<PAGE>   1
                                                                EXHIBIT 10.106

                       SUBDIVISION IMPROVEMENT AGREEMENT

        THIS AGREEMENT, made and entered into this 17th day of December, 1996 by
and between Preferred Equities Corporation (hereinafter referred to as
"DEVELOPER"), party of the first part, and the BOARD OF COUNTY COMMISSIONERS OF
THE COUNTY OF NYE, STATE OF NEVADA (hereinafter referred to as "BOARD"), party
of the second part,

                             W I T N E S S E T H :

        WHEREAS, at a regular meeting of the BOARD, held on the 17th day of
December, 1996, the DEVELOPER submitted a final Subdivision Map entitled
"Calvada Meadows Unit 4," Assessor's parcel numbers 27-301-12 and 27-301-13,
consisting of 443 lots, located within the Town of Pahrump, Nye County, Nevada;
and

        WHEREAS, approval of said final Subdivision Map was conditioned upon,
and subject to, certain improvements required by the laws of the State of
Nevada, the ordinances of the County of Nye, or in order to provide for the
health, safety, welfare and morals of the citizens of Nye County; and

        WHEREAS, said final Subdivision Map has been examined by Nye County and
found to be in compliance with current laws and ordinances in effect as of the
date of this Agreement, excepting that certain required improvements have not
been completed.

        NOW, THEREFORE, in consideration of the approval of said final
Subdivision Map by the BOARD, DEVELOPER promises and agrees, at no expense to
Nye County nor its citizens, to complete the following improvements:

1.      IMPROVEMENTS

        The estimated cost of roads, water system, on- and off-site sewer 
system and surveying is provided by Crosby, Mead, Benton and Associates (see 
Exhibit A).

1.1     ROADS

Developer shall improve all portions of streets and roads which appear on said
map in conformance with plans submitted to, and approved by, the


                                      -1-                      2 of 2 Originals
<PAGE>   2
Public Works Department.

                                        Cost: $240,190.00

1.2     ON- AND OFF-SITE SEWER SYSTEM LINES

Developer shall construct all on- and off-site sewer lines in conformance with
plans and specifications approved by the Nevada Division of Health.

                                        Cost: $1,065,323.00

1.3     ON-SITE WATER SYSTEM LINES

Developer shall construct water system lines in conformance with plans and
specifications approved by the Nevada Division of Health.

                                        Cost: $850,635.25

1.4     SURVEYING

Developer shall cause each lot to be properly surveyed and monumented in
accordance with Nevada Revised Statutes.

                                        Cost: $17,720.00

               Total Cost of Improvements: $2,173,868.25

2.      SECURITY

        The complete performance of construction of the roads, water system,
sewer system and surveying is secured by: A Performance Bond numbered 149-37-90
and dated Dec 19, 1996 (see Exhibit B) in the amount of $2,499,948.49,
representing 115% of the estimated cost of said improvements.

3.      APPROVAL OF WORK AFTER INSPECTION

        Whenever an authorized representative of the BOARD inspects portions of
work as mentioned above, and finds the work performed to be in a satisfactory
condition for inclusion in the completed project, the BOARD's representative
shall issue a statement of inspection that shall approve the work.


                                      -2-                     2 of 2 Originals
<PAGE>   3
        Inspection and approval of any item of work shall not forfeit the right
of the BOARD to require the corrections of workmanship quality or materials at
any time during the course of work, although previously approved by oversight.

        The BOARD shall have the right to require reasonable corrections by the
Developer of any improvements contained in this Agreement that does not conform
to present State and County standards, specifications, or ordinances even though
the plans for the improvement in question may have been approved by the BOARD's
representative. DEVELOPER must provide the BOARD copies of all reports, tests,
inspections, etc. that are required to be provided to state agencies. Also,
DEVELOPER must provide written certification that the construction was completed
in accordance with plans and specifications.

4.      MAP REQUIREMENTS ON COMPLETION OF IMPROVEMENTS

        Upon completion of all of the improvements required within this
Agreement, the DEVELOPER shall furnish the BOARD with a map that shall
accurately indicate the location of manholes; the location, size, and depth of
sewer mains, underground water, power, and other lines if any with street plans
and profiles for same.

