Document:

<PAGE>   1
                                                                    EXHIBIT 10.2

--------------------------------------------------------------------------------
                               FIRST AMENDMENT TO
                   WAREHOUSING CREDIT AND SECURITY AGREEMENT
--------------------------------------------------------------------------------

THIS FIRST AMENDMENT TO WAREHOUSING CREDIT AND SECURITY AGREEMENT (this
"Amendment") is entered into as of this 17th day of July, 2000, by and between
BLOOMFIELD SERVICING COMPANY, L.L.C., a Michigan Corporation ("Bloomfield
Servicing") and BLOOMFIELD ACCEPTANCE COMPANY, L.L.C., a Michigan limited
liability company ("Bloomfield Acceptance"), Bloomfield Servicing and Bloomfield
Acceptance are referred to herein, collectively or individually, as the context
may require, as the "Borrowers") and RESIDENTIAL FUNDING CORPORATION, a Delaware
corporation (the "Lender").

WHEREAS, the Company and the Lender have entered into a multifamily revolving
warehouse facility with a present Commitment Amount of $50,000,000, to finance
the origination and acquisition of Mortgage Loans as evidenced by a Warehousing
Promissory Note in the principal sum of $25,000,000 dated as of March 15, 2000
and a Bridge Loan Promissory Note in the principal sum of $25,000,000 dated as
of March 15, 2000 (the "Notes"), and by a Warehousing Credit and Security
Agreement dated as of March 15, 2000, as the same may have been amended or
supplemented (the "Agreement");

WHEREAS, the Company has requested that the Lender extend the period for which
the Commitment under the Agreement has been made, and amend certain other terms
of the Agreement, and the Lender has agreed to such amendment of the Agreement
subject to the terms and conditions of this Amendment; and

NOW, THEREFORE, for and in consideration of the foregoing and of the mutual
covenants, agreements and conditions hereinafter set forth and for other good
and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto hereby agree as follows:

1.   The effective date ("Effective Date") of this Amendment shall be July 17,
2000.

2.   All capitalized terms used herein and not otherwise defined shall have
their respective meanings set forth in the Agreement.

3.   Section 1.1 of the Agreement is amended to delete the following
definitions in their entirety, replacing them with the following definitions:

     "Maturity Date" shall mean the earlier of: (a) the close of business on
August 31, 2000, as such date may be extended from time to time in writing by
the Lender, in its sole discretion, on which date the Commitment shall expire
of its own term, and without the necessity of action by the Lender, and (b) the
date the Advances become due and payable pursuant to Section 8.1 below.

4.   Section 7.7 of the Agreement is deleted in its entirety and the following
is substituted in lieu thereof:

          7.7 Minimum Net Worth. Permit (a) Tangible Net Worth of Bingham (and
its Subsidiaries, on a consolidated basis) at any time to be less than
$15,000,000, (b) Tangible Net Worth of Bloomfield Servicing (and its
Subsidiaries, on a consolidated basis) at any time to be less than $2,000,000,
or (c) Book Net Worth of Bloomfield Acceptance (and its Subsidiaries, on a
consolidated basis) at any time from the Effective Date of this Amendment to and
including December 30, 2000, to be less than $750,000, and on December 31, 2000,
and thereafter, to be less than $1,000,000.

                                      -1-
<PAGE>   2
5.    Section 7.7(c) of the Agreement requires the Company to maintain a minimum
Book Net Worth of Bloomfield Acceptance of $1,000,000. The Company's financial
statements dated March 31, 2000, show an actual minimum Book Net Worth of
$825,000, resulting in the existence of an Event of Default under the Agreement.
The Company has requested that the Lender waive its rights and remedies with
respect to Defaults and Events of Default under Section 7.7(c) from the Closing
Date to the Effective Date. The Lender agrees to waive its rights and remedies
with respect to Defaults and Events of Default under Section 7.7(c) from the
Closing Date to the Effective Date; provided, however, that this waiver is
limited to the specific Event of Default described above and is not intended and
will not be construed to be a wavier of any future Default or Event of Default
of Section 7.7(c) or any existing or future Default or Event of Default under
any other provision of the Agreement.

6.    Upon execution of this Amendment, the Company agrees to pay to the Lender
the pro rata Commitment Fee on the Commitment Amount for the time period from
August 1, 2000, to and including August 31, 2000.

