Exhibit 10.2
FIRST AMENDMENT TO OFFER TO PURCHASE
     THIS FIRST AMENDMENT TO OFFER TