Document:

<PAGE>

                                                                   EXHIBIT 10.04

                                 THIRD AMENDMENT
                      TO AGREEMENT FOR PURCHASE AND SALE OF
                       REAL ESTATE AND ESCROW INSTRUCTIONS

         THIS THIRD AMENDMENT TO AGREEMENT FOR PURCHASE AND SALE OF REAL
PROPERTY AND ESCROW INSTRUCTIONS (this " Amendment") dated effective as of July
8, 2004, is made by and between WESTERN PLACE SKYRISE, LTD., a Texas limited
partnership, with its offices at 18111 Preston Road, Suite 1000, Dallas, Texas
75252 (hereinafter called "SELLER"), and TRIPLE NET PROPERTIES, LLC, a Texas
limited partnership, with offices at (hereinafter called "BUYER").

                                    RECITALS:

         A.       Seller and Buyer entered into that certain Agreement for
Purchase and Sale of Real Property and Escrow Instructions, dated as of February
27, 2004 (as amended by First Amendment to Agreement for Purchase and Sale of
Real Property and Escrow Instructions dated march 29, 2004, and as amended and
reinstated by Reinstatement and Second amendment to Agreement for Purchase and
Sale of Real Estate and Escrow Instructions, the "PSA") pertaining to the
property known as Western Place I & II, located at 6000 and 6100 Western Place,
Fort Worth, Texas, and more particularly described in the PSA. All capitalized
terms not defined herein shall have the same meaning given to them in the PSA.

         B.       The parties desire to further amend the PSA.

                                   AGREEMENT:

         NOW, THEREFORE, for and in consideration of the foregoing recitals, Ten
and No/100 Dollars ($10.00) in hand paid, and other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged,
Seller and Buyer hereby agree as follows:

         1.       Buyer hereby instructs the Escrow Holder to immediately
release and deliver to Seller the Deposit in the amount of $750,000, plus all
interest accrued thereon in accordance with Seller's wiring instructions. In the
event the Close of Escrow occurs on or before July 23, 2004, the Buyer shall
receive a credit for the Deposit against the Purchase Price.

         2.       Subsection 6.2 of the Agreement is deleted and the following
is substituted in lieu thereof:

                  (a)      "6.2 Close of Escrow. Escrow shall close ("CLOSE OF
                           ESCROW") on or before July 23, 2004, or such earlier
                           date as may be agreed upon in writing by the parties.

         3.       As a condition precedent to Seller's obligation to sell the
Property to Buyer, Buyer and Fobare Commercial, L.P. shall have entered into a
property management agreement in the form of Exhibit "A" attached hereto and
made a part hereof, and a Broker Listing Agreement in the form of Exhibit "B"
attached hereto and made a part hereof.

<PAGE>

         4.       Buyer acknowledges that Seller has complied with all
conditions precedent to the Close of Escrow.

         5.       Seller acknowledges that Buyer will assign all of Buyer's
right, title and interest in and to the PSA to NNN Western Place, LLC as to an
undivided 21.5% and GREIT- Western Place, LP as to an undivided 78.5%, and
Seller agrees that the Property will be conveyed to such entities, in such
proportions at the Close of Escrow.

         6.       Except as expressly amended hereby, all other terms and
conditions of the PSA are and shall remain in full force and effect.

         7.       Facsimile signatures appearing hereon shall be deemed to be
originals, and this Amendment may be executed in two or more counterparts, each
of which shall be deemed originals and all of which together shall constitute
one and the same instrument.

              [THE REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK]

                            [SIGNATURE PAGES FOLLOW]

                                       -2-

<PAGE>

         IN WITNESS WHEREOF, each of the undersigned, by its duly authorized
representative, hereby executes and delivers this Amendment as of the date first
above written.

                                       SELLER:

                                       WESTERN PLACE SKYRISE, LTD.,
                                       a Texas limited partnership

                                       By: Western Place Skyrise GP, LLC,
                                           a Texas limited liability company

                                       By: ____________________________________
                                       Name: __________________________________
                                       Title: _________________________________

                                       -3-

<PAGE>

         IN WITNESS WHEREOF, each of the undersigned, by its duly authorized
representative, hereby executes and delivers this Amendment as of the date first
above written.

                                       BUYER:

                                       TRIPLE NET PROPERTIES, LLC,
                                       a Virginia limited liability company

                                       By: /s/ RICK HUTTON
                                          -------------------------------------
                                       Name: Rick Hutton
                                       Title: CFO

                                       -4-<PAGE>
                                                                 EXHIBIT 4.6 (b)

                                 AMENDMENT NO. 3
                            DATED AS OF MAY 21, 2004
                                    TO OFFER
                          DATED AS OF DECEMBER 3, 2001

          Amendment No. 3 dated as of May 21, 2004 (the "Amendment") between
IDEX CORPORATION (the "Borrower") and CALYON NEW YORK BRANCH (successor in
interest to Credit Lyonnais New York Branch, the "Lender") to the Offer dated as
of December 3, 2001 (the "Offer") for an uncommitted line of credit by the
Lender in favor of the Borrower.

          WHEREAS, the Borrower has requested that the Lender amend the Offer by
extending the Expiration Date, and that the Offer be modified in certain other
respects, and

          WHEREAS, the Lender is willing to amend the Offer and grant such
request on and subject to the terms and conditions hereinafter set forth.