7.    The Warehousing Promissory Note is amended and restated in its entirety as
set forth in the First Amended and Restated Warehousing Promissory Note, in the
form of Exhibit A-1 attached to this Amendment. All references in this Amendment
and in the Agreement to the Warehousing Promissory Note shall be deemed to refer
to the First Amended and Restated Warehousing Promissory Note delivered in
connection with this Amendment.

8.    Exhibit M to the Agreement is hereby deleted in its entirety and replaced
with the new Exhibit M attached to this Amendment. All references in the
Agreement to Exhibit M shall be deemed to refer to the new Exhibit M.

9.    The Company must deliver to the Lender (a) an executed original of this
Amendment; (b) a First Amended and Restated Warehousing Promissory Note; (c) the
Commitment Fee for the month of August 2000; and (d) a $350 document production
fee.

10.   The Company represents, warrants and agrees that (a) except as stated in
Section 5 above, there exists no Default or Event of Default under the Loan
Documents, (b) the Loan Documents continue to be the legal, valid and binding
agreements and obligations of the Company enforceable in accordance with their
terms, as modified herein, (c) the Lender is not in default under any of the
Loan Documents and the Company has no offset or defense to is performance or
obligations under any of the Loan Documents, (d) the representations contained
in the Loan Documents remain true and accurate in all material respects, and (e)
there has been no material adverse change in the financial condition of the
Company from the date of the Agreement to the date of this Amendment.

11.   Except as hereby expressly modified, the Agreement is otherwise unchanged
and remains in full force and effect, and the Company ratifies and reaffirms all
of its obligations thereunder.

12.   This Amendment may be executed in any number of counterparts and by the
different parties hereto on separate counterparts, each of which when so
executed and delivered shall be an original, but all of which shall together
constitute one and the same instrument.

                                      -2-
<PAGE>   3
IN WITNESS HEREOF, the Company and the Lender have caused this Amendment to be
duly executed on their behalf by their duly authorized officers as of the day
and year above written.

                                      BLOOMFIELD SERVICING COMPANY, L.L.C.,
                                      a Michigan corporation

                                      By:  /s/ John Spalding
                                         --------------------------------------

                                      Its: President
                                          -------------------------------------

                                      BLOOMFIELD ACCEPTANCE COMPANY, L.L.C.,
                                      a Michigan limited liability company

                                      By:  /s/ Daniel E. Bober
                                         --------------------------------------

                                      Its: President
                                          -------------------------------------

                                      RESIDENTIAL FINDING CORPORATION,
                                      a Delaware corporation

                                      By:  /s/ Lisa F. Carlson
                                         --------------------------------------

                                      Its: Managing Director
                                          -------------------------------------

STATE OF MICHIGAN       )
                        )
COUNTY OF MACOMB        )

On, July 14th, 2000 before me, a Notary Public, personally appeared John L.
Spalding the President of BLOOMFIELD SERVICING COMPANY, L.L.C., a Michigan
corporation personally known to me (or proved to me on the basis of
satisfactory evidence) to be the person whose name is subscribed to the within
instrument and acknowledged to me that he/she executed the same in his/her
authorized capacity, and that by his/her signature on the instrument the
person, or the entity upon behalf of which the person acted, executed the
instrument.

WITNESS my hand and official seal.
                                           /s/ Melissa Haskins
                                           ------------------------------------
                                           Notary Public
               (seal)
                                           (SEAL) My Commission Expires: 9-4-01
                                                                         ------

                                      -3-

<PAGE>   4

STATE OF MICHIGAN       )
                        )
COUNTY OF MACOMB        )

On, July 14th, 2000 before me, a Notary Public, personally appeared Daniel E.
Bober the President of BLOOMFIELD ACCEPTANCE COMPANY, L.L.C., a Michigan
corporation personally known to me (or proved to me on the basis of
satisfactory evidence) to be the person whose name is subscribed to the within
instrument and acknowledged to me that he/she executed the same in his/her
authorized capacity, and that by his/her signature on the instrument the
person, or the entity upon behalf of which the person acted, executed the
instrument.

WITNESS my hand and official seal.

