Document:

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                                                                   EXHIBIT 10.30

                             CONTRIBUTION AGREEMENT

         This Contribution Agreement (this "Agreement") is entered into as of
this 31st day of May, 2000, by and between American Spectrum Realty, Inc., a
Maryland corporation (the "Company" or "American Spectrum"), and CGS Real Estate
Company, Inc. (the "Contributor").

                                    RECITALS:

         WHEREAS, American Spectrum, and the Contributor (the "Parties" and
individually, "Party") desire to enter into the Agreement as part of the
consolidation transaction set forth in the draft dated July 31, 2000 of the
registration statement of the Company on Form S-4 including all amendments
thereto (the "Registration Statement"), to be filed with the Securities and
Exchange Commission (the "SEC") pursuant to the Securities Act of 1933, as
amended (the "Securities Act"), of which the Prospectus/Consent Solicitation
Statement of the Company (the "Prospectus/Consent Solicitation Statement") is a
part; and

         WHEREAS, the Contributor desires to contribute to American Spectrum or
American Spectrum Realty Operating Partnership, L.P. ("the Operating
Partnership") and American Spectrum or the Operating Partnership desires to
acquire, as a result of this contribution, all of Contributor's right, title and
interest in and to the subject properties and assets more particularly described
in Section 2.1 hereto in exchange for American Spectrum Shares or Operating
Partnership Units; and

         WHEREAS, the Company's Articles of Incorporation and Bylaws permit, and
resolutions adopted by the Company's board of directors authorize this Agreement
and the consummation of the transfer of the assets pursuant to this Agreement
(the "Contribution"); and

         WHEREAS, the Operating Partnership's limited partnership agreement
permits this Agreement and the consummation of the transfer of the assets
pursuant to this Agreement (the "Contribution"); and

         WHEREAS, the Contributor has duly approved this Agreement and the
consummation of the Contribution; and

         WHEREAS, the Parties hereto anticipate that the Contribution will
further certain of their business objectives.

         NOW, THEREFORE, in consideration of the premises and the mutual
promises herein made, and in consideration of the representations, warranties,
and covenants herein contained, the receipt and sufficiency of which are
acknowledged, the Parties agree as follows:
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                                    ARTICLE I
                                   DEFINITIONS

         As used in this Agreement, the following terms shall have the
respective meanings set forth below:

         "Accredited Investor" has the meaning set forth in Section 8.1 below.

         "Affiliate" has the meaning set forth in Rule 12b-2 of the regulations
promulgated under the Securities Exchange Act of 1934, as amended.

         "Agreement" means this Agreement, as amended from time to time.

         "American Spectrum" has the meaning set forth in the Preface above.

         "American Spectrum Common Shares" shall mean the shares of common
stock, $.01 par value, of American Spectrum.

         "Articles of Incorporation" means the articles of incorporation of
American Spectrum.

         "Business Combination" has the meaning set forth in Section 3.1 below.

         "Bylaws" means the bylaws of American Spectrum.

         "Closing" has the meaning set forth in Section 2.3 below.

         "Closing Date" has the meaning set forth in Section 2.3 below.

         "Code" means the Internal Revenue Code of 1986, as amended.

         "Company" has the meaning set forth in the Preface above.

         "Contribution" has the meaning set forth in the Preface above.

         "Contributor" has the meaning set forth in the Preface above.

         "Exchange Agent" has the meaning set forth in Section 3.3 below.

         "Managing General Partner" means the managing general partner of the
Contributor where such Contributor is a limited partnership.

         "Managing Member" means the managing member of the Contributor where
such Contributor is a limited liability company.

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         "Material Adverse Effect" means, as to any Party, a material adverse
effect on the business, properties, operations or condition (financial or
otherwise) which is not related to any industry-wide change in the economy or
market or other conditions affecting all businesses in the industry of the Party
to which the term is applied.

         "Operating Partnership" has the meaning set forth in the Preface above.

         "Operating Partnership Unit Consideration" has the meaning set forth in
Section 3.1 below.

         "Operating Partnership Units" means limited partnership units of the
Operating Partnership.

         "Party" or "Parties" has the meaning set forth in the Preface above.

         "Person" means an individual, a partnership, a corporation, an
association, a joint stock company, a trust, a joint venture, a limited
liability company, an unincorporated organization, a governmental entity (or any
department, agency, or political subdivision thereof) or other entity.

         "Prospectus/Consent Solicitation Statement" has the meaning set forth
in the first paragraph of the Recitals above.

         "Registration Statement" has the meaning set forth in the first
paragraph of the Recitals above.

         "SEC" has the meaning set forth in the first paragraph of the Recitals
above.

         "Securities Act" has the meaning set forth in the first paragraph of
the Recitals above.

         "Share Consideration" has the meaning set forth in Section 3.1.

         "Stockholders" means stockholders of the Contributor.

         "Tax" means any federal, state, local, or foreign income, gross
receipts, license, payroll, employment, excise, severance, stamp occupation,
premium, windfall profits, environmental (including taxes under Code (S) 59A),
customs duties, capital stock, franchise, profits, withholding, social security
(or similar), unemployment, disability, real property, personal property, sales,
use, transfer, registration, value added, alternative or add-on minimum,
estimated, or other tax of any kind whatsoever, including any interest, penalty,
or addition thereto, whether disputed or not.

                                   ARTICLE II
                             CONTRIBUTION OF ASSETS

         2.1      Contribution and Assignment. Subject to the terms and
conditions hereinafter specified, Contributor agrees to contribute to American
Spectrum or the Operating Partnership and

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American Spectrum or the Operating Partnership agrees to acquire from
Contributor, as a result of this contribution to capital,

                  (a)      with respect to the real property owned by
Contributor and known as Phoenix Van Buren land and more particularly described
in Schedule 2.1 A hereto: Contributor's interest in that certain plot, piece and
parcel of land (the "Land") more particularly described in Exhibit 2.1 A hereto
(the Land being sometimes referred to as the "Premises") and all of
Contributor's right, title and interest in, to and under:

                           (i)      all easements, rights of way, privileges,
appurtenances, strips, gores, air rights and other rights pertaining to the
Premises, if any;

                           (ii)     any land lying in the bed of any street,
road, avenue, open or proposed, public or private, in front of or adjoining the
Premises or any portion thereof, to the center line thereof, and any award to be
made in lieu thereof and in and to any unpaid award for damage to the Premises
by reason of change of grade of any street occurring after the date of execution
and delivery of this Agreement;

                           (iii)    all the fixtures, furniture, furnishings,
equipment and other personal property owned by Contributor and used in
connection with the Premises (the Personalty");

                           (iv)     all of Contributor's right, title and
interest in and to all leases and other occupancy agreements for the leasing of
space at the Premises (collectively, the "Leases"), and all security deposits
under the Leases (collectively, the "Security Deposits") which have not been
applied by Contributor to the payment of past due amounts under the Leases in
accordance with the terms of the respective Leases (and which shall continue to
be held in accordance with the terms and conditions of the respective Leases);

                           (v)      all of Contributor's right, title and
interest in and to service, supply, security, maintenance, employment and all
other agreements, licenses or contracts (the "Contracts"), subject to any
consents required pursuant to the terms and provisions of such Contracts; and

                           (vi)     all certificates of occupancy and other
documents, permits, warranties, guarantees and approvals pertaining to the
operation of the Premises (collectively, the "Permits"; the Premises, the
Personalty, the Leases, the Security Deposits, the Contracts and the Permits
being hereinafter collectively referred to as the "Property").

                  (b)      all of Contributor's or its subsidiaries right, title
and interest in and to all of the then outstanding shares of capital stock or
ownership interests of each of the entities listed on Schedule 2.1B hereto;

                  (c)      the personal property, furniture, fixtures, and
equipment used in connection with, and necessary for the conduct of the business
of the Company (the "Business") including those listed on Schedule 2.1C hereto;

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                  (d)      the contracts, leases, commitments and agreements
listed on Schedule 2.1D hereto;

                  (e)      the cash and accounts receivables included on the
Company's balance sheet at March 31, 2001, as the same may have increased or
decrease in the ordinary course of business subsequent to March 31, 2001;

                  (f)      all other claims and rights of every kind associated
with the Business;

                  (g)      the right to employ the employees set forth on
Schedule 2.1F, each of which shall become employee of the Company on the date of
the Closing;

                  (h)      all proprietary rights and licenses of the
Contributor relating to or arising out of the Business; and

                  (i)      all books and records, computers and computer
software (including documentation and related object and source codes),
correspondence, employment records and files of or relating to the Business

         Notwithstanding anything to the contrary contained herein, the assets
transferred hereunder shall not include the assets used in connection with the
business of CGS Management Company which are being transferred to American
Spectrum Management Company, Inc. pursuant to a separate contribution agreement.