5.      TIME LIMIT FOR COMPLETION OF IMPROVEMENTS

        All of the improvements as set forth in the above paragraphs shall be
completed no later than three (3) years from the date of this Agreement, failing
which the BOARD may, at its option, avail itself of the security provided for
the enforcement hereof to cause such improvements to be made by an independent
contractor at the expense of the DEVELOPER or the security.

6.      LIABILITY OF DEVELOPER

        DEVELOPER shall save and hold the BOARD harmless and free from any suit
or cause of action, claim or demand, which may be brought or made against the
DEVELOPER or its successor in interest or its purchaser by any third party
arising from the performance or


                                      -3-                      2 of 2 Originals
<PAGE>   4
nonperformance of the construction of the subdivision improvements as provided
herein or any and all other conditions of this Agreement.

        DEVELOPER shall furthermore continue to be liable to the BOARD for the
performance of all terms and conditions of this Agreement regardless of the
DEVELOPER's failure to continue work under this Agreement or assignment of its
rights to do such work and regardless of the status of ownership of the real
property or any portion thereof made the subject of the final Subdivision Map of
the Subdivision referred to in this Agreement.

        In the event the BOARD is required to institute legal action to compel
performance of this Agreement, or to defend any suit or claim, or liability
resulting from or arising out of this Agreement, DEVELOPER shall pay to the
BOARD all reasonable attorney's fees, costs of suit, and all other expenses of
litigation incurred by the BOARD in connection therewith.

7.      SUCCESSORS OF DEVELOPER

        This Agreement shall be binding upon, and inure to the benefit of all
heirs, executors, administrators, successors, assigns, or purchasers of the
respective parties to this Agreement, and all terms and conditions contained
herein shall be equally binding on said heirs, executors, administrators,
successors, assigns, or purchasers.

        IN WITNESS WHEREOF, the parties hereto have executed this Agreement the
day and year first above written.


COUNTY OF NYE                                   DEVELOPER

/s/ CAMERON MCRAE                               /s/ FREDERICK H. CONTE
-----------------------------                   ------------------------------
Cameron McRae, Chairman                         Frederick H. Conte
Board of County Commissioners                   Executive Vice President &
                                                Chief Operating Officer,
                                                Preferred Equities Corporation
ATTEST:

/s/ SANDRA L. MERLINO, DEPUTY
-----------------------------
Arte Robb, County Clerk and
Ex-Officio Clerk of the Board


                                      -4-                      2 of 2 Originals
<PAGE>   5
                                                                EXHIBIT A
                                                                1 OF 3



                           Improvement Bond Estimates
                        for the following subdivisions:



                         Calvada North Unit 1, Block 37
                         Calvada North Unit 1, Block 57
                         Calvada North Unit 3, Block 24
                        Calvada Valley Unit 4a, Block 5
                       Country Place II, Unit 4, Block 17
                             Calvada Meadows Unit 4





                  Prepared by: Crosby Mead Benton & Associates
                               6345 Balboa Blvd., Suite 140
                               Encino, CA 91315
                               (818) 343-5384



                      [             SEAL OF              ] 
                      [ REGISTERED PROFESSIONAL ENGINEER ]
                      [         STATE OF NEVADA          ]
                      [            No. 05299             ]
<PAGE>   6
12/16/96                                                               EXHIBIT B
                                                                          PAGE 1
                             CALVADA MEADOWS UNIT 4
                               443-1/4 ACRE LOTS

<TABLE>
<CAPTION>
STREET IMPROVEMENTS
-------------------
<S>                                      <C>
DESCRIPTION                              QTY UNIT      UNIT PRICE      TOTAL
6" Gravel incl/Grading                   22,585 LF          9.00     203,265.00
6" Gravel incl/Grading 1/2 Rd             5,275 LF          7.00      36,925.00
                                                                   ------------
                TOTAL STREET IMPROVEMENTS                            240,190.00


SEWER SYSTEM ONSITE
-------------------
DESCRIPTION                              QTY UNIT      UNIT PRICE      TOTAL
 8" PVC                                  24,391 LF         15.00     365,865.00
10" PVC                                     270 LF         16.75       4,522.50
Manholes                                     74 EA      1,650.00     122,100.00
Pipe bedding                             24,661 LF          2.50      61,652.50
                                                                   ------------
                SUBTOTAL SEWER SYSTEM ONSITE                         554,140.00