                                        /s/ Melissa Haskins
                                        --------------------------------------
                                        Notary Public

     (SEAL)                             (SEAL) My Commission Expires: 9-4-01
                                                                      ------

STATE OF MARYLAND       )
                        )
COUNTY OF MONTGOMERY    )

On, July 17th, 2000 before me a Notary Public, personally appeared Lisa F.
Carlson the Managing Director of RESIDENTIAL FUNDING CORPORATION, a Delaware
corporation, personally known to me (or proved to me on the basis of
satisfactory evidence) to be the person whose name is subscribed to the within
instrument and acknowledged to me that she executed the same in her authorized
capacity, and that by her signature on the instrument the person, or the entity
upon behalf of which the person acted, executed the instrument.

WITNESS my hand and official seal.

                                        /s/ Alaeta S. Myers
                                        -------------------------------------
                                        Notary Public

     (SEAL)                             (SEAL) My Commission Expires: 11-01-00
                                                                      --------

                                      -4-
<PAGE>   5
                              CONSENT OF GUARANTOR
--------------------------------------------------------------------------------

The undersigned, being the Guarantor under the Guaranty dated as of March 15,
2000, hereby consents to the foregoing Amendment and the transactions
contemplated thereby and hereby modifies and reaffirms its obligations under
its Guaranty so as to include within the term "Guaranteed Debt" the
indebtedness, obligations and liabilities of the Company under this Amendment
and the Warehousing Promissory Note.  The Guarantor hereby reaffirms that its
obligations under its Guaranty are separate and distinct from the Company's
obligations to Lender, and that its obligations under the Guaranty are in full
force and effect, and hereby waives and agrees not to assert any
anti-deficiency protections or other rights as a defense to its obligations
under the Guaranty, all as more fully set forth in the Guaranty, the terms of
which are incorporated herein as if fully set forth herein.

The Guarantor hereby irrevocably waives any claim or other rights that the
Guarantor may now have or hereafter acquire against the Company that arises
from the existence, payment, performance or enforcement of the Guarantor's
obligations hereunder, including any right of subrogation, reimbursement,
exoneration, contribution or indemnification and any right to participate in any
claim or remedy of the Lender against the Company or any collateral that the
Lender now has or hereafter acquires, whether or not such claim, remedy or
right arises in equity or under contract, statute or common law, including the
right to take or receive from the Company directly or indirectly, in cash or
other property or by set-off or in any manner, payment or security on account
of such claim or other right, until the Guaranteed Debt has been paid and
performed in full.  If any amount shall be paid to the Guarantor in violation of
the preceding sentence, such amount shall be deemed to have been paid to the
Guarantor for the benefit of, and held in trust for, the Lender and shall
forthwith be paid to the Lender to be credited and applied to the Guaranteed
Debt, whether matured or unmatured.  In addition, to the extent permitted by
law, the Guarantor irrevocably releases and waives any such subrogation rights
or rights of reimbursement, exoneration, contribution or indemnity if and to
the extent any such right or rights would give rise to a claim under the U.S.
Bankruptcy Code that payments or transfers to the Lender with respect to the
Guaranteed Debt constitute a preference in favor of the Guarantor or a claim
under the U.S. Bankruptcy Code that the preference is recoverable from the
Lender.

The Guarantor further agrees, upon Lender's request, to execute for the benefit
of Lender an additional guaranty in form and content acceptable to Lender and
conforming to the Guaranty in connection with the foregoing Amendment.

                                      BINGHAM FINANCIAL SERVICES
                                      CORPORATION,
                                      a Michigan corporation

                                      By: /s/ Ronald A. Klein
                                          -------------------------------

                                      Its: CEO
                                          -------------------------------

                                      -5-
<PAGE>   6

STATE OF MICHIGAN      )
                       )
COUNTY OF MACOMB       )

On July 14th, 2000 before me, a Notary Public, personally appeared Ronald A.
Klein the CEO of BINGHAM FINANCIAL SERVICES CORPORATION, a Michigan
corporation, personally known to me (or proved to me on the basis of
satisfactory evidence) to be the person whose name is subscribed to the within
instrument and acknowledged to me that he/she executed the same in his/her
authorized capacity, and that by his/her signature on the instrument the
person, or the entity upon behalf of which the person acted, executed the
instrument.

WITNESS my hand and official seal.