         2.2      Assumption of Liabilities.

                  Upon the Closing, the Company shall assume and become liable
for:

                  (a)      All liabilities and obligations of the Contributor
which are reflected in the balance sheet dated March 31, 2001;

                  (b)      All accounts payable arising since the date of the
balance sheet dated March 31, 2001 incurred in the ordinary course of business,
consistent with past practice and consistent in type and scope to those
reflected in such balance sheet;

                  (c)      All liabilities and obligations of the Contributor
under the contracts, leases, agreements and commitments listed in Schedule 2.1D;
and

                  (d)      the liabilities and obligations listed on Schedule
2.2.

         The liabilities referred to in Section 2.2 are collectively referred to
as the "Assumed Liabilities".

         2.3      (a)      The Closing. The closing of the transactions
contemplated by this Agreement (the "Closing") shall take place at the offices
of Proskauer Rose LLP, 1585 Broadway, New York,

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New York simultaneously with the Closing of the Consolidation pursuant to the
Prospectus/Consent Solicitation Statement (the "Closing Date"), but in no event
later than December 31, 2001, unless extended by the mutual agreement of the
Parties.

                  (b)      The transfer of the Assets as herein provided shall
be effected by deeds, bills of sale, endorsements, assignments, stock
certificates duly endorsed for transfer, drafts, checks and other instruments of
transfer and conveyance delivered by Contributor to the Company on the Closing
Date in form sufficient to transfer title to the Assets and as shall be
reasonably requested by the Company.

                  (c)      Assumption Agreement; Effect. The assumption by the
Company of the Assumed Liabilities shall be effected by such instrument or
instruments of assumption delivered by the Company to the Contributor on the
Closing Date as shall be reasonably requested by the Contributor (the
"Assumption Agreement"). Assumption by the Company of the Assumed Liabilities
shall in no way expand the rights or remedies of third parties against the
Company as compared to the rights or remedies which such parties would have
against the Contributor had this Agreement not been consummated. Except as
specifically set forth in Section 2.2, the Company does not assume or agree to
pay, perform or discharge any other obligations or liabilities of the
Contributor, whether or not related to the Business. Without limiting the
foregoing, in no event shall Buyer be liable for, assume, perform or discharge
the following: (w) any liabilities arising from breaches of any contracts or
agreements of the Contributor or violations of any permits, licenses or
approvals granted to the Contributor by a governmental body; (x) any liabilities
arising from any claims, actions, suits, proceedings or investigations existing
prior to the Closing or arising out of events occurring prior to the Closing
against the Contributor or any affiliate of the Contributor, at law or in equity
or before or by any federal, state, municipal, local, or foreign government or
other governmental body; (y) any federal, state or local income tax or
withholding or other taxes payable by the Contributor including, without
limitation, any federal, state or local income taxes imposed or levied on, or
otherwise assessed against the Contributor, incident to or arising out of the
transactions contemplated by this Agreement; or (z) any liabilities arising
under EISA.

         2.4      Parties to the Contribution. The Contribution shall be to
American Spectrum or the Operating Partnership, as shall be determined by the
Contributor with the consent of American Spectrum, which consent shall not be
unreasonably withheld.

                                   ARTICLE III
                                  CONSIDERATION

         3.1      Share Consideration. (a) At the Closing, the Contributor will
be issued American Spectrum Common Shares (the "Share Consideration") or
Operating Partnership Units (the "Operating Partnership Unit Consideration") in
such amounts as shall be determined in accordance with the final
Prospectus/Consent Solicitation Statement. The Contributor acknowledges that the
amounts and terms may be different from that set forth in the draft
Prospectus/Consent Solicitation Statement.

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         (b)      Prior to the Closing, if American Spectrum splits or combines
American Spectrum Common Shares; or pays a stock dividend or other stock
distribution in American Spectrum Common Shares, or in rights or securities
exchangeable or convertible into or exercisable for American Spectrum Common
Shares, or otherwise changes the American Spectrum Common Shares into, or
exchanges the American Spectrum Common Shares for, any other securities (whether
pursuant to or as part of a merger, consolidation, acquisition of property or
stock, separation, reorganization, or liquidation of American Spectrum as a
result of which American Spectrum stockholders receive cash, stock, or other
property in exchange for, or in connection with, their American Spectrum Common
Shares (a "Business Combination") or otherwise)), then the American Spectrum
Common Shares or Operating Partnership Units to be received by the Contributor
will be appropriately adjusted to reflect such event.

         3.2      Fractional American Spectrum Common Shares. No certificates
representing fractional American Spectrum Common Shares or fractional Operating
Partnership Units shall be issued. Each Stockholder who would otherwise be
entitled to a fractional American Spectrum Common Shares or fractional Operating
Partnership Units will receive one American Spectrum Common Share or Operating
Partnership Unit for each fractional interest representing 50% or more of one
American Spectrum Common Share or Operating Partnership Unit. No American
Spectrum Common Shares or Operating Partnership Unit will be issued for a
fractional interest representing less than 50% of an American Spectrum Common
Share or Operating Partnership Unit.

         3.3      Issuance of Shares and Operating Partnership Units. American
Spectrum shall designate an exchange agent (the "Exchange Agent") to act as such
in connection with the issuance of certificates representing the American
Spectrum Common Shares and Operating Partnership Units pursuant to this
Agreement.

                                   ARTICLE IV
               REPRESENTATIONS AND WARRANTIES OF AMERICAN SPECTRUM
                          AND THE OPERATING PARTNERSHIP

         American Spectrum represents and warrants to the Stockholders and the
Contributor that the statements contained in this Article IV are correct and
complete as of the date hereof:

         4.1      Organization, Qualification and Corporate Power. American
Spectrum is a corporation duly organized, validly existing, and in good standing
under the laws of Maryland, as set forth in the Preface. American Spectrum is
duly authorized to conduct business and is in good standing under the laws of
each jurisdiction where such qualification is required, except where failure to
so qualify or obtain authorization would not have a Material Adverse Effect on
American Spectrum. The Operating Partnership is a limited partnership duly
organized, validly existing and in good standing under the laws of Delaware, as
set forth in the Preface. The Operating Partnership is duly authorized to
conduct business and is in good standing under the laws of each jurisdiction
where such qualification is required, except where failure to so qualify or
obtain authorization would not have a Material Adverse Effect on the Operating
Partnership.

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         4.2      Authorization for Common Stock. The Share Consideration and
the Operating Partnership Units will, when issued, be duly authorized, validly
issued, fully paid and nonassessable, and no stockholder or partner of American
Spectrum will have any preemptive right or similar rights of subscription or
purchase in respect thereof.

         4.3      Authorization of Transaction. American Spectrum and the
Operating Partnership have full power and authority (including full corporate
and limited partnership power and authority) to execute and deliver this
Agreement and to perform their obligations hereunder. The execution, delivery
and performance by American Spectrum and the Operating Partnership of this
Agreement has been duly and validly authorized by the board of directors of
American Spectrum. This Agreement constitutes the valid and legally binding
obligation of American Spectrum or the Operating Partnership, enforceable in
accordance with its terms and conditions. Neither American Spectrum nor the
Operating Partnership is required to give any notice to, make any filing with,
or obtain any authorization, consent, or approval of any government or
governmental agency in order to consummate the transactions contemplated by this
Agreement, except in connection with the federal securities laws, the Hart Scott
Rodino Act, if applicable, and any applicable "Blue Sky" or state securities
laws.

                                    ARTICLE V
                    REPRESENTATIONS AND WARRANTIES CONCERNING
                                 THE CONTRIBUTOR

         The Contributor represents and warrants to American Spectrum and the
Operating Partnership that the statements contained in this Article V are
correct and complete as of the date hereof.

         5.1      Organization, Qualification and Corporate Power. The
Contributor is duly authorized to conduct business and is in good standing under
the laws of each jurisdiction where such qualification is required, except where
failure to so qualify or obtain authorization would not have a Material Adverse
Effect on the Contributor.

