Document:

<PAGE>

                                 EXHIBIT 10.56

                   FIRST AMENDMENT TO REVOLVING LOAN AGREEMENT
                           AND OTHER LOAN DOCUMENTS
   RELATING TO THE SOUTHTRUST BANK N.A. $32,393,000 REVOLVING LINE OF CREDIT
<PAGE>

                  FIRST AMENDMENT TO REVOLVING LOAN AGREEMENT
                           AND OTHER LOAN DOCUMENTS

     THIS FIRST AMENDMENT TO REVOLVING LOAN AGREEMENT AND OTHER LOAN DOCUMENTS
(this "Amendment") is entered into as of the 15/th/ day of December, 2000, by
and between WELLS OPERATING PARTNERSHIP, L.P., a Delaware limited partnership
(hereinafter referred to as "Borrower"), WELLS REAL ESTATE INVESTMENT TRUST,
INC., a Maryland corporation ("Guarantor"), and SOUTHTRUST BANK, an Alabama
banking corporation (as successor by conversion to SouthTrust Bank, National
Association, a national banking association) (hereinafter referred to as
"Lender").

                               R e c i t a l s:

     Borrower and Lender have entered into a Revolving Loan Agreement dated as
of May 3, 2000 (the "Loan Agreement"), pursuant to which Lender agreed to make a
revolving loan to Borrower in the principal amount of $35,000,000.00 (the
"Loan"). The Loan is evidenced by a Revolving Note dated as of May 3, 2000,
payable by Borrower to the order of Lender in the principal amount of the Loan
(the "Note") and is guaranteed by Guarantor pursuant to a Guaranty Agreement
dated as of May 3, 2000, executed by Guarantor for the benefit of Lender (the
"Guaranty").

     Lender and Borrower, with the consent of Guarantor, have agreed to make
certain modifications to the Loan Agreement and the other Loan Documents.
Borrower, Guarantor, and Lender have entered into this Amendment for the purpose
of evidencing the modification of the Loan in accordance with their agreement.

     NOW, THEREFORE, in consideration of Ten Dollars ($10.00) and other good and
valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, Borrower and Lender agree as follows:

     1.   Definitions.  Capitalized terms used, but not defined, in this
Amendment shall have the meanings ascribed to them in the Loan Agreement.

     2.   Amendments to Loan Documents.  The Loan Documents are hereby amended
and modified in the following respects:

          (a)  The "Maximum Loan Amount", as defined in Article One of the Loan
     Agreement, is hereby amended and reduced to the principal sum of
     $32,393,000.00.

          (b)  The definition of the term "Officer's Certificate" appearing on
     page seven (7) of the Loan Agreement is hereby deleted in its entirety and
     the following is inserted in lieu thereof:

          ""Officer's Certificate" means certificate in the form of Exhibit B
          attached hereto executed by the chief executive officer or executive
          vice president of the Person on whose behalf such certificate is being
          executed (or, if applicable, the chief executive officer of the
          general partner or manager of such Person)."

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             First Amendment to Loan Agreement and Other Loan Documents - Page 1
                              Wells Operating Partnership, L.P. - Revolving Loan
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          (c)  The definition of the term "Senior Management" appearing on page
     eight (8) of the Loan Agreement is hereby deleted in its entirety and the
     following is inserted in lieu thereof:

          ""Senior Management" means (i) the Chief Executive Officer, Chairman
          of the Board, President, and Chief Operating Officer of Borrower or
          Guarantor, and (ii) any other Persons with responsibility for any of
          the functions typically performed in a corporation by the officers
          described in clause (i)."

          (d)  Section 5.1.5(c) of the Loan Agreement is hereby deleted in its
     entirety and the following is inserted in lieu thereof:

          "(c)  Quarterly Project Statements. As soon as available, and in any
                ----------------------------
          event within forty-five (45) days after the first three fiscal
          quarters of each fiscal year, an Operating Statement and Rent Roll for
          the Project accompanied by a certificate of the Chief Financial
          Officer of Wells REIT to the effect that each such Operating Statement
          and Rent Roll fairly, accurately, and completely present the
          operations and leasing status of the Project for, or as of the end of,
          the period indicated (provided that no Rent Roll shall be required for
          the Project which is leased entirely under a single Lease)."