     NOW, THEREFORE, IT IS AGREED:

          SECTION 1. Capitalized Terms. All terms used but not otherwise defined
herein shall have the meaning ascribed to them in the Offer.

          SECTION 2. Amendments to Offer. The Offer is, effective as of the date
hereof and subject to the satisfaction of the conditions precedent set forth in
Section 3 below, hereby amended as follows:

          The definition of "Expiration Date" in Section 1 of the Offer is
          hereby amended in clause (i) to state: "May 20, 2005."

          SECTION 3. Conditions to Effectiveness. This Amendment shall become
effective as of the date first written above when the Lender shall have received
(i) counterparts of this Amendment executed by the Borrower and the Lender, (ii)
a new Promissory Note (the "New Note") in favor of the Lender in the form
annexed hereto on Exhibit A in replacement of the Promissory Note dated May 24,
2003 in the principal amount of $30,000,000 (the "Old Note"), and (iii) such
other documents, instruments or agreement as the Lender shall reasonably
request. Upon its receipt of the New Note, duly executed by the Borrower, the
Lender shall return the Old Note to the Borrower marked "canceled".

          SECTION 4. Representations and Warranties. The Borrower hereby
represents and warrants that as of the date of effectiveness of this Amendment,
all representations and warranties set forth in the Offer are true and correct
as of such date, with each reference therein to the Offer meaning a reference to
the Offer as amended hereby.

          SECTION 5. Reference to and Effect on Credit Documents.

     (a) Upon the effectiveness hereof, on and after the date hereof, each
reference in the Credit Documents to "this Offer", "hereunder", "hereof" or
words of like import referring to the Offer and each reference in instruments
and documents delivered in connection therewith to "the Offer", "thereunder",
"thereof" or words of like import referring to the Offer shall mean and be a
reference to the Offer, as amended hereby.

     (b) Except as expressly modified hereby, the terms and provisions of the
Offer and each Credit Document shall remain in full force and effect and is
hereby ratified in all respects by the Borrower.

     (c) The execution, delivery and effectiveness of this Amendment shall
neither operate as a waiver of any rights, power or remedy of the Lender under
any of the Credit Documents nor constitute a waiver of any provision of any of
the Credit Documents.

                                       19
<PAGE>

          SECTION 6. Governing Law. This Amendment shall be governed by and
construed in accordance with the laws of the State of New York, without regard
to its conflicts of laws principles.

          SECTION 7. Execution in Counterparts.This Amendment may be executed in
any number of counterparts and by different parties hereto in separate
counterparts, each of which when so executed and delivered shall be deemed to be
an original and all of which taken together shall constitute but one and the
same agreement. Delivery of an executed counterpart of a signature page to this
Amendment by telecopier shall be effective as delivery of a manually executed
counterpart of this Amendment.

          IN WITNESS WHEREOF, the parties hereto through their duly authorized
representatives have set their hand as of the date first written above.

                                IDEX CORPORATION

                                By:
                                   --------------------------------------
                                Name:
                                Title:

                                CALYON NEW YORK BRANCH

                                By:
                                   --------------------------------------
                                Name:
                                Title:

                                By:
                                   --------------------------------------
                                Name:
                                Title:

                                       20
<PAGE>

                                                                       Exhibit A
                                      NOTE

                                                             New York, New York

$30,000,000                                              May 21, 2004

         For value received, IDEX CORPORATION, a Delaware corporation
("Borrower"), pomises to pay to the order of CALYON NEW YORK BRANCH ("Lender")
the lesser of (a) Thirty Million United States Dollars ($30,000,000) and (b) the
aggregate unpaid principal amount of the Loans made by Lender to Borrower
pursuant to the Offer (as hereinafter defined) on the dates provided for
therein. Borrower promises to pay interest on the unpaid principal amount of
each such Loan on the dates and at the rate or rates provided for in the Offer.
All such payments of principal and interest shall be made in lawful money of the
United States in Federal or other immediately available funds at the office of
Calyon New York Branch, 1301 Avenue of the Americas, New York, NY 10019.

         All Loans made by Lender, the respective types and maturities thereof
and all repayments of the principal thereof shall be recorded by Lender and, if
Lender so elects in connection with any transfer or enforcement hereof,
appropriate notations to evidence the foregoing information with respect to each
such Loan then outstanding may be endorsed by Lender in the schedule attached
hereto or on a continuation of such schedule attached to and made a part hereof;
provided, however, that the failure of Lender to make any such recordation or
endorsement shall not affect the obligation of Borrower hereunder or under the
Offer.

         This note is the Note referred to in the Offer, dated as of December 3,
2001, between Borrower and Lender (as amended, and as the same may be amended,
supplemented or otherwise modified from time to time, the "Offer"). Terms
defined in the Offer are used herein with the same meanings. Reference is made
to the provisions of the Offer for, among other things, prepayment of the Loans
and the acceleration of the maturity thereof.

         This Note is issued in substitution for, but not in repayment of, the
Note dated May 24, 2003. Any Loans outstanding under such prior Note shall
constitute loans under, evidenced by and subject to the terms of this Note.

         This Note shall be governed by and construed in accordance with the
laws of the State of New York.

                                IDEX CORPORATION

                                By:
                                   --------------------------------------
                                Name:
                                Title:

                                       21

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00069-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00069-of-00352.parquet"}]]