   Security Ownership of Management.


                                       22

<PAGE>


      One Unit of limited partnership interest is owned by a limited partner of
Linnaeus who is also a limited partner of the general partner of WFA and a
former employee and officer of WFA, Winthrop Financial and First Winthrop
Corporation. In addition, WFA owns two units of limited partnership interest. No
other officer, director or partner of Winthrop Financial or Linnaeus-Phoenix
owns any Units as of the date hereof in his individual capacity.

      (c)   Changes in Control.

      As a result of the implementation of the Restructuring Agreement in 1995,
TKI Presidential Partners, in exchange for a commitment to make a capital
contribution of $14,000,000 to the Operating Partnership over 6 years, acquired
certain control rights over major business decisions of the Operating
Partnership previously held by the Partnership, or WFC Realty Co., Inc. In
addition, as a result of the Restructuring Agreement the Partnership's interest
in the Operating Partnership was reduced from 94.99% to 19.998%.

      On December 16, 1997, the Managing General Partner and certain of its
affiliates entered into a Services Agreement with Coordinated Services pursuant
to which Coordinated Services was retained to provide asset management and
investor services to the Partnership and certain affiliated partnerships. As a
result of this agreement, Coordinated Services has the right to direct the day
to day affairs of the Partnership, including, without limitation, reviewing and
analyzing potential sale, refinancing or restructuring proposals by the
Operating Partnership, preparation of all Partnership reports, maintaining
Partnership records and maintaining bank accounts of the Partnership.
Coordinated Services is not permitted, however, without the consent of Winthrop
Financial, or as otherwise required under the terms of the Partnership Agreement
to, among other things cause the Partnership to consent to a sale of an asset or
cause the Partnership to file for bankruptcy. As compensation for providing
these services, Winthrop Financial and its affiliates assigned to Coordinated
Services all of their right to receive fees from the Partnership as provided in
the Partnership Agreement

Item 12.    Certain Relationships and Related Transactions.

      (a)   Transactions with Management and Others.

      None


                                       23

<PAGE>


Item 13.    Exhibits, Financial Statement Schedules, and Reports on Form 8-K.

(a)         Exhibits:

            The Exhibits listed on the accompanying Index to Exhibits are filed
            as part of this Annual Report and incorporated in this Annual Report
            as set forth in said Index.

(b)   Reports on Form 8-K - None


                                       24

<PAGE>


                                   SIGNATURES

      Pursuant to the requirements of Section 13 or 15(d) of the Securities
Exchange Act of 1934, the Partnership has duly caused this report to be signed
on its behalf by the undersigned, thereunto duly authorized.

                                PRESIDENTIAL ASSOCIATES I LIMITED
                                PARTNERSHIP

                                By: Winthrop Financial Co., Inc.,
                                    Managing General Partner

                                    By: /s/ Michael L. Ashner
                                       -------------------------------
                                         Michael L. Ashner
                                         Chief Executive Officer

                                    Date: May 17, 2000

      Pursuant to the requirements of the Securities Exchange Act of 1934, this
report has been signed below by the following persons on behalf of the
Partnership and in the capacities and on the dates indicated.

Signature/Name                Title                         Date
--------------                -----                         ----

/s/ Michael L. Ashner         Chief Executive Officer       May 17, 2000
---------------------         and Director
Michael L. Ashner


/s/ Thomas Staples            Chief Financial Officer       May 17, 2000
------------------
Thomas Staples


/s/ Peter Braverman           Executive Vice President      May 17, 2000
-------------------           and Director
Peter Braverman


                                       25

<PAGE>



                                 EXHIBIT INDEX

<TABLE>
<CAPTION>
Exhibit No.                                                                          Page

<S>         <C>                                                                       <C>
3,4         Amended and Restate Limited Partnership Agreement and Certificate of      (1)
            Amendment of Presidential Associates I Limited Partnership

  (b)       Amendment to Amended and Restated Limited Partnership Agreement           (3)
            and Certificate of Limited Partnership of Presidential Associates
            I Limited Partnership dated April 19, 1995

10(a)       Form of Investor Bond issued to the Partnership by Continental            (1)
            Casualty Company

  (b)       Trust Agreement dated as of September 15, 1980 between the Operating      (1)
            Partnership and LaSalle National Bank

  (c)       Letter of Credit and Reimbursement Agreement dated as of July 21, 1983    (1)
            between the Operating Partnership and Citibank, N.A.