         5.2      Authorization of Transaction. The Contributor has full power
and authority to execute and deliver this Agreement and to perform its
obligations hereunder. This Agreement constitutes the valid and legally binding
obligation of the Contributor, enforceable in accordance with its terms and
conditions. The Contributor is not required to give any notice to, make any
filing with, or obtain any authorization, consent or approval of any
governmental agency in order to consummate the transactions contemplated by this
Agreement, except in connection with federal securities laws, the Hart Scott
Rodino Act, if applicable, and any applicable "Blue Sky" or state securities
laws.

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         5.3      Investment Representation.

                  (a)      Each of the Stockholders of the Contributor, by
reason of its business and financial experience

                           (i)      has such knowledge, sophistication and
experience in financial and business matters and in making investment decisions
of this type that it is capable of evaluating the merits and risks of and of
making an informed investment decision with respect to an investment in American
Spectrum Common Shares or Operating Partnership Units,

                           (ii)     is capable of protecting its own interest,
and

                           (iii)    is capable of bearing the economic risk of
such investment.

                  (b)      Each of the Stockholders of the Contributor is an
"accredited investor" as defined in Rule 501 of the regulations promulgated
under the Securities Act of 1933.

                  (c)      (i)      Each of the Stockholders of the Contributor
understands that an investment in American Spectrum or the Operating Partnership
involves substantial risks.

                           (ii)     Each of the Stockholders of the Contributor
has been given the opportunity to make a thorough investigation of the proposed
activities of American Spectrum and the Operating Partnership.

                           (iii)    Each of the Stockholders of the Contributor
has had an opportunity to ask questions of and receive answers from
representatives of American Spectrum or the Operating Partnership concerning
American Spectrum and the Operating Partnership and their proposed activities
and the terms and conditions of an investment in American Spectrum Common Shares
or Operating Partnership.

                  (d)      The American Spectrum Common Shares or Operation
Partnership Units to be issued to the Stockholders of the Contributor at the
Closing will be acquired by each Stockholder for its own account for investment
only and not with a view to, or with any intention of, a distribution or resale
thereof, in whole or in part, or the grant of any participation therein.

                  (e)      The Contributor acknowledges that

                           (i)      the American Spectrum Shares or Operating
Partnership Units to be issued at the Closing have not been registered under the
Securities Act of 1933 or state securities laws by reason of a specific
exemption or exemptions from registration under the Securities Act of 1933 and
applicable state securities laws and, if such American Spectrum Common Shares or
Operating Partnership Units are represented by certificate, such certificates
will bear a legend to such effect,

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                           (ii)     American Spectrum and the Operating
Partnership's reliance on such exemptions is predicated in part on the accuracy
and completeness of the representations and warranties contained herein,

                           (iii)    the American Spectrum Common Shares or
Operating Partnership Units to be issued at the Closing may not be resold or
otherwise distributed unless registered under the Securities Act of 1933 and
applicable state securities laws, or unless an exemption from registration is
available,

                           (iv)     there is no public market for such American
Spectrum Common Shares or Operating Partnership Units, and

                           (v)      Neither American Spectrum nor the Operating
Partnership has any obligations or intention to register such American Spectrum
Common Shares or Operating Partnership Units under the Securities Act of 1933 or
any state securities laws or to take any action that would make available any
exemption from the registration requirements of such laws, except as provided in
the Registration Rights Agreement (referred to below).

                  (e)      The Contributor hereby acknowledges that because of
the restrictions on the transfer or assignment, each Stockholder may have to
bear the economic risk of the investment commitment evidenced by this Agreement
and any of the American Spectrum Common Shares or Operating Partnership Units
issued hereunder for an indefinite period of time, although, if applicable,

                           (i)      under the terms of the Exchange Rights
Agreement, Operating Partnership Units will, subject to the limitations set
forth in the Exchange Rights Agreement, be exchangeable at the request of the
holder thereof at any time after the first anniversary of their issuance for
cash based on their fair market value or, at the option of American Spectrum,
for American Spectrum Common Shares, and

                           (ii)     the holder of any such American Spectrum
Common Shares issued upon exchange of Units will be afforded certain rights to
have such American Spectrum Common Shares registered under the Securities Act of
1933 and applicable state securities laws pursuant to the Registration Rights
Agreement.

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                                   ARTICLE VI
                              PRE-CLOSING COVENANTS

         The Parties agree as follows with respect to the period between the
execution of this Agreement and the Closing:

         6.1      General. Each of the Parties will use its reasonable best
efforts to take all action and to do all things necessary, proper or advisable
in order to consummate and make effective the transactions contemplated by this
Agreement (including satisfaction, but not waiver, of the closing conditions set
forth in Article VII below).

         6.2      Notices and Consents. Each of the Parties shall give any
notices to, make any filings with, and use its reasonable best efforts to obtain
any authorizations, consents, and approvals of governments and governmental
agencies in connection with the matters referred to in Sections 8.1 below.

         6.3      Execution of Instruments. The Contributor shall have executed
the instruments set forth in Section 8.1(g) to (i) and 8.3 (if applicable) below
and all instruments reasonably requested by the Company to transfer the assets
and properties pursuant to this Agreement.

         6.4      American Spectrum shall execute the documents to be executed
by it pursuant to Section 8.1(g) and (h) below.

                                   ARTICLE VII
                             POST-CLOSING COVENANTS

         The Parties agree as follows with respect to the period following the
Closing:

         7.1      General. In the event that at any time after the Closing any
further action is necessary or desirable to carry out the purposes of this
Agreement, each of the Parties will take such further action (including the
execution and delivery of such further instruments and documents) as any other
Party reasonably may request, all at the sole cost and expense of the requesting
Party. The Contributor acknowledges and agrees that from and after the Closing,
American Spectrum or the Operating Partnership will be entitled to possession of
all documents, books, records (including Tax records), agreements and financial
data of any sort relating to the Contributor but will provide the Contributor
with reasonable access to such documents, books and records upon request.

         7.2      Litigation Support. In the event and for so long as any Party
actively is contesting or defending against any action, suit, proceeding,
hearing, investigation, charge, complaint, claim, or demand in connection with
(i) any transaction contemplated under this Agreement or (ii) any fact,
situation, circumstance, status, condition, activity, practice, plan,
occurrence, event, incident, action, failure to act, or transaction on or prior
to the Closing Date involving the Contributor, the other Party

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will cooperate with him and his counsel in the contest or defense, make
available their personnel, and provide such testimony and access to their books
and records as shall be necessary in connection with the contest or defense, all
at the sole cost and expense of the contesting or defending Party.

         7.3      Share Registration. American Spectrum shall use commercially
reasonable efforts to register the American Spectrum Common Shares promptly
following the first anniversary of the consummation of the Merger.

                                  ARTICLE VIII
                        CONDITIONS TO OBLIGATION TO CLOSE

         8.1      Conditions to Each Party's Obligation. The respective
obligations of American Spectrum or the Operating Partnership, the Stockholders
and the Contributor to consummate the transactions contemplated by this
Agreement are subject to the fulfillment at or prior to the Closing Date of each
of the following conditions, which conditions may be waived upon the written
consent of American Spectrum or the Operating Partnership and the Stockholders:

                  (a)      Consents. The Parties shall have obtained all
consents of third parties required in connection with the consummation of the
transaction contemplated hereby.

                  (b)      Governmental Approvals. The Parties shall have
received all other authorizations, consents, and approvals of governments and
governmental agencies required in connection with the consummation of the
transaction contemplated hereby.

                  (c)      No Injunction or Proceedings. There shall not be an
unfavorable injunction, judgment, order, decree, ruling, or charge would, in the
reasonable judgment of American Spectrum, prevent consummation of any of the
transactions contemplated by this Agreement.

                  (d)      No Suspension of Trading, Etc. At the Closing, there
shall be no declaration of a banking moratorium by federal or state authorities
or any suspension of payments by banks in the United States (whether mandatory
or not) or of the extension of credit by lending institutions in the United
States, or commencement of war or other international, armed hostility or
national calamity directly or indirectly involving the United States, which war,
hostility or calamity (or any material acceleration or worsening thereof), in
the sole judgment of American Spectrum, would have a Material Adverse Effect on
the Contributor or, in the sole judgment of the Stockholders, would have a
Material Adverse Effect on American Spectrum.