          (e)  Section 6.2 of the Loan Agreement is hereby deleted in its
     entirety and the following is inserted in lieu thereof:

               "6.2  Transactions Included. A Transfer within the meaning of
                     ---------------------
          Section 6.1 shall be deemed to include, without limitation, (i) an
          installment sales agreement wherein Borrower agrees to sell the
          Collateral or any part thereof for a price to be paid in installments;
          (ii) an agreement by Borrower leasing all or a substantial part of the
          Project for other than actual occupancy by a space lessee thereunder
          or a sale, assignment or other transfer of, or the grant of a security
          interest in, Borrower's right, title and interest in and to the Leases
          or any rents therefrom; (iii) any divestiture of Borrower's title to
          the Collateral or any interest therein in any manner or way, whether
          voluntary or involuntary, or any merger, consolidation, dissolution or
          syndication affecting Borrower; (iv) if Borrower or any general
          partner of Borrower is a corporation, the voluntary or involuntary
          sale, conveyance, or transfer of any of such corporation's stock or
          the creation or issuance of new stock in one or a series of
          transactions by which an aggregate of more than ten percent (10%) of
          such corporation's stock shall be vested in an Acquiring Person who is
          not now a stockholder of such corporation or any change in the control
          of such corporation directly or indirectly; (v) if Borrower or any
          general partner of Borrower is a limited or general partnership, joint
          venture, or limited liability company, the change, removal,
          resignation, or addition of a general partner, managing partner,
          limited partner, joint venturer, manager, or member, or the transfer
          of any partnership interest of any general partner, managing partner,
          or limited partner, or the transfer of any interest of any joint
          venturer or member (or the transfer of any interest of any Person
          directly or indirectly controlling such partner, joint venturer, or
          member by operation of law or otherwise) to an Acquiring Person; and
          (vi) if Borrower or any

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          general partner of Borrower is a business trust, the change, removal,
          resignation, or addition of a trustee, or the voluntary or involuntary
          sale, conveyance, or transfer of any beneficial interest."

          (f)  Section 7.1.3 and Section 7.1.8 of the Loan Agreement are hereby
     deleted in their entirety.

     3.   Conditions Precedent.  The effectiveness of the amendments set forth
herein is subject to the satisfaction of the following conditions precedent
prior to or concurrently with the execution and delivery of this Amendment by
Lender:

          (a)  Borrower shall have duly executed and delivered this Amendment
     and an Allonge to the Note (the "Allonge"); and

          (b)  Lender shall have received evidence of the due authorization by
     Borrower and Guarantor, as applicable, of the execution and delivery of
     this Amendment and the Allonge and the consummation of the transactions
     contemplated herein and therein.

     4.   Representations and Warranties.  As a material inducement to Lender to
modify the Loan as aforesaid, Borrower represents and warrants to Lender that:

          (a)  This Amendment and the Allonge constitute a valid and legally
     binding obligation of Borrower enforceable in accordance with their
     respective terms and do not violate, conflict with, or constitute any
     default under any law or regulation binding on or applicable to Borrower,
     Borrower's limited partnership agreement, or any mortgage, lease, credit,
     loan agreement, contract, or other instrument binding upon or affecting
     Borrower;

          (b)  All representations and warranties contained in the Loan
     Documents are true and complete as of the date hereof, and Borrower hereby
     makes and publishes such representations and warranties in their entirety;

          (c)  No Default or event that, with the passage of time or the giving
     of notice (or both) would constitute a Default, under the Loan Documents
     has occurred and is continuing as of the date hereof; and

          (d)  No setoffs, defenses, claims, or counterclaims on the part of
     Borrower to payment or performance of the obligations evidenced or created
     by the Loan Documents, as modified and supplemented pursuant to this
     Amendment and the other Amendment Documents, exists as of the date hereof.

Borrower agrees that the falsity or inaccuracy of any of the foregoing
representations and warranties in any material respect shall constitute a
Default pursuant to the Loan Documents.