                                           /s/ Melissa Haskins
                                           ------------------------------------
                                           Notary Public

           (SEAL)                          (SEAL) My Commission Expires: 9-4-01
                                                                         ------

                                      -6-
<PAGE>   7
                                                                     EXHIBIT A-1

           FIRST AMENDED AND RESTATED WAREHOUSING PROMISSORY NOTE

$50,000,000                                                 Date:  July 21, 2000

         FOR VALUE RECEIVED, the undersigned, BLOOMFIELD ACCEPTANCE COMPANY,
L.L.C., a Michigan limited liability company ("Bloomfield Acceptance") and
BLOOMFIELD SERVICING COMPANY, L.L.C.,  a Michigan corporation ("Bloomfield
Servicing")(Bloomfield Acceptance and Bloomfield Servicing collectively,
hereinafter sometimes referred to as "Co-Borrowers"), hereby promise to pay to
the order of RESIDENTIAL FUNDING CORPORATION, a Delaware corporation (the
"Lender" or, together with its successors and assigns, the "Holder") whose
principal place of business is 8400 Normandale Lake Blvd., Suite 600,
Minneapolis, Minnesota 55437, or at such other place as the Holder may designate
from time to time, the principal sum of $50,000,000 or so much thereof as may be
outstanding from time to time pursuant to the Warehousing Credit and Security
Agreement described below, and to pay interest on said principal sum or such
part thereof as shall remain unpaid from time to time, from the date of each
Advance until repaid in full, and all other fees and charges due under the
Agreement, at the rates and at the times set forth in the Agreement.  All
payments hereunder shall be made in lawful money of the United States and in
immediately available funds.

         This Note is given to evidence an actual warehouse line of credit in
the above amount and is the Warehousing Promissory Note referred to in that
certain Warehousing Credit and Security Agreement ("the Agreement") dated the
date hereof between the Co-Borrowers and the Lender, as the same may be amended
or supplemented from time to time, and is entitled to the benefits thereof.
Reference is hereby made to the Agreement (which is incorporated herein by
reference as fully and with the same effect as if set forth herein at length)
for a description of the Collateral, a statement of the covenants and
agreements, a statement of the rights and remedies and securities afforded
thereby and other matters contained therein.  Capitalized terms used herein,
unless otherwise defined herein, shall have the meanings given them in the
Agreement.

         This Note is given in replacement for, and not in satisfaction of,
that certain Warehousing Promissory Note dated March 15, 2000 (the "Existing
Note") and is issued by the Company to evidence its Obligations under the
Agreement.  All amounts owed by the Company under the Existing Note (including,
without limitation, the unpaid principal thereunder, interest accrued thereon
and fees accrued under the Agreement whether or not yet due and owing) as of
the date hereof, shall be owed hereunder.

         This Note may be prepaid in whole or in part at any time without
premium or penalty.

         Should this Note be placed in the hands of attorney for collection,
the Co-Borrowers agree to pay, in addition to principal and interest, fees and
charges due under the Agreement, any and all costs of collecting this Note,
including reasonable attorneys' fee and expenses.

         The Co-Borrowers hereby waive demand, notice, protest and presentment.

         The promises and agreements herein shall be construed to be and are
hereby declared to be the joint and several promises and agreements of each
Co-Borrower and shall constitute the joint and several obligation of each
Co-Borrower and shall be fully binding upon and enforceable against each
Co-Borrower.  The release of any party to this Note shall not affect or release
the joint and several liability of any other party.  The Lender may at its
option enforce this Note against one or all of the Co-Borrower, and the Lender
shall

                                       1

<PAGE>   8
not be required to resort to enforcement against each Co-Borrower and the
failure to proceed against or join each Co-Borrower shall not affect the joint
and several liability of each Co-Borrower.

          This Note shall be construed and enforced in accordance with the laws
of the State of Minnesota, without reference to its principles of conflicts of
law.

          IN WITNESS WHEREOF, the Co-Borrowers have executed this Note as of
the day and year first above written.

                                   BLOOMFIELD ACCEPTANCE COMPANY, L.L.C.
                                   a Michigan limited liability company

                                   By:
                                       --------------------------------

                                   Its:
                                       --------------------------------

                                   BLOOMFIELD SERVICING COMPANY, L.L.C.
                                   a Michigan limited liability company

                                   By:
                                       --------------------------------

                                   Its:
                                       --------------------------------

                                       2

<PAGE>   9
STATE OF           )
                            )ss
COUNTY OF          )

     On             , 2000 before me, a Notary Public, personally
appeared          , the            of BLOOMFIELD ACCEPTANCE COMPANY, L.L.C., a
Michigan limited liability company, personally known to me (or proved to me on
the basis of satisfactory evidence) to be the person whose name is subscribed
to the within instrument and acknowledged to me that he/she executed the same
in his/her authorized capacity, and that by his/her signature on the instrument
the person, or the entity upon behalf of which the person acted, executed the
instrument.