SEWER SYSTEM OFFSITE
--------------------
DESCRIPTION                              QTY UNIT      UNIT PRICE      TOTAL
10" PVC                                     300 LF         16.75       5,025.00
12" PVC                                  16,072 LF         19.00     305,368.00
 8" PVC Sewer Force Main                  6,280 LF         13.00      81,640.00
Manholes                                     51 EA      1,650.00      84,150.00
Sewer Lift Station                            1 LS     35,000.00      35,000.00
                                                                   ------------
                SUBTOTAL SEWER SYSTEM OFFSITE                        511,183.00

                TOTAL SEWER SYSTEM                                 1,065,323.00

</TABLE>
<PAGE>   7
12/16/96                                                               EXHIBIT B
                                                                          PAGE 2
                             CALVADA MEADOWS UNIT 4
                               443-1/4 ACRE LOTS

<TABLE>
<CAPTION>
WATER SYSTEM ONSITE
-------------------
DESCRIPTION                             QTY UNIT      UNIT PRICE      TOTAL
<S>                                     <C>            <C>           <C>
 8" PVC                                 18,207 LF         15.00      273,105.00
12" PVC                                  5,136 LF         18.75       96,300.00
16" PVC                                  5,127 LF         25.75      132,020.25
 8" Water Valve                             47 EA        550.00       25,850.00
12" Water Valve                             12 EA        950.00       11,400.00
16" Water Valve                             11 EA      1,350.00       14,850.00
 8" Cross                                   10 EA        400.00        4,000.00
 8" Tee                                      5 EA        305.00        1,525.00
12" Cross                                    2 EA        700.00        1,400.00 
12" Tee                                      8 EA        575.00        4,600.00
16" Cross                                    3 EA      1,225.00        3,675.00
16" Tee                                      6 EA        985.00        5,910.00
Fire Hydrants                               58 EA      2,000.00      116,000.00
Water wells, Pumps & Hydro tank              2 EA     80,000.00      160,000.00
                                                                   ------------
                SUBTOTAL WATER SYSTEM ONSITE                         850,635.25

                TOTAL WATER SYSTEM                                   850,635.25


FIELD SURVEY
------------
DESCRIPTION                              QTY UNIT      UNIT PRICE      TOTAL
Set Monumentation                         443 LOT         40.00       17,720.00
                                                                   ------------
                TOTAL FIELD SURVEY                                    17,720.00

                SUBTOTAL CONSTRUCTION COSTS                        2,173,868.25

                15% CONTINGENCY                                      326,080.24
                                                                   ------------
                TOTAL CONSTRUCTION COSTS                           2,499,948.49

</TABLE>

<PAGE>   8
                                                                EXHIBIT B
                                                                1 OF 2


                                     [LOGO]

                         INSURANCE COMPANY OF THE WEST
                                 P.O. Box 85563
                            San Diego, CA 92186-5563

                                                             Bond No. 149-37-90

Subdivision Bond

Faithful Performance--Public Works


                                SUBDIVISION BOND

KNOW ALL MEN BY THESE PRESENTS: That PREFERRED EQUITIES CORPORATION, as
Principal, and the INSURANCE COMPANY OF THE WEST, a corporation organized and
existing under the laws of the State of California and authorized to transact
surety business in the State of NEVADA as Surety, are held and firmly bound unto
COUNTY OF NYE, NEVADA in the sum of TWO MILLION FOUR HUNDRED NINETY-NINE
THOUSAND NINE HUNDRED FORTY-EIGHT AND 49/100 Dollars ($2,499,948.49), for the
payment whereof, well and truly to be made, said Principal and Surety bind
themselves, their heirs, administrators, successors and assigns, jointly and
severally, firmly by these presents.

        The condition of the foregoing obligation is such that, whereas the
above bounden Principal has entered into a contract dated DECEMBER 17, 1996,
with the COUNTY OF NYE, NEVADA to do and perform the following work, to wit:

                OFFSITE IMPROVEMENTS AT CALVADA MEADOWS UNIT 4
                443-1/4 ACRE LOTS LOCATED WITHIN NYE COUNTY, NEVADA

        NOW, THEREFORE, if the above bounden Principal shall well and truly
perform the work contracted to be performed under said contract, then this
obligation shall be void; otherwise to remain in full force and effect.