     5.   Guarantor's Consent.  Guarantor hereby (i) consents to the execution
and delivery of this Amendment by Borrower and the consummation of the
transactions described therein, (ii) agrees to be bound by the terms of this
Amendment, (iii) agrees to be bound by the terms and conditions of this
Amendment, and (iv) acknowledges and agrees that the Guaranty shall remain in
full force and effect and that Lender's rights and remedies thereunder shall not
be limited,

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             First Amendment to Loan Agreement and Other Loan Documents - Page 3
                              Wells Operating Partnership, L.P. - Revolving Loan
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impaired, waived, or released in any respect as the result of the execution and
delivery of this Amendment and the consummation of the transactions described or
contemplated therein.

     6.   No Novation.  The execution and delivery of this Amendment and the
Allonge shall not be interpreted or construed as, and in fact does not
constitute, a novation, payment, or satisfaction of all or any portion of the
Loan; rather, this Amendment and the Allonge are strictly amendatory in nature.
The Loan shall continue to be secured by the Security Deed, as herein amended,
without change in nature, amount, or priority.

     7.   Expenses.  Borrower shall pay or reimburse Lender, upon Lender's
demand therefor, for all reasonable expenses incurred by Lender in connection
with the negotiation, preparation, execution, and, if applicable, the
recordation of this Amendment and the other Amendment Documents, including,
without limitation, attorneys' fees and expenses of Lender's counsel, title
insurance premiums, and recording taxes and fees.

     8.   Document Protocols.  This Amendment shall be governed by the Document
Protocols set forth in Article Nine of the Loan Agreement, which are
incorporated by reference into this Amendment as if fully set forth herein.

             [THE REMAINDER OF THIS PAGE LEFT BLANK INTENTIONALLY]

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             First Amendment to Loan Agreement and Other Loan Documents - Page 4
                              Wells Operating Partnership, L.P. - Revolving Loan
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     IN WITNESS WHEREOF, the parties have executed this Amendment on the day and
year first above written, with the intention that this Amendment take effect as
an instrument under seal.

                              WELLS OPERATING PARTNERSHIP, L.P., a
                              Delaware limited partnership

                              By:  Wells Real Estate Investment Trust, Inc., a
                                   Maryland corporation,
                                   Its sole General Partner

                                   By: /s/ Douglas P. Williams
                                       ------------------------------------
                                   Name: Douglas P. Williams
                                        -----------------------------------
                                   Title: Executive Vice President
                                         ----------------------------------
                                                        [Affix corporate seal]

                              WELLS REAL ESTATE INVESTMENT TRUST,
                              INC., a Maryland corporation

                              By: /s/ Douglas P. Williams
                                  -----------------------------------------
                              Name: Douglas P. Williams
                                    ---------------------------------------
                              Title: Executive Vice President
                                    ---------------------------------------
                                                        [Affix corporate seal]

                   [EXECUTIONS CONTINUED ON FOLLOWING PAGE]

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             First Amendment to Loan Agreement and Other Loan Documents - Page 5
                              Wells Operating Partnership, L.P. - Revolving Loan
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                              SOUTHTRUST BANK, an Alabama banking
                              corporation, successor by conversion to SouthTrust
                              Bank, National Association, a national banking
                              association

                              By: /s/ James R. Potter
                                 ------------------------------------
                              Name:     James R. Potter
                              Title:    Vice President

                              [END OF EXECUTIONS]

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             First Amendment to Loan Agreement and Other Loan Documents - Page 6
                              Wells Operating Partnership, L.P. - Revolving Loan<PAGE>

                                  EXHIBIT 10.57

                      SECOND NOTE MODIFICATION AGREEMENT
   RELATING TO THE SOUTHTRUST BANK N.A. $12,844,000 REVOLVING LINE OF CREDIT
<PAGE>

                      SECOND NOTE MODIFICATION AGREEMENT

     THIS SECOND NOTE MODIFICATION AGREEMENT (this "Agreement") is entered into
as of December 15, 2000, by and between WELLS OPERATING PARTNERSHIP, L.P., a
Delaware limited partnership ("Owner"), and SOUTHTRUST BANK, an Alabama banking
corporation (as successor by conversion to SouthTrust Bank, National
Association, a national banking association) ("Lender").