     WITNESS my hand and official seal.

                                        ------------------
                                        Notary Public
                                        My Commission Expires:
                                                              ----------

(SEAL)

STATE OF           )
                            )ss
COUNTY OF          )

     On          , 2000 before me, a Notary Public, personally
appeared        , the               of BLOOMFIELD SERVICING COMPANY, L.L.C., a
Michigan limited liability company, personally known to me (or proved to me on
the basis of satisfactory evidence) to be the person whose name is subscribed
to the within instrument and acknowledged to me that he/she executed the same
in his/her authorized capacity, and that by his/her signature on the instrument
the person, or the entity upon behalf of which the person acted, executed the
instrument.

     WITNESS my hand and official seal.

                                        ------------------
                                        Notary Public
                                        My Commission Expires:
                                                              ---------

(SEAL)

                                       3
<PAGE>   10
                                                                       EXHIBIT M

--------------------------------------------------------------------------------
                              ELIGIBLE COLLATERAL
--------------------------------------------------------------------------------

All capitalized terms used herein and not otherwise defined shall have their
respective meanings set forth in the Agreement.

The following aggregate limitations will apply to Advances against Eligible
Loans:

1.  OTHER FANNIE MAE MORTGAGE LOAN

       (A) FLOATING RATE:               1.25% over LIBOR

       (B) BALANCE FUNDED RATE:         NONE

       (C) SECOND MORTGAGE LOAN:        Permitted.

       (D) SUBMIT:                      $50,000,000

       (E) COMMITTED/UNCOMMITTED:       Purchase Commitment required

       (F) ADVANCE RATE:                100% of the lesser of (i) the Mortgage
                                        Note Amount, or (ii) the Committed
                                        Purchase Price.

       (G) WAREHOUSE PERIOD:            90 days for cash transactions.
                                        80 days for an Agency Security issued
                                        by Fannie Mae.

       (H) SHIPPED PERIOD:              45 days for cash transactions.
                                        75 days for an Agency Security issued
                                        by Fannie.

2.  FREDDIE MAC MORTGAGE LOAN

       (A) FLOATING RATE:               1.25% over LIBOR.

       (B) BALANCE FUNDED RATE:         NONE

       (C) SECOND MORTGAGE LOAN:        Permitted

       (D) SUBLIMIT:                    $50,000,000

       (E) COMMITTED/UNCOMMITTED:       Purchase Commitment required

       (F) ADVANCE RATE:                100% of the lesser of (i) the Mortgage
                                        Note Amount, or (ii) the Committed
                                        Purchase Price.

       (G) WAREHOUSE PERIOD:            90 days.

       (H) SHIPPED PERIOD:              45 days.

<PAGE>   11
  3. NON-AGENCY MORTGAGE LOAN

     (a) FLOATING RATE:            1.25% over LIBOR.

     (b) BALANCE FUNDED RATE:      NONE

     (c) SECOND MORTGAGE LOAN:     Not Permitted

     (d) SUBLIMIT:                 $25,000,000.

     (e) COMMITTED/UNCOMMITTED:    Purchase Commitment required

     (f) ADVANCE RATE:             98% of the lesser of (i) the Mortgage Note
                                   Amount, or (ii) the Committed Purchase Price.

     (g) WAREHOUSE PERIOD:         60 days.

     (h) SHIPPED PERIOD:           45 days.

  4. BRIDGE MORTGAGE LOAN

     (a) FLOATING RATE:            2.00%, 2.25% or 2.50% over LIBOR*

     (b) BALANCE FUNDED RATE:      None.

     (c) SECOND MORTGAGE LOAN:     Not Permitted

     (d) SUBLIMIT:                 $25,000,000

     (e) COMMITTED/UNCOMMITTED:    Purchase Commitment not required

     (f) COMMITTED ADVANCE RATE:   At the Borrower's option, 85% or 80% of the
                                   Mortgage Note Amount.

     (g) WAREHOUSE PERIOD:         360 days from the date of the initial Advance
                                   against a Bridge Mortgage Loan, may be
                                   extended for up to an additional year
                                   assuming no Event of Default with the consent
                                   of Lender.

     (h) SHIPPED PERIOD:           45 days.