                  (e)      The Consolidation pursuant to the Prospectus/Consent
Solicitation Statement shall have closed or be closing simultaneously with the
Closing.

                  (f)      American Spectrum Common Shares shall have been
approved for listing on notice of issuance on a national securities exchange
acceptable to American Spectrum.

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                  (g)      Registration Rights Agreement. A registration rights
agreement or customary terms, pursuant to which American Spectrum agrees to use
commercially reasonable efforts to register the American Spectrum Common Shares
issued or issuable in exchange for Operating Partnership Units shall have been
executed and delivered hereto.

                  (h)      Exchange Rights Agreement. An exchange rights
agreement on customary terms shall have been entered into by the parties hereto,
which shall permit exchange of the Operating Partnership Units for American
Spectrum Common Shares subject to customary limitations on and after the first
anniversary of the Closing, shall have been executed and delivered.

                  (i)      Investment Representation Letter. Each of the
Stockholders of the Contributor shall execute a customary investment
representation letter with respect to the matters set forth in Section 5.3.

                  (j)      Transfer Tax Returns. The Parties shall deliver any
required transfer tax returns.

                  (k)      "Non-Foreign Person Affidavit". The Parties shall
deliver a "non-foreign person affidavit" as required by Internal Revenue Code
Section 1445, substantially in the form attached hereto as Exhibit I.

         8.2      Conditions to Obligation of the Contributor. The obligations
of the Contributor to consummate the transactions contemplated hereby and take
the actions to be performed by it in connection with the Closing are subject to
satisfaction of the following additional conditions:

         American Spectrum or the Operating Partnership shall have delivered to
the Stockholders the Share Consideration or Limited Partnership Unit
Consideration pursuant to Section 3.1.

         8.3      Conditions to Obligation of the Operating Partnership. The
obligations of the Operating Partnership to consummate the transactions
contemplated hereby and take the actions to be performed by it in connection
with the Closing are subject to satisfaction of the following additional
condition:

         The Stockholders of the Contributor shall have executed the signature
page of the Agreement of Limited Partnership of the Operating Partnership and
such other documents as shall be necessary for admission as a limited partner of
the Operating Partnership.

                                   ARTICLE IX
                                   TERMINATION

         9.1      Termination by Mutual Consent. This Agreement may be
terminated and the Merger may be abandoned, before or after the approval of the
Stockholders of the Contributor or American Spectrum or the Operating
Partnership, respectively, either by the mutual written consent of

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American Spectrum or the Operating Partnership and the Contributor or by the
mutual action of the board of directors of American Spectrum or the general
partner of the Operating Partnership, and the Managing General Partner or
Managing Member of the Contributor.

         9.2      Termination by Either American Spectrum or the Operating
Partnership or by the Contributor. This Agreement may be terminated and the
Contribution may be abandoned (a) by action of American Spectrum or the
Operating Partnership in the event of a failure of a condition to the
obligations of American Spectrum and the Operating Partnership set forth in
Section 7.1 of this Agreement; (b) by the Managing General Partner or the vote
of a majority in interest of the Stockholders of the Contributor in the event of
a failure of a condition to the obligations of the Contributor set forth in
Section 7.1 or 7.2 of this Agreement; or (c) if a United States or federal or
state court of competent jurisdiction or United States federal or state
governmental agency shall have issued an order, decree or ruling or taken any
other action permanently restraining, enjoining or otherwise prohibiting the
transactions contemplated by this Agreement and such order, decree, ruling or
other action shall have become final and non-appealable; provided, in the case
of a termination pursuant to clause (a) or (b) above, that the terminating party
shall not have breached in any material respect its obligations under this
Agreement in any manner that shall have proximately contributed to the
occurrence of the failure referred to in said clause.

         9.3      Effect of Termination and Abandonment. In the event of
termination of this Agreement and abandonment of the Contribution pursuant to
this Article IX, no Party hereto (or any of its directors, officers, Managing
General Partners, Managing Members, Limited Stockholders) shall have any
liability or further obligation to any other Party to this Agreement, except
that nothing herein will relieve any Party from liability for any breach of this
Agreement.

                                    ARTICLE X
                                  MISCELLANEOUS

         10.1     No Third-Party Beneficiaries. This Agreement shall not confer
any rights or remedies upon any Person other than the Parties and their
respective successors and permitted assigns.

         10.2     Entire Agreement. This Agreement (including the documents
referred to herein) constitutes the entire agreement among the Parties and
supersedes any prior understandings, agreements, or representations by or among
the Parties, written or oral, to the extent they related in any way to the
subject matter hereof.

         10.3     Succession and Assignment. This Agreement shall be binding
upon and inure to the benefit of the Parties named herein and their respective
successors and permitted assigns. No Party may assign either this Agreement or
any of its rights, interests, or obligations hereunder without the prior written
approval of American Spectrum or the Operating Partnership and the Stockholders;
provided, however, that American Spectrum or the Operating Partnership may (i)
assign any or all of its rights and interests hereunder to one or more of its
Affiliates and (ii) designate one or more of its Affiliates to perform its
obligations hereunder (in any or all of which cases American Spectrum

                                       14
<PAGE>   15
or the Operating Partnership nonetheless shall remain responsible for the
performance of all of its obligations hereunder).

         10.4     Counterparts. This Agreement may be executed in one or more
counterparts, each of which shall be deemed an original but all of which
together will constitute one and the same instrument.

         10.5     Headings. The section headings contained in this Agreement are
inserted for convenience only and shall not affect in any way the meaning or
interpretation of this Agreement.

         10.6     Notices. All notices, requests, demands, claim, or other
communication hereunder shall be deemed duly given, as of the date two business
days after mailing, if it is sent by registered or certified mail, return
receipt requested, postage prepaid, and addressed to the intended recipient as
set forth below:

         If to the Contributor:

         c/o William J. Carden
         Chief Executive Officer
         American Spectrum Realty, Inc.
         1800 East Deere Avenue
         Santa Ana, California  92705

         With copy to:

         Proskauer Rose LLP
         1585 Broadway
         New York, NY  10036
         Attn:  Peter M. Fass, Esq.
         Telecopy:  (212) 969-2900

         If to American Spectrum:

         William J. Carden
         Chief Executive Officer
         American Spectrum Realty, Inc.
         1800 East Deere Avenue
         Santa Ana, California  92705

                                       15
<PAGE>   16
         With copy to:

         Proskauer Rose LLP
         1585 Broadway
         New York, NY  10036
         Attn:  Peter M. Fass, Esq.
         Telecopy:  (212) 969-2900

         If to the Operating Partnership:

         American Spectrum Realty Operating Partnership, L.P.
         c/o William J. Carden
         Chief Executive Officer
         American Spectrum Realty, Inc.
         1800 East Deere Avenue
         Santa Ana, California  92705

         With copy to:

         Proskauer Rose LLP
         1585 Broadway
         New York, NY  10036
         Attn:  Peter M. Fass, Esq.
         Telecopy:  (212) 969-2900

Any Party may send any notice, request, demand, claim or other communication
hereunder to the intended recipient at the address set forth above using any
other means (including personal delivery, expedited courier, messenger service,
telecopy, telex, ordinary mail, or electronic mail), but no such notice,
request, demand, claim, or other communication shall be deemed to have been duly
given unless and until it actually is received by the intended recipient. Any
Party may change the address to which notices, requests, demands, claims, and
other communications hereunder are to be delivered by giving the other Party
notice in the manner herein set forth.

         10.7     Governing Law. This Agreement shall be governed and construed
in accordance with the laws of the State of Maryland without giving effect to
any choice or conflict of law provision or rules (whether of the State of
Maryland or any other jurisdiction) that would cause the application of the laws
of any jurisdiction other than the State of Maryland.

         10.8     Amendments and Waivers. No amendment of any provision of this
Agreement shall be valid unless the same shall be in writing and signed by
American Spectrum and the Contributor. No waiver by any party of any default,
misrepresentation, or breach of warranty or covenant hereunder, whether
intentional or not, shall be deemed to extend to any prior or subsequent
default, misrepresentation, or breach of warranty or covenant hereunder or
affect in any way any rights arising by virtue of any prior or subsequent such
occurrence.

                                       16
<PAGE>   17
         10.9     Severability. Any term or provision of this Agreement that is
invalid or unenforceable in any situation in any jurisdiction shall not affect
the validity or enforceability of the remaining terms and provisions hereof or
the validity or enforceability of the offending term or provision in any other
situation or in any other jurisdiction.