  (d)       Revolving Credit and Term Loan Agreement dated as of September 30,        (1)
            1983 between the Partnership and Citibank, N.A.

  (e)       Regulatory Agreement for Multi-Family Housing project dated as of         (1)
            July 1, 1983 between LaSalle National Bank, as Trustee, the Operating
            Partnership, the General Partners and the Secretary of Housing and
            Urban Development

  (f)       Building Loan Agreement dated as of July 1, 1983 between LaSalle          (1)
            National Bank, as Trustee, and American National Bank & Trust
            Company of Chicago, as Trustee for the City of Chicago

  (g)       Mortgage Note dated as of July 1, 1983 in the amount of $158,900,000      (1)
            from LaSalle National Bank, as Trustee, to American National Bank &
            Trust Company of Chicago, as Trustee

  (h)       Mortgage dated as of July 1, 1983 between LaSalle National Bank and       (1)
            Trust Company of  Chicago, as Trustee

  (i)       Architectural Services Agreement dated as of July 1, 1983 between         (1)
            LaSalle National Bank, as Trustee, and Solomon Cordwell Buenz &
            Associates, Inc.
</TABLE>


                                       26

<PAGE>


<TABLE>
<CAPTION>
<S>         <C>                                                                       <C>
  (j)       Construction Contract dated as of July 21, 1983 between LaSalle           (1)
            National Bank, as Trustee, and James McHugh Development Co.

  (k)       Management Agreement dated as of July 14, 1983 between the                (1)
            Operating Partnership and The Habitat Company

  (l)       Financing Agreement dated as of July 1, 1983 among the City of            (1)
            Chicago, the Operating Partnership, LaSalle National Bank, as Trustee,
            Madison-Canal Company, McHugh Levin Associates
            Venture and American National Bank & Trust Company
            of Chicago, as Trustee

  (m)       Security Agreement - (Chattel Mortgage) dated July 1, 1983                (1)
            between LaSalle National Bank, as Trustee, and American
            National Bank & Trust Company of Chicago, as Trustee

  (n)       Commitment Letter dated March 22, 1983 of GNMA with                       (1)
            respect to the Project

  (o)       Loan Agreement dated September 20, 1988 between Presidential              (2)
            Towers, Ltd. and American National  Bank and Trust Company
            of Chicago

  (p)       Third Amended and Restated Limited Partnership Agreement of               (3)
            Presidential Towers, Ltd., dated April 19, 1995

  (q)       Amended and Restated Substitute Mortgage Note, dated April 18, 1995       (3)
            made by LaSalle National  Trust, N.A., as trustee, in favor of the
            Secretary of Housing and Urban Development

  (r)       Third Modification to Mortgage, dated April 18, 1995, between             (3)
            LaSalle National Trust, N.A., as Trustee the Secretary of Housing
            and Urban Development

  (s)       Amendment to Regulatory Agreement for Multifamily Housing                 (3)
            Projects, dated as of April 18, 1995, between LaSalle National Bank,
            as Trustee, and Presidential Towers, Ltd. and the Secretary of
            Housing and Urban Development

  (t)       Restructuring Agreement, dated April 18, 1995, among LaSalle              (3)
            National Trust, as Trustee, Presidential Towers, Ltd. and the
            Secretary of Housing and Urban Development.
</TABLE>


                                       27

<PAGE>

<TABLE>
<CAPTION>
<S>         <C>                                                                       <C>
(u)         Services Agreement, dated December 16, 1997,                              (4)
            by and between First Winthrop Corporation, Winthrop Financial Co.,
            Inc., WFC Realty Co., Inc., WFC Realty Saugus, Inc., Winthrop
            Properties, Inc., Winthrop Metro Equities Corporation, Winthrop Libson
            Realty, Inc. and Northwood Realty Co., Inc. and Coordinated Services of
            Valdosta, LLC.

  27.       Financial Data Schedule
</TABLE>

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

(1)   Incorporated herein by reference to the Partnership's Registration
      Statement on Form 10 (Commission Partnership file number 0-12210).
(2)   Incorporated herein by reference to Exhibit 10(p) to the Partnership's
      Annual Report on Form 10-K for the year ended December 31, 1985.
(3)   Incorporated herein by reference to Partnership's Annual Report on Form
      10-K for the year ended December 31, 1995.
(4)   Incorporated by reference to the Partnership's Quarterly Report on Form
      10-QSB for the quarter ended March 31, 1998.


                                       28