     * The margin over LIBOR is determined based on the following Matrix:
<TABLE>
<CAPTION>
--------------------------------------------------------------------------------
<S>                      <C>                           <C>
     ADVANCE RATE        DEBT SERVICE COVERAGE:        DEBT SERVICE COVERAGE:

                           >1.05 BUT LESS < 1.15              >1.15
--------------------------------------------------------------------------------

         85%                      2.50%                       2.25%
--------------------------------------------------------------------------------

         80%                      2.25%                       2.00%
--------------------------------------------------------------------------------
</TABLE><PAGE>   1

                                                                   EXHIBIT 10.3

                               SECURITY AGREEMENT

     THIS SECURITY AGREEMENT (the "Agreement") is made and entered into as of
December 13, 1999 by and between SUN COMMUNITIES OPERATING LIMITED PARTNERSHIP,
a Michigan limited partnership ("Lender"), whose address is 31700 Middlebelt
Road, Suite 145, Farmington Hills, Michigan 48334, and BINGHAM FINANCIAL
SERVICES CORPORATION, a Michigan corporation ("Borrower"), whose address is 260
East Brown Street, Suite 200, Birmingham, MI 48009.

     WHEREAS Borrower has obtained or may from time to time obtain loans or be
otherwise obligated to Lender and has agreed to secure its Obligations (as
defined in Section 1 below) to Lender by granting Lender security interests in
the personal property described in this Agreement.

     NOW THEREFORE Borrower and Lender agree as follows:

     1. GRANT OF SECURITY INTEREST. Borrower grants Lender a continuing
subordinated security interest in the collateral described in Section 2 below
(all of the personal property described in Section 2 is individually and
collectively referred to in this Agreement as the "Collateral"), to secure the
repayment of the loans Lender has made to Borrower under (a) that certain Loan
Agreement between Borrower and Lender dated March 1, 1998, as amended by that
certain First Amendment to Loan Agreement dated as of June 11, 1999 and (b) that
certain Loan Agreement between Borrower and Lender dated March 30, 1999
(including all renewals, extensions, modifications, or refinancings thereof),
together with any and all other obligations now or in the future owing from
Borrower to Lender (including future advances) (hereinafter collectively called
the "Obligations") together with all costs, expenses and reasonable attorneys'
fees incurred by Lender in the disbursement, administration and collection of
the Obligations or the protection, maintenance, and liquidation of the
Collateral. Borrower agrees not to sell the Collateral except in the ordinary
course of Borrower's business and will not assign, transfer, pledge, grant a
security interest in, or otherwise dispose of or encumber the Collateral without
Lender's prior written consent. The security interests in the Collateral granted
to the Lender under this Agreement shall be subordinate to and subject to any
lien or security interest that Lehman Brothers, Inc. (the "Senior Creditor") may
now or hereafter have in the Collateral as a result of any indebtedness (the
"Senior Indebtedness") owed to the Senior Creditor. Unless and until the Senior
Indebtedness has been satisfied in full, the Lender agrees that it will not in
any way enforce its security interest in the Collateral or interfere with the
Senior Creditor's security interest in the Collateral without the prior written
consent of the Senior Creditor. The Lender agrees from time to time to execute
and deliver subordination agreements or such other documents, in form and
substance mutually acceptable to Borrower, Lender and the Senior Creditor, as
the Senior Creditor may reasonable request to subordinate the security interest
granted in this Agreement to the Senior Creditor's security interest in the
Collateral.

     2. COLLATERAL. The Collateral covered by this Agreement is all of the
assets, whether tangible or intangible, and wherever located, which Borrower now
owns, in whole or in

                                      -1-

<PAGE>   2

part, in which Borrower has any interest whatsoever, or which Borrower shall
hereafter acquire or create, including, without limitation, the following:

              (a) all Accounts, contracts, documents, instruments and general
intangibles;

              (b) all Equipment and fixtures, including, without limitation, all
machinery, computers, furniture, furnishings and vehicles;

              (c) all of Borrower's Inventory;

              (d) the proceeds of such assets, the proceeds of all insurance and
eminent domain or condemnation awards relating to such assets, and all products
of and accessions to such assets.

For each and every type of Collateral described above, the proceeds of the
Collateral and the proceeds of all insurance, eminent domain, condemnation
awards, and all products of and all accessions and attachments to the Collateral
are also part of the Collateral. In addition, any and all bank deposits and bank
accounts or other sums at any time credited or due from Lender to Borrower and
any and all instruments, documents, policies, certificates of insurance,
securities, goods, accounts, chattel paper, cash, property and the proceeds
thereof which Borrower owns or in which Borrower has an interest and which are
at any time in the possession or control of Lender or any third party acting on
Lender's behalf, shall also be considered Collateral.