         10.10    Expenses. Each of the Parties will bear its own costs and
expenses (including legal fees and expenses) incurred in connection with this
Agreement and the transactions contemplated hereby, except to the extent set
forth in the Prospectus/Consent Solicitation Statement.

         10.11    Construction. The Parties have participated jointly in the
negotiation and drafting of this Agreement. In the event an ambiguity or
question of intent or interpretation arises, this Agreement shall be construed
as if drafted jointly by the Parties and no presumption or burden of proof shall
arise favoring or disfavoring any Party by virtue of the authorship of any of
the provisions of this Agreement. Any reference to any federal, state, local or
foreign statute or law shall be deemed also to refer to all rules and
regulations promulgated thereunder, unless the context requires otherwise. The
word "including" shall mean including without limitation. The Parties intend
that each representation, warrant, and covenant contained herein in any respect,
the fact that there exists another representation, warranty, or covenant
contained herein in any respect, the fact that there exists another
representation, warranty, or covenant relating to the same subject matter
(regardless of the relative levels of specificity) which the Party has not
breached shall not detract from or mitigate the fact that the Party is in breach
of the first representation, warranty or covenant.

         10.12    Specific Performance. Each of the Parties acknowledges that
the other Party would be damaged irreparably in the event any of the provisions
of this Agreement are not performed in accordance with their specific terms or
otherwise are breached. Accordingly, each of the Parties agrees that the other
Party shall be entitled to an injunction or injunctions to prevent breaches of
the provisions of this Agreement and to enforce specifically this Agreement and
the terms and provisions hereof in any action instituted in any court of the
United States or any state thereof having jurisdiction over the Parties and the
matter (subject to the provisions set forth in Section 10.13 below), in addition
to any other remedy to which they may be entitled, at law or in equity.

         10.13    Submission to Jurisdiction. Each of the Parties submits to the
jurisdiction of any state or federal court sitting in the State of California,
in any action or proceeding arising out of or relating to this Agreement and
agrees that all claims in respect of the action or proceeding may be heard and
determined in any such court.

         10.14    Further Assurances; Further Actions. Each of the parties
shall, without further consideration, take such action and execute and deliver
such documents as may be necessary to carry out this agreement.

                   REMAINDER OF PAGE INTENTIONALLY LEFT BLANK

                                       17
<PAGE>   18
         IN WITNESS WHEREOF, the Parties have executed this Agreement as of the
date first above written.

                                            AMERICAN SPECTRUM REALTY, INC.

                                            By:  _______________________________
                                                 Name
                                                 Title

                                            CGS REAL ESTATE COMPANY, INC.

                                            By:  _______________________________
                                                 Name
                                                 Title

                                       18
<PAGE>   19
                                  Schedule 2.1B

1.       all of the capital stock of American Spectrum Properties, Inc.

2.       the 99% limited partnership interest in Pasadena Autumn Ridge LP

3.       the 1% general partnership interest owned by S.P. Properties Inc. in
         Pasadena Autumn Ridge LP

4.       the 100% membership interest in Villa Redondo LLC

                                        i
<PAGE>   20
                                  Schedule 2.1C

           MRI - accounting software                                1

           Computers - PC                                           8

           Network Servers - computers                              2

           Fax machines - personal style                            5

           Computer Printers                                        7

           File Cabinets (4 drawer)                                24

           File Cabinets (2 drawer)                                15

           Office Desks                                             3

           Credenza                                                 2

           Chairs                                                  10

           Conference Room tables                                   1

           Conference Room chairs                                   4

                                       ii
<PAGE>   21
                                  Schedule 2.1D

Office Lease for 1800 Deere Ave.

Lease with GECC for three copiers

Lease with Pitney Bowes for postage machines

Lease with Intermedia for phone equipment

Maintenance Contract with Pitney Bowes for copiers

Service Contract for building maintenance

Service Contract for mail services

                                       iii
<PAGE>   22
                                  Schedule 2.2

Notes to the following payees in the amounts set forth below, at December 31,
2000, plus any interest accrued in the ordinary course of business subsequent to
such dates:

<TABLE>
<S>                                                                  <C>
Notes payable by CGS Real Estate Company, Inc.

IDM Participating Income Company-- II                                $1,643,530

Metwest Life                                                         $1,300,000

Donna and Kurt Sabstaso                                                $500,000

John Galardi                                                         $1,300,000

Bank of America                                                        $459,000

First Insurance Funding                                                $114,090

Hobbs Group LLC                                                         $47,544

ASJ, Ltd.                                                               $26,474

John Nooney                                                             $95,620

Don Musick                                                             $250,000

Notes payable by American Spectrum -- Midwest

Bank of America                                                      $1,222,058

Lindell Bank & Trust Co.                                               $107,712

Wolken Agreement                                                       $416,667

Sierra Pacific Development Fund II                                   $1,073,460

Sierra Mira Mesa Partners                                            $2,696,350

Notes payable from SP Properties Inc.

O'Connor                                                               $121,627

Due to limited partnerships as a deficit restoration                   $191,795
</TABLE>

                                       iv<PAGE>   1
                                                                   Exhibit 10.31

                         CONTRIBUTION AGREEMENT (STOCK)
                              TO AMERICAN SPECTRUM

         This Agreement and Plan of Contribution (this "Agreement") is entered
into as of this 31st day of May, 2000, by and between American Spectrum Realty,
Inc., a Maryland corporation (the "Company" or "American Spectrum") and American
Spectrum Real Estate Services, Inc. (collectively the "Contributor").

                                    RECITALS:

         WHEREAS, American Spectrum and the Contributor (the "Parties," and
individually, a "Party") hereto desire to enter into the Agreement as part of
the consolidation transaction set forth in the draft dated July 31, 2000 of the
registration statement of the Company on Form S-4 including all amendments
thereto (the "Registration Statement"), to be filed with the Securities and
Exchange Commission (the "SEC") pursuant to the Securities Act of 1933, as
amended (the "Securities Act"), of which the Prospectus/Consent Solicitation
Statement of the Company (the "Prospectus/Consent Solicitation Statement") is a
part; and

         WHEREAS, the Contributor desires to contribute to American Spectrum,
and American Spectrum desires to acquire, as a result of this contribution, all
of Contributor's right, title and interest in and to the capital stock of
American Spectrum Management Company, Inc. (the "Management Company") in
exchange for American Spectrum Shares; and

         WHEREAS, the Company's Articles of Incorporation and Bylaws permit, and
resolutions adopted by the Company's board of directors authorize this Agreement
and the consummation of the transfer of the property pursuant to this Agreement
(the "Contribution"); and

         WHEREAS, the Contributor has duly approved this Agreement and the
consummation of the Contribution; and

         WHEREAS, the Parties hereto anticipate that the Contribution will
further certain of their business objectives.

         NOW, THEREFORE, in consideration of the premises and the mutual
promises herein made, and in consideration of the representations, warranties,
and covenants herein contained, the receipt and sufficiency of which are
acknowledged, the Parties agree as follows:

                                    ARTICLE I
                                   DEFINITIONS

         As used in this Agreement, the following terms shall have the
respective meanings set forth below:

         "Accredited Investor" has the meaning set forth in Section 8.1 below.
<PAGE>   2
         "Affiliate" has the meaning set forth in Rule 12b-2 of the regulations
promulgated under the Securities Exchange Act of 1934, as amended.

         "Agreement" means this Agreement, as amended from time to time.

         "American Spectrum" has the meaning set forth in the Preface above.

         "American Spectrum Common Shares" shall mean the shares of common
stock, $.01 par value, of American Spectrum.

         "Articles of Incorporation" means the articles of incorporation of
American Spectrum.

         "Business Combination" has the meaning set forth in Section 3.1 below.

         "Bylaws" means the bylaws of American Spectrum.

         "Closing" has the meaning set forth in Section 2.2 below.

         "Closing Date" has the meaning set forth in Section 2.2 below.

         "Code" means the Internal Revenue Code of 1986, as amended.

         "Company" has the meaning set forth in the Preface above.

         "Contribution" has the meaning set forth in the Preface above.

         "Contributor" has the meaning set forth in the Preface above.

         "Exchange Agent" has the meaning set forth in Section 3.3 below.

         "Management Company" has the meaning as set forth in the second
"Whereas" clause.