                               R e c i t a l s:

     Owner is the owner of an office building and related improvements located
on Tampa, Hillsborough County, Florida (the "Property").  The Property is
subject to a lien and security interest held by Lender as security for a loan
made by Lender to Carter Sunforest, L.P. ("Carter") in the principal amount of
$15,500,000.00 (the "Loan").  The Loan is governed by an Amended and Restated
Loan Agreement dated as of December 31, 1998, between Carter and Lender, as
amended pursuant to that certain First Amendment to Amended and Restated Loan
Agreement and Amended and Restated Promissory Note (the "First Amendment") dated
as of April 27, 1999, and as further amended pursuant to that certain Second
Amendment to Amended and Restated Loan Agreement and Other Loan Documents dated
of even date herewith (as amended, the "Loan Agreement") and is evidenced by an
Amended and Restated Promissory Note dated as of December 31, 1998, as amended
pursuant to the First Amendment, and as further amended pursuant to a Note
Modification Agreement dated as of September 1, 1999 (as amended, the "Note"),
in said principal amount payable by Carter to the order of Lender.  The Loan is
guaranteed by Owner ("Guarantor") pursuant to a Guaranty Agreement dated as of
December 31, 1998, as amended pursuant to a Guarantor Release and Consent
Agreement of even date herewith (as amended, the "Guaranty").

     Guarantor and Lender wish to amend the Note in certain respects and have
entered into this Agreement to evidence such amendment.

     NOW, THEREFORE, in consideration of the recitals and to induce the Lender
to modify the Note, the parties hereto agree as follows:

     1.  Modification of Note.  The Note is hereby amended in the following
respects:

          (a) Notwithstanding anything to the contrary in the Note, at no time
     shall the maximum principal indebtedness under the Note exceed the amount
     of $12,844,000.00.

          (b) The definition of "Eurodollar Rate" set forth on page two (2) of
     the Note is hereby amended to be and read as follows:

          "Eurodollar Rate" shall mean the rate per annum (rounded upwards, if
     necessary, to the nearest 0.0625%) equal to the Adjusted LIBOR plus one
     hundred seventy-five basis points (1.75%), which rate shall not fluctuate
     during each Interest Period."

                                                        Promissory Note - Page 1
<PAGE>

          (c) The definition of "Maturity Date" set forth on page two (2) of the
     Note is hereby amended to be and read as follows:

          "Maturity Date" shall mean June 10, 2002."

     2.   Confirmation of Obligations.  Except as herein modified, the Note
shall remain in full force and effect, and the Note, as so modified, is hereby
ratified and affirmed in all respects.  Guarantor confirms that it has no
claims, counterclaims, offsets, defenses, or rights of setoff or recoupment
against Lender with respect to its respective obligations under the Guaranty.
All references to the Note in the Guaranty and the other Loan Documents shall be
deemed to refer to the Note as herein modified and as the same may hereafter be
amended, renewed, extended, or decreased.

     3.   Expenses.  As a condition precedent to the effectiveness of this
Agreement,  Guarantor shall pay all costs and expenses incurred by Lender in
connection herewith, including any and all legal fees and expenses of Lender's
counsel.

     4.   Document Protocols.  This Amendment shall be governed by the Document
Protocols set forth in Exhibit A of the Loan Agreement, which are incorporated
by reference into this Agreement as if fully set forth herein.

     IN WITNESS WHEREOF, Guarantor and Lender have executed this Agreement with
the intent that it take effect as an instrument under seal.

                                  WELLS OPERATING PARTNERSHIP, L.P., a
                                  Delaware limited partnership

                                  By:  Wells Real Estate Investment Trust, Inc.,
                                       a Maryland corporation,
                                       Its sole General Partner

                                       By: /s/ Douglas P. Williams
                                          ----------------------------------
                                       Name: Douglas P. Williams
                                            --------------------------------
                                       Title: Executive Vice President
                                             -------------------------------

                                                       [Affix corporate seal]

                   [EXECUTIONS CONTINUED ON FOLLOWING PAGE]

_______________________________________________________________________________
                                     Second Note Modification Agreement - Page 2
                              Wells Operating Partnership, L.P. - Revolving Loan
<PAGE>

                              SOUTHTRUST BANK, an Alabama banking corporation,
                              successor by conversion to SouthTrust Bank,
                              National Association, a national banking
                              association

                              By: /s/ James R. Potter
                                 ------------------------------------
                              Name:    James R. Potter
                              Title:   Vice President

                              [END OF EXECUTIONS]

________________________________________________________________________________
                                     Second Note Modification Agreement - Page 3
                              Wells Operating Partnership, L.P. - Revolving Loan

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