     3. PERFECTION OF SECURITY INTEREST. Borrower agrees to promptly execute and
deliver to Lender, concurrently with this Agreement and at any time hereafter at
Lender's request, all financing statements, assignments, certificates of title,
applications for motor vehicle titles, affidavits, reports, notices, schedules
of Accounts, designations of Inventory, letters of authority and any and all
other documents and agreements as Lender requests, in form satisfactory to
Lender, to perfect and to at all times maintain perfected Lender's security
interests in the Collateral. Borrower also agrees to make appropriate entries on
its books and records disclosing Lender's security interests in the Collateral.

     4. WARRANTIES. Borrower warrants to Lender, that: (a) Borrower has or
forthwith will acquire full legal title to the Collateral, is the lawful owner
of all of the Collateral, and, subject to the approval of the Senior Creditor,
has an the right to subject the Collateral to the Lender's security interest;
(b) Borrower does not conduct Borrower's business under any other name than
that given above, and agrees not to change or reorganize the business entity
under which it does business except upon the Lender's prior written approval;
(c) Borrower's records are located at the above address and Borrower agrees not
to remove any records concerning the Collateral from said address nor keep any
of its records at any other address unless at least ten (10) days prior written
notice is given to Lender of any new address; (d) Borrower has full authority,
complete power, and is duly authorized to enter into this Agreement with Lender;
and (e) there are no actions or proceedings either threatened or pending against
Borrower which might result in any material adverse change in Borrower's
financial condition or materially affect any of Borrower's assets. All of
Borrower's warranties contained in this Section 4 shall be

                                       -2-

<PAGE>   3

continuing warranties until Borrower has no remaining Obligations to Lender.

     5. TAXES, INSURANCE. Borrower agrees to: (a) promptly pay all taxes,
levies, assessments, judgments, and charges of any kind upon or relating to the
Collateral, to Borrower's business, and to Borrower's ownership or use of any of
its assets, income, or gross receipts; (b) at its own expense, keep all of the
Collateral fully insured against loss or damage by fire, theft, explosion and
other risks, in such amounts, with such companies, under such policies, and in
such form, as shall be satisfactory to Lender, a copy of which policies shall be
delivered to Lender with evidence of premium payment and which policies shall be
endorsed to provide Lender a standard loss payable clause with not less than 30
days notice of cancellation or of any change in coverage and the Lender shall
have a security interest in the proceeds of all such insurance and may apply any
such proceeds received by it toward payment of Borrower's Obligations, whether
or not due, in such order of application as Lender may determine; (c) maintain
at its own expense, public liability and property damage insurance in such
amounts, with such companies, under such policies, and in such form as shall be
satisfactory to Lender, and (d) upon Lender's request, shall furnish Lender with
original insurance policies and evidence that such policies have been paid and
maintained. If, after such request, the Lender does not promptly receive
evidence that any of the insurance coverages required by this paragraph are
being maintained, Lender may assume Borrower does not have the required
coverage. If Borrower at any time fails to obtain or maintain any of the
policies required above or pay any premium relating thereto, or fails to pay
any tax, assessment, levy or charge, or discharge any lien, claim, or
encumbrance, then Lender, without waiving or releasing any obligation or default
of Borrower hereunder, may at any time, but without obligation to do so, make
such payment, obtain such discharge, obtain and maintain policies of insurance,
pay such premiums, and take any other action as Lender deems advisable. All
sums disbursed by Lender, including reasonable attorney fees, court costs,
expenses, and other charges relating thereto, shall be part of the Obligations
secured hereby, shall be payable on demand, and shall bear interest until paid
at the highest rate of interest then being charged by and loaned from Lender to
Borrower. Upon Borrower's failure to obtain or maintain insurance upon the
Collateral, the Lender may assess a service charge for obtaining and servicing
the required insurance coverage.