        SIGNED and SEALED this 19TH day of DECEMBER, 1996.

Witness:


BY:                                     PREFERRED EQUITIES CORPORATION
   ------------------------------       
                                        BY: /s/ [ILLEGIBLE]
COUNTERSIGNED THIS 19TH DAY OF              -------------------
DECEMBER, 1996                                   Principal

BY: /s/ [ILLEGIBLE]                     INSURANCE COMPANY OF THE WEST
    ---------------------
        (NEVADA AGENT)                  /s/ DEBBIE K. BAILEY
                                            ----------------------------------
Sedgwick James of Nevada                    DEBBIE K. BAILEY  ATTORNEY-IN-FACT
------------------------
<PAGE>   9
                                                                      EXHIBIT B
                                                                         2 OF 2

                         INSURANCE COMPANY OF THE WEST
                       HOME OFFICE: SAN DIEGO, CALIFORNIA

                               POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS: That INSURANCE COMPANY OF THE WEST, a California
Corporation, does hereby appoint:

                                DEBBIE K. BAILEY

its true and lawful Attorney(s)-in-Fact, with full power and authority, to
execute, on behalf of the Company, fidelity and surety bonds, undertakings, and
other contracts of suretyship of a similar nature.

This Power of Attorney is granted and is signed and sealed by facsimile under
the authority of the following Resolution adopted by the Board of Directors on
the 22nd day of November, 1994, which said Resolution has not been amended or
rescinded and of which the following is a true copy:

        "RESOLVED, that the Chairman of the Board, the President, an Executive
Vice President or a Senior Vice President of the Company, and each of them, is
hereby authorized to execute Powers of Attorney qualifying the attorney named in
the given Power of Attorney to execute on behalf of the Company, fidelity and
surety bonds, undertakings, or other contracts of suretyship of a similar
nature; and to attach thereto the seal of the Company; provided however, that
the absence of the seal shall not affect the validity of the instrument.

        FURTHER RESOLVED, that the signatures of such officers and the seal of
the Company, and the signatures of any witnesses, the signatures and seal of any
notary, and the signatures of any officers certifying the validity of the Power
of Attorney, may be affixed by facsimile."

IN WITNESS WHEREOF, INSURANCE COMPANY OF THE WEST has caused these presents to
be signed by its duly authorized officers this 7th day of September 1995.

                                        INSURANCE COMPANY OF THE WEST
[INSURANCE COMPANY OF THE WEST
       CORPORATE SEAL]
                                        /s/ JOHN L. HANNUM
                                        -------------------------------------
                                        John L. Hannum, Senior Vice President

STATE OF CALIFORNIA
                        SS.
COUNTY OF SAN DIEGO


        On September 7th, 1995 before me, personally appeared John L. Hannum,
Senior Vice President of INSURANCE COMPANY OF THE WEST, personally known to me
to be the individual and officer who executed the within instrument, and
acknowledged to me that he executed the same in his official capacity and that
by his signature on the instrument, the corporation, on behalf of which he
acted, executed the instrument.

WITNESS my hand and official seal.

[NOTARY PUBLIC-CALIFORNIA               /s/ NORMA PORTER
 SAN DIEGO COUNTY SEAL]                 ----------------
                                          Notary Public

CERTIFICATE

        I, E. Harned Davis, Vice President of INSURANCE COMPANY OF THE WEST, do
hereby certify that the original POWER OF ATTORNEY, of which the foregoing is a
true copy, is still in force and effect, and that this certificate may be signed
by facsimile under the authority of the above quoted resolution. 

        IN WITNESS WHEREOF, I have subscribed my name as Vice President, on
this 19TH day of DECEMBER 1996.  

                                        INSURANCE COMPANY OF THE WEST
[INSURANCE COMPANY OF THE WEST
       CORPORATE SEAL]                  /s/ E. HARNED DAVIS
                                        ------------------------------
                                        E. Harned Davis, Vice President

                            [OFFICIAL REQUEST STAMP
                             NYE CO. NEV. RECORDER]