         "Material Adverse Effect" means, as to any Party, a material adverse
effect on the business, properties, operations or condition (financial or
otherwise) which is not related to any industry-wide change in the economy or
market or other conditions affecting all businesses in the industry of the Party
to which the term is applied.

         "Operating Partnership" means American Spectrum Realty Operating
Partnership, L.P., a Delaware limited partnership.

         "Party" or "Parties" has the meaning set forth in the Preface above.

         "Person" means an individual, a partnership, a corporation, an
association, a joint stock company, a trust, a joint venture, a limited
liability company, an unincorporated organization, a governmental entity (or any
department, agency, or political subdivision thereof) or other entity.

                                       2
<PAGE>   3
         "Prospectus/Consent Solicitation Statement" has the meaning set forth
in the first paragraph of the Recitals above.

         "Registration Statement" has the meaning set forth in the first
paragraph of the Recitals above.

         "SEC" has the meaning set forth in the first paragraph of the Recitals
above.

         "Securities Act" has the meaning set forth in the first paragraph of
the Recitals above.

         "Share Consideration" has the meaning set forth in Section 3.1.

         "Shares" has the meaning set forth in Section 2.1.

         "Stockholders" means stockholders of the Contributor.

         "Tax" means any federal, state, local, or foreign income, gross
receipts, license, payroll, employment, excise, severance, stamp occupation,
premium, windfall profits, environmental (including taxes under Code (S) 59A),
customs duties, capital stock, franchise, profits, withholding, social security
(or similar), unemployment, disability, real property, personal property, sales,
use, transfer, registration, value added, alternative or add-on minimum,
estimated, or other tax of any kind whatsoever, including any interest, penalty,
or addition thereto, whether disputed or not.

                                   ARTICLE II
                            CONTRIBUTION OF PROPERTY

         2.1 Contribution and Assignment. Subject to the terms and conditions
hereinafter specified, Contributor agrees to contribute to American Spectrum or
the Operating Partnership and American Spectrum or the Operating Partnership
agrees to acquire from Contributor, as a result of this contribution to capital,
all of Contributor's right, title and interest in and to all of the then
outstanding capital stock of the Management Company (the "Shares").

         2.2 (a) The Closing. The closing of the transactions contemplated by
this Agreement (the "Closing") shall take place at the offices of Proskauer Rose
LLP, 1585 Broadway, New York, New York simultaneously with the Closing of the
Consolidation pursuant to the Prospectus/Consent Solicitation Statement (the
"Closing Date"), but in no event later than December 31, 2001, unless extended
by the mutual agreement of the Parties.

                  (b) At the Closing, Contributor shall deliver to the Company
stock certificates representing all of the Shares (the "Certificates"),
accompanied by stock powers duly endorsed in blank for transfer.

                                       3
<PAGE>   4
                                   ARTICLE III
                                  CONSIDERATION

         3.1 Share or Operating Partnership Unit Consideration. (a) At the
Closing, the Stockholders will be issued American Spectrum Common Shares (the
"Share Consideration") in such amounts as shall be determined in accordance with
the final Prospectus/Consent Solicitation Statement. The Contributor
acknowledges that the amounts and terms may be different from that set forth in
the draft Prospectus/Consent Solicitation Statement.

                  (b) Prior to the Closing, if American Spectrum splits or
combines American Spectrum Common Shares; or pays a stock dividend or other
stock distribution in American Spectrum Common Shares, or in rights or
securities exchangeable or convertible into or exercisable for American Spectrum
Common Shares, or otherwise changes the American Spectrum Common Shares into, or
exchanges the American Spectrum Common Shares for, any other securities (whether
pursuant to or as part of a merger, consolidation, acquisition of property or
stock, separation, reorganization, or liquidation of American Spectrum as a
result of which American Spectrum stockholders receive cash, stock, or other
property in exchange for, or in connection with, their American Spectrum Common
Shares (a "Business Combination") or otherwise)), then the American Spectrum
Common Shares to be received by the Contributor will be appropriately adjusted
to reflect such event.

         3.2 Fractional American Spectrum Common Shares. No certificates
representing fractional American Spectrum Common Shares or fractional Operating
Partnership Units shall be issued. Each Stockholder who would otherwise be
entitled to a fractional American Spectrum Common Shares or fractional Operating
Partnership Units will receive one American Spectrum Common Share or Operating
Partnership Unit for each fractional interest representing 50% or more of one
American Spectrum Common Share or Operating Partnership Unit. No American
Spectrum Common Shares or Operating Partnership Unit will be issued for a
fractional interest representing less than 50% of an American Spectrum Common
Share or Operating Partnership Unit.

         3.3 Issuance of Shares and Operating Partnership Units. American
Spectrum shall designate an exchange agent (the "Exchange Agent") to act as such
in connection with the issuance of certificates representing the American
Spectrum Common Shares pursuant to this Agreement.

                                   ARTICLE IV
               REPRESENTATIONS AND WARRANTIES OF AMERICAN SPECTRUM
                          AND THE OPERATING PARTNERSHIP

         American Spectrum represents and warrants to the Stockholders and the
Contributor that the statements contained in this Article IV are correct and
complete as of the date hereof:

         4.1 Organization, Qualification and Corporate Power. American Spectrum
is a corporation duly organized, validly existing, and in good standing under
the laws of Maryland, as

                                       4
<PAGE>   5
set forth in the Preface. American Spectrum is duly authorized to conduct
business and is in good standing under the laws of each jurisdiction where such
qualification is required, except where failure to so qualify or obtain
authorization would not have a Material Adverse Effect on American Spectrum. The
Operating Partnership is a limited partnership duly organized, validly existing
and in good standing under the laws of Delaware, as set forth in the Preface.
The Operating Partnership is duly authorized to conduct business and is in good
standing under the laws of each jurisdiction where such qualification is
required, except where failure to so qualify or obtain authorization would not
have a Material Adverse Effect on the Operating Partnership.

         4.2 Authorization for Common Stock. The Share Consideration and the
Operating Partnership Units will, when issued, be duly authorized, validly
issued, fully paid and nonassessable, and no stockholder or partner of American
Spectrum will have any preemptive right or similar rights of subscription or
purchase in respect thereof.

         4.3 Authorization of Transaction. American Spectrum and the Operating
Partnership have full power and authority (including full corporate and limited
partnership power and authority) to execute and deliver this Agreement and to
perform their obligations hereunder. The execution, delivery and performance by
American Spectrum and the Operating Partnership of this Agreement has been duly
and validly authorized by the board of directors of American Spectrum. This
Agreement constitutes the valid and legally binding obligation of American
Spectrum or the Operating Partnership, enforceable in accordance with its terms
and conditions. Neither American Spectrum nor the Operating Partnership is
required to give any notice to, make any filing with, or obtain any
authorization, consent, or approval of any government or governmental agency in
order to consummate the transactions contemplated by this Agreement, except in
connection with the federal securities laws, the Hart Scott Rodino Act, if
applicable, and any applicable "Blue Sky" or state securities laws.

                                    ARTICLE V
                    REPRESENTATIONS AND WARRANTIES CONCERNING
                                 THE CONTRIBUTOR

         The Contributor represents and warrants to American Spectrum that the
statements contained in this Article V are correct and complete as of the date
hereof.

         5.1 Organization, Qualification and Corporate Power. The Contributor
and the Management Company are duly authorized to conduct business and is in
good standing under the laws of each jurisdiction where such qualification is
required, except where failure to so qualify or obtain authorization would not
have a Material Adverse Effect on the Contributor.

         5.2 Authorization of Transaction. The Contributor has full power and
authority to execute and deliver this Agreement and to perform its obligations
hereunder. This Agreement constitutes the valid and legally binding obligation
of the Contributor, enforceable in accordance with its terms and conditions. The
Contributor is not required to give any notice to, make any filing with, or
obtain any authorization, consent or approval of any governmental agency in
order to consummate the transactions contemplated by this Agreement, except in
connection with

                                       5
<PAGE>   6
federal securities laws, the Hart Scott Rodino Act, if applicable, and any
applicable "Blue Sky" or state securities laws.

         5.3 Investment Representation.

         (a) Each of the Stockholders of the Contributor, by reason of its
business and financial experience.