     6. INFORMATION. Borrower agrees to permit Lender or Lender's agents to have
access to and inspect the Collateral, and from time to time verify Accounts,
Inventory, Equipment, and all other Collateral, and check, make copies of or
extracts from the books, records and files of Borrower, and Borrower shall
make same available at any time for such purposes. Borrower agrees to promptly
supply Lender with such financial and other information concerning its financial
and business affairs, assets and liabilities as Lender may from time to time
request, and Borrower agrees that Lender or its agents may from time to time
verify Borrower's continuing compliance with any of Borrower's warranties made
in Section 4 above, at Borrower's cost and expense.

     7. DEFAULT.

         (a) Except as otherwise provided in any promissory note, loan
agreement or other agreement secured by this Agreement, the occurrence of any of
the following events shall

                                      -3-

<PAGE>   4

constitute an Event of Default: (i) any failure to pay when due any amount
payable on any of the Obligations; (ii) any statement, warranty or
representation of Borrower made herein or in any other instrument, document,
agreement or financial statement is false or misleading in any material respect;
(iii) breach of any material covenant, term, condition, or agreement contained
herein or in any related instrument, document or agreement; (iv) Borrower ceases
doing business or Borrower's existence is terminated by, sale, dissolution,
merger or otherwise; (v) any conveyance is made of substantially all of
Borrower's assets, any assignment is made for the benefit of creditors, any
receiver is appointed, or any insolvency, liquidation, or reorganization
proceeding is filed by or against Borrower under the Bankruptcy Code or
otherwise; or (vi) any attachment, execution, levy, forfeiture, tax lien or
similar writ or process is issued against the Collateral or any other property
of Borrower.

              (b) Whenever an Event of Default shall exist, the Obligations may,
at Lender's option, and without demand or notice of any kind, be declared
immediately due and payable and the Lender may exercise all rights and remedies,
including the right to immediate possession of the Collateral, available to it
under applicable law. Lender shall have the right to hold any property then in
or upon the Collateral at time of repossession and not covered by this Agreement
until return is demanded in writing. Upon an Event of Default, Borrower agrees,
subject to the rights of the Senior Creditor, to assemble all the Collateral at
a convenient place acceptable to the Lender, and to pay all costs of collection
of the Obligations and enforcement of the Lender's rights, including reasonable
attorney fees, together with all Lender expenses in locating the Collateral and
repairs to any realty or other property to which any of the Collateral may be
affixed. Any notification of intended disposition of any of the Collateral
required by law shall be deemed reasonably and properly given if sent at least
seven (7) calendar days before such disposition, postage prepaid, addressed to
Borrower either at the address shown in this Agreement or at any other address
of Borrower appearing on the records of the Lender.

     8. GENERAL. Except as otherwise defined in this Agreement, all terms in
this Agreement shall have the meanings provided by the Michigan Uniform
Commercial Code, as amended from time to time. Any Lender delay in exercising
any power, privilege or right under this Agreement, or under any other
instrument or agreement executed in connection with this Agreement shall not
operate as a waiver thereof, and no single or partial exercise shall preclude
other or further exercise thereof, or the exercise of any other power,
privilege, or right. The Lender's waiver of any Event of Default shall not
constitute a waiver of any subsequent default, but shall be restricted only to
the default waived. All rights, remedies and powers of Lender under this
Agreement are irrevocable and cumulative and not alternative or exclusive, and
shall be in addition to all rights, remedies, and powers given in any other
instrument or agreement and by the Michigan Uniform Commercial Code. This
Agreement cannot be modified except by a writing signed by Borrower and by the
Lender.

     This Agreement has been delivered in Michigan, and shall be construed in
accordance with the laws of the State of Michigan. All rights and privileges of
the Lender under this Agreement shall inure to the benefit of its successors and
assigns, and this Agreement shall be binding on all heirs, executors,
administrators, and successors of Borrower.
                           [signature page attached]

                                      -4-

<PAGE>   5

     IN WITNESS WHEREOF Borrower and Lender have executed this Security
Agreement on the date first written above.

                                   BORROWER:

                                   BINGHAM FINANCIAL SERVICES
                                   CORPORATION, a Michigan corporation

                                   By: /s/ Ronald A. Klein
                                      -----------------------------

                                   Its: CEO
                                       ----------------------------

                                   LENDER:

                                   SUN COMMUNITIES OPERATING LIMITED
                                   PARTNERSHIP, a Michigan limited partnership

                                   By: Sun Communities, Inc., a Maryland
                                        corporation
                                   Its: General Partner

                                   By: /s/ Gary A. Shiffman
                                      -----------------------------

                                   Its: CEO
                                       ----------------------------

                                      -5-

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