Exhibit
      10.26









AMENDMENT
      NO. 3 TO REVOLVING CREDIT AGREEMENT




This
      Amendment No. 3 (this "Amendment No. 3") to Revolving Credit Agreement
      is made and entered into and has an effective date as of the 26 th day ****** of
      March, 2007,
      by
      and among HARTMAN REIT OPERATING PARTNERSHIP, L.P. ("Hartman OP"),
      HARTMAN REIT OPERATING PARTNERSHIP III, L.P. ("Hartman Ill") and the Subsidiaries
      of Hartman OP and/or Hartman III which are listed on Schedule 1 (as such
      Schedule 1 may be amended from time to time) (Hartman OP, Hartman III and any
      such Subsidiary
      being hereinafter referred to collectively as the "Borrower" unless referred
      to in
      their
      individual capacities) to a certain Revolving Credit Agreement (as amended,
      the "Credit
      Agreement") dated as of March 11, 2005, each having its principal place of business
      at 1450 West Sam Houston Parkway North, Suite 100, Houston, Texas 77043, KEYBANK
      NATIONAL ASSOCIATION ("KeyBank"), having a principal place of business
      at 127 Public Square, Cleveland, Ohio 44114, and certain other lenders individually
      and in certain agent capacities (collectively with KeyBank, the "Lenders") and
      KeyBank, as administrative agent for itself and each other Lender (the
      "Agent").




WHEREAS,
      the Borrower has requested certain amendments to the Credit Agreement,
      as set forth herein,




NOW,
      THEREFORE, in consideration of One Dollar ($1.00) and other good and valuable
      consideration by each of the parties hereto, the receipt and sufficiency of
      which are
      hereby acknowledged, it is agreed as follows:




1.
            Capitalized
                terms used but not defined herein shall have the respectivemeanings
                assigned to such terms in the Credit
                Agreement.




2.
            From
                and after the effective date
                hereof:




(a)
            The
                term Loan Documents shall include this Amendment No. 3 toCredit
                Agreement, dated as of March 26, 2007, among theBorrower,
                the Lenders and the Agent.




(h) Section
      1.1 of the Credit Agreement is amended by inserting, in the appropriate
      alphabetical order, the following new definition:




"Excluded
      Litigation Fees". The
      legal
      fees and disbursements paid by
      the
      Borrower during the applicable period in connection with litigation among Allen
      R. Hartman, Hartman Management L.P. and the
      Trust, Provided that
      "Excluded Litigation Fees" shall not include
      any legal fees and disbursements incurred by the Borrower in
      defending any litigation commenced by the Trust's shareholders (including,
      without limitation, Allen R. Hartman) in their capacity


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as
      such
      (other than in connection with litigation commenced by and/or involving solely
      Allen R. Hartman (and not by and/or involving
      any other shareholder(s)) in his capacity as a shareholder)."




(c) Section
      9.6 of the Credit Agreement is amended by inserting, at the end
      thereof, the following new clause (c):




"(c)
      Notwithstanding the definition of "funds from operations" by
      the
      Board of Governors of the National Association of Real Estate
      Investment Trusts, for any fiscal period ending on or after December
      31, 2006 through December 31, 2007, the Excluded Litigation Fees shall not
      reduce "funds from operations" for purposes
      of determining the Distributions permitted to be declared under
      Section 9.6(a)(i)."




(d) Section
      14.1(n) of the Credit Agreement is amended to read in its entirety
      as follows:




"(n)
      the
      failure of James C. Mastandrea, for any reason, to cease to
      retain
      the title of Chief Executive Officer of the Trust and to perform
      the functions typically performed under such office and to be
      actively involved in strategic planning and decision-making for the
      Trust, unless within **six** (6)
      months after such failure, the Board of
      Directors or Board of Trustees has duly elected or appointed a qualified
      substitute to replace such individual who is acceptable to the
      Agent
      in its sole discretion (as notified to the Borrower by the Agent
      in
      writing); or the occurrence of any transaction in which any
      "person" or "group" (within the meaning of Section 13(d) and 14(d)(2)
      of the Securities Exchange Act of 1934) becomes the "beneficial owner" (as
      defined in Rule 13d-3 under the Securities Exchange
      Act of 1934), directly or indirectly, of a sufficient number
      of
      voting rights applicable to the Trust ordinarily entitled to
      vote
      in the election of directors or trustees, empowering such "person"
      or "group" to elect a majority of the Board of Directors or Board
      of
      Trustees of the Trust, who did not have such power before
      such transaction; or during any twelve-month period on or after
      the
      Closing Date, individuals who at the beginning of such period
      constituted the Board of Trustees of the Trust (together with any
      new
      Trustees whose election by the Board of Trustees or whose
      nomination for election by the shareholders of the Trust was approved
      by a vote
      of
      at least a majority of the members of the Board of Trustees then in office
      who
      either were members of the Board
      of
      Trustees at the beginning of such period or whose election
      or nomination for election was previously so approved)


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ceased
      for any reason to constitute a majority of the members of the
      Board of Trustees of the Trust then in office; or"




(e) Clauses
      (iii) and (iv) of Section 14.1(o) of the Credit Agreement are
      deleted and are replaced with the following:




"or
      (iii) Hartman OP or the Trust shall at any time fail to be
      self-managed;"




3.
            The
                Borrower hereby represents, warrants and certifies that set forth
                onAnnex
                1 attached hereto is a true and complete listing of the duly electedofficers
                of the Borrower and the Trust, and set forth opposite each officer'sname
                is his or her genuine signature.






4.
            The
                Borrower hereby represents and warrants as
                follows:




(a)  Representations
      in Credit Agreement. Both
      before and after giving effect
      to this Amendment No. 3, each of the representations and warranties made
      by or on behalf of the Borrower, the Trust or any of their respective
      Subsidiaries contained in the Credit Agreement or any of the other Loan Documents,
      was true when made and is true on and as of the date hereof with
      the same full force and effect as if each of such representations and warranties
      had been made on the date hereof and in this Amendment No. 3,
      except to the extent that such representations and warranties relate expressly
      to an earlier date.




(b)  No
      Events of Default. No
      Default or Event of Default **exists** on
      the date
      hereof (both before and after giving effect to this Amendment No.
      3).




(c) Binding
      Effect of Documents, This
      Amendment No. 3 has been duly executed
      and delivered by the Borrower and the Trust and is in full force and
      effect as of the date hereof, and the agreements and obligations of the Borrower
      contained herein constitute legal, valid and binding obligations of
      the Borrower enforceable against the Borrower in accordance with their
      respective terms.




5.
            Provisions
                of General Annlication.




(a)
      No Other Changes. Except as otherwise expressly provided by this Amendment
      No, 3, all of the terms, conditions and provisions of the Credit
      Agreement and each of the other Loan Documents remain unaltered.
      The Credit Agreement and this Amendment No. 3 shall be read and
      construed as one agreement.


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(b)  Governing
      Law, This
      Amendment No. 3 is intended to take effect as a sealed
      instrument and shall be deemed to be a contract under the laws of the
      State of Ohio. This Amendment No. 3 and the rights and obligations of
      each of the parties hereto shall be governed by and interpreted and determined
      in accordance with the laws of the State of Ohio.




(c)  Binding
      Effect: Assignment. This
      Amendment No, 3 shall be binding upon
      and inure to the benefit of each of the parties hereto and their respective
      successors in title and assigns,




(d)  Counterparts. This
      Amendment No. 3 may be executed in any number of
      counterparts, but all such counterparts shall together constitute but one and
      the same agreement. In making proof of this Amendment No, 3, it shall
      not be necessary to produce or account for more than one counterpart thereof
      signed by each of the parties hereto.




(e)  Conflict
      with Other Agreements. If
      any of the terms of this Amendment
      No. 3 shall conflict in any respect with any of the terms of any of the Credit
      Agreement or any other Loan Document, the terms of this
      Amendment No. 3 shall be controlling.




(f) Condition
      Precedent. The
      effectiveness of this Amendment No. 3 is subject
      to the condition precedent that the Agent shall have received, in form
      and substance satisfactory to it, an executed original of this Amendment
      No. 3 from each Borrower and from the Majority Lenders.




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