                  (i) has such knowledge, sophistication and experience in
financial and business matters and in making investment decisions of this type
that it is capable of evaluating the merits and risks of and of making an
informed investment decision with respect to an investment in American Spectrum
Common Shares,

                  (ii) is capable of protecting its own interest, and

                  (iii) is capable of bearing the economic risk of such
investment.

         (b) Each of the Stockholders of the Contributor is an "accredited
investor" as defined in Rule 501 of the regulations promulgated under the
Securities Act of 1933.

         (c) (i) Each of the Stockholders of the Contributor understands that an
investment in American Spectrum involves substantial risks.

                  (ii) Each of the Stockholders of the Contributor has been
given the opportunity to make a thorough investigation of the proposed
activities of American Spectrum and the Operating Partnership.

                  (iii) Each of the Stockholders of the Contributor has had an
opportunity to ask questions of and receive answers from representatives of
American Spectrum concerning American Spectrum and their proposed activities and
the terms and conditions of an investment in American Spectrum Common Shares.

         (d) The American Spectrum Common Shares to be issued to the
Stockholders of the Contributor at the Closing will be acquired by each
Stockholder for its own account for investment only and not with a view to, or
with any intention of, a distribution or resale thereof, in whole or in part, or
the grant of any participation therein.

         (e) The Contributor acknowledges that

                           (A) the American Spectrum Shares to be issued at the
Closing have not been registered under the Securities Act of 1933 or state
securities laws by reason of a specific exemption or exemptions from
registration under the Securities Act of 1933 and applicable state securities
laws and, if such American Spectrum Common Shares are represented by
certificate, such certificates will bear a legend to such effect,

                                       6
<PAGE>   7
                           (B) American Spectrum's reliance on such exemptions
is predicated in part on the accuracy and completeness of the representations
and warranties contained herein,

                           (C) the American Spectrum Common Shares to be issued
at the Closing may not be resold or otherwise distributed unless registered
under the Securities Act of 1933 and applicable state securities laws, or unless
an exemption from registration is available,

                           (D) there is no public market for such American
Spectrum Common Shares, and

                           (E) American Spectrum does not have any obligations
or intention to register such American Spectrum Common Shares under the
Securities Act of 1933 or any state securities laws or to take any action that
would make available any exemption from the registration requirements of such
laws, except as provided in the Registration Rights Agreement (referred to
below).

                           (F) The Contributor hereby acknowledges that because
of the restrictions on the transfer or assignment, each Stockholder may have to
bear the economic risk of the investment commitment evidenced by this Agreement
and any of the American Spectrum Common Shares issued hereunder for an
indefinite period of time.

                                   ARTICLE VI
                              PRE-CLOSING COVENANTS

         The Parties agree as follows with respect to the period between the
execution of this Agreement and the Closing:

         6.1 General. Each of the Parties will use its reasonable best efforts
to take all action and to do all things necessary, proper or advisable in order
to consummate and make effective the transactions contemplated by this Agreement
(including satisfaction, but not waiver, of the closing conditions set forth in
Article VII below).

         6.2 Notices and Consents. Each of the Parties shall give any notices
to, make any filings with, and use its reasonable best efforts to obtain any
authorizations, consents, and approvals of governments and governmental agencies
in connection with the matters referred to in Sections 8.1 below.

         6.3 Execution of Instruments. The Contributor shall execute all
instruments necessary to effect the transfer and the Instruments set forth in
Section 8.1(g) to (i).

         6.4 American Spectrum shall execute the documents to be executed by it
pursuant to Section 8.1(g) and (h) below.

                                       7
<PAGE>   8
                                   ARTICLE VII
                             POST-CLOSING COVENANTS

         The Parties agree as follows with respect to the period following the
Closing:

         7.1 General. In the event that at any time after the Closing any
further action is necessary or desirable to carry out the purposes of this
Agreement, each of the Parties will take such further action (including the
execution and delivery of such further instruments and documents) as any other
Party reasonably may request, all at the sole cost and expense of the requesting
Party. The Contributor acknowledges and agrees that from and after the Closing,
American Spectrum or the Operating Partnership will be entitled to possession of
all documents, books, records (including Tax records), agreements and financial
data of any sort relating to the Contributor but will provide the Contributor
with reasonable access to such documents, books and records upon request.

         7.2 Litigation Support. In the event and for so long as any Party
actively is contesting or defending against any action, suit, proceeding,
hearing, investigation, charge, complaint, claim, or demand in connection with
(i) any transaction contemplated under this Agreement or (ii) any fact,
situation, circumstance, status, condition, activity, practice, plan,
occurrence, event, incident, action, failure to act, or transaction on or prior
to the Closing Date involving the Contributor, the other Party will cooperate
with him and his counsel in the contest or defense, make available their
personnel, and provide such testimony and access to their books and records as
shall be necessary in connection with the contest or defense, all at the sole
cost and expense of the contesting or defending Party.

         7.3 Share Registration. American Spectrum shall use commercially
reasonable efforts to register the American Spectrum Common Shares promptly
following the first anniversary of the consummation of the Merger.

                                  ARTICLE VIII
                        CONDITIONS TO OBLIGATION TO CLOSE

         8.1 Conditions to Each Party's Obligation. The respective obligations
of American Spectrum or the Operating Partnership, the Stockholders and the
Contributor to consummate the transactions contemplated by this Agreement are
subject to the fulfillment at or prior to the Closing Date of each of the
following conditions, which conditions may be waived upon the written consent of
American Spectrum or the Operating Partnership and the Stockholders:

         (a) Consents. The Parties shall have obtained all consents of third
parties required in connection with the consummation of the transaction
contemplated hereby.

         (b) Governmental Approvals. The Parties shall have received all other
authorizations, consents, and approvals of governments and governmental agencies
required in connection with the consummation of the transaction contemplated
hereby.

                                       8
<PAGE>   9
         (c) No Injunction or Proceedings. There shall not be an unfavorable
injunction, judgment, order, decree, ruling, or charge would, in the reasonable
judgment of American Spectrum, prevent consummation of any of the transactions
contemplated by this Agreement.

         (d) No Suspension of Trading, Etc. At the Closing, there shall be no
declaration of a banking moratorium by federal or state authorities or any
suspension of payments by banks in the United States (whether mandatory or not)
or of the extension of credit by lending institutions in the United States, or
commencement of war or other international, armed hostility or national calamity
directly or indirectly involving the United States, which war, hostility or
calamity (or any material acceleration or worsening thereof), in the sole
judgment of American Spectrum, would have a Material Adverse Effect on the
Contributor or, in the sole judgment of the Stockholders, would have a Material
Adverse Effect on American Spectrum.

         (e) The Consolidation pursuant to the Prospectus/Consent Solicitation
Statement shall have closed or be closing simultaneously with the Closing.

         (f) American Spectrum Common Shares shall have been approved for
listing on notice of issuance on a national securities exchange acceptable to
American Spectrum.

         (g) Registration Rights Agreement. A registration rights agreement or
customary terms, pursuant to which American Spectrum agrees to use commercially
reasonable efforts to register the American Spectrum Common Shares issued or
issuable in exchange for Operating Partnership Units shall have been executed
and delivered hereto.

         (h) Exchange Rights Agreement. An exchange rights agreement on
customary terms shall have been entered into by the parties hereto, which shall
permit exchange of the Operating Partnership Units for American Spectrum Common
Shares subject to customary limitations on and after the first anniversary of
the Closing, shall have been executed and delivered.

         (i) Investment Representation Letter. Each of the Stockholders of the
Contributor shall execute a customary investment representation letter with
respect to the matters set forth in Section 5.3.

         (j) Transfer Tax Returns. The Parties shall deliver any required
transfer tax returns.

         (k) "Non-Foreign Person Affidavit". The Parties shall deliver a
"non-foreign person affidavit" as required by Internal Revenue Code Section
1445, substantially in the form attached hereto as Exhibit I.

         8.2 Conditions to Obligation of the Contributor. The obligations of the
Contributor to consummate the transactions contemplated hereby and take the
actions to be performed by it in connection with the Closing are subject to
satisfaction of the following additional conditions:

         American Spectrum shall have delivered to the Stockholders the Share
Consideration pursuant to Section 3.1.

                                       9
<PAGE>   10
                                   ARTICLE IX
                                   TERMINATION

         9.1 Termination by Mutual Consent. This Agreement may be terminated and
the Merger may be abandoned, before or after the approval of the Stockholders of
the Contributor or American Spectrum or the Operating Partnership, respectively,
either by the mutual written consent of American Spectrum or the Operating
Partnership and the Contributor or by the mutual action of the board of
directors of American Spectrum or the general partner of the Operating
Partnership, and the Managing General Partner or Managing Member of the
Contributor.

         9.2 Termination by Either American Spectrum or the Operating
Partnership or by the Contributor. This Agreement may be terminated and the
Contribution may be abandoned (a) by action of American Spectrum or the
Operating Partnership in the event of a failure of a condition to the
obligations of American Spectrum and the Operating Partnership set forth in
Section 7.1 of this Agreement; (b) by the Managing General Partner or the vote
of a majority in interest of the Stockholders of the Contributor in the event of
a failure of a condition to the obligations of the Contributor set forth in
Section 7.1 or 7.2 of this Agreement; or (c) if a United States or federal or
state court of competent jurisdiction or United States federal or state
governmental agency shall have issued an order, decree or ruling or taken any
other action permanently restraining, enjoining or otherwise prohibiting the
transactions contemplated by this Agreement and such order, decree, ruling or
other action shall have become final and non-appealable; provided, in the case
of a termination pursuant to clause (a) or (b) above, that the terminating party
shall not have breached in any material respect its obligations under this
Agreement in any manner that shall have proximately contributed to the
occurrence of the failure referred to in said clause.

         9.3 Effect of Termination and Abandonment. In the event of termination
of this Agreement and abandonment of the Contribution pursuant to this Article
IX, no Party hereto (or any of its directors, officers, Managing General
Partners, Managing Members, Limited Stockholders) shall have any liability or
further obligation to any other Party to this Agreement, except that nothing
herein will relieve any Party from liability for any breach of this Agreement.

                                    ARTICLE X
                                  MISCELLANEOUS

         10.1 No Third-Party Beneficiaries. This Agreement shall not confer any
rights or remedies upon any Person other than the Parties and their respective
successors and permitted assigns.

         10.2 Entire Agreement. This Agreement (including the documents referred
to herein) constitutes the entire agreement among the Parties and supersedes any
prior understandings, agreements, or representations by or among the Parties,
written or oral, to the extent they related in any way to the subject matter
hereof.

         10.3 Succession and Assignment. This Agreement shall be binding upon
and inure to the benefit of the Parties named herein and their respective
successors and permitted assigns. No

                                       10
<PAGE>   11
Party may assign either this Agreement or any of its rights, interests, or
obligations hereunder without the prior written approval of American Spectrum or
the Operating Partnership and the Stockholders; provided, however, that American
Spectrum or the Operating Partnership may (i) assign any or all of its rights
and interests hereunder to one or more of its Affiliates and (ii) designate one
or more of its Affiliates to perform its obligations hereunder (in any or all of
which cases American Spectrum or the Operating Partnership nonetheless shall
remain responsible for the performance of all of its obligations hereunder).

         10.4 Counterparts. This Agreement may be executed in one or more
counterparts, each of which shall be deemed an original but all of which
together will constitute one and the same instrument.

         10.5 Headings. The section headings contained in this Agreement are
inserted for convenience only and shall not affect in any way the meaning or
interpretation of this Agreement.

         10.6 Notices. All notices, requests, demands, claim, or other
communication hereunder shall be deemed duly given, as of the date two business
days after mailing, if it is sent by registered or certified mail, return
receipt requested, postage prepaid, and addressed to the intended recipient as
set forth below:

         If to the Contributor:

     c/o William J. Carden
         Chief Executive Officer
         American Spectrum Realty, Inc.
         1800 East Deere Avenue
         Santa Ana, California  92705

         With copy to:

         Proskauer Rose LLP
         1585 Broadway
         New York, NY  10036
         Attn:  Peter M. Fass, Esq.
         Telecopy:  (212) 969-2900

         If to American Spectrum:

         William J. Carden
         Chief Executive Officer
         American Spectrum Realty, Inc.
         1800 East Deere Avenue
         Santa Ana, California  92705

                                       11
<PAGE>   12
         With copy to:

         Proskauer Rose LLP
         1585 Broadway
         New York, NY  10036
         Attn:  Peter M. Fass, Esq.
         Telecopy:  (212) 969-2900

Any Party may send any notice, request, demand, claim or other communication
hereunder to the intended recipient at the address set forth above using any
other means (including personal delivery, expedited courier, messenger service,
telecopy, telex, ordinary mail, or electronic mail), but no such notice,
request, demand, claim, or other communication shall be deemed to have been duly
given unless and until it actually is received by the intended recipient. Any
Party may change the address to which notices, requests, demands, claims, and
other communications hereunder are to be delivered by giving the other Party
notice in the manner herein set forth.

         10.7 Governing Law. This Agreement shall be governed and construed in
accordance with the laws of the State of Maryland without giving effect to any
choice or conflict of law provision or rules (whether of the State of Maryland
or any other jurisdiction) that would cause the application of the laws of any
jurisdiction other than the State of Maryland.

         10.8 Amendments and Waivers. No amendment of any provision of this
Agreement shall be valid unless the same shall be in writing and signed by
American Spectrum and the Contributor. No waiver by any party of any default,
misrepresentation, or breach of warranty or covenant hereunder, whether
intentional or not, shall be deemed to extend to any prior or subsequent
default, misrepresentation, or breach of warranty or covenant hereunder or
affect in any way any rights arising by virtue of any prior or subsequent such
occurrence.

         10.9 Severability. Any term or provision of this Agreement that is
invalid or unenforceable in any situation in any jurisdiction shall not affect
the validity or enforceability of the remaining terms and provisions hereof or
the validity or enforceability of the offending term or provision in any other
situation or in any other jurisdiction.

         10.10 Expenses. Each of the Parties will bear its own costs and
expenses (including legal fees and expenses) incurred in connection with this
Agreement and the transactions contemplated hereby, except to the extent set
forth in the Prospectus/Consent Solicitation Statement.

         10.11 Construction. The Parties have participated jointly in the
negotiation and drafting of this Agreement. In the event an ambiguity or
question of intent or interpretation arises, this Agreement shall be construed
as if drafted jointly by the Parties and no presumption or burden of proof shall
arise favoring or disfavoring any Party by virtue of the authorship of any of
the provisions of this Agreement. Any reference to any federal, state, local or
foreign statute or law shall be deemed also to refer to all rules and
regulations promulgated thereunder, unless the

                                       12
<PAGE>   13
context requires otherwise. The word "including" shall mean including without
limitation. The Parties intend that each representation, warrant, and covenant
contained herein in any respect, the fact that there exists another
representation, warranty, or covenant contained herein in any respect, the fact
that there exists another representation, warranty, or covenant relating to the
same subject matter (regardless of the relative levels of specificity) which the
Party has not breached shall not detract from or mitigate the fact that the
Party is in breach of the first representation, warranty or covenant.

         10.12 Specific Performance. Each of the Parties acknowledges that the
other Party would be damaged irreparably in the event any of the provisions of
this Agreement are not performed in accordance with their specific terms or
otherwise are breached. Accordingly, each of the Parties agrees that the other
Party shall be entitled to an injunction or injunctions to prevent breaches of
the provisions of this Agreement and to enforce specifically this Agreement and
the terms and provisions hereof in any action instituted in any court of the
United States or any state thereof having jurisdiction over the Parties and the
matter (subject to the provisions set forth in Section 10.13 below), in addition
to any other remedy to which they may be entitled, at law or in equity.

         10.13 Submission to Jurisdiction. Each of the Parties submits to the
jurisdiction of any state or federal court sitting in the State of California,
in any action or proceeding arising out of or relating to this Agreement and
agrees that all claims in respect of the action or proceeding may be heard and
determined in any such court.

         10.14 Further Assurances; Further Actions. Each of the parties shall,
without further consideration, take such action and execute and deliver such
documents as may be necessary to carry out this agreement.

                   REMAINDER OF PAGE INTENTIONALLY LEFT BLANK

                                       13
<PAGE>   14
         IN WITNESS WHEREOF, the Parties have executed this Agreement as of the
date first above written.

                                    AMERICAN SPECTRUM REALTY, INC.

                                    By: ________________________________________
                                        Name
                                        Title

                                    AMERICAN SPECTRUM REAL ESTATE SERVICES, INC.

                                    By: ________________________________________
                                        Name
                                        Title

                                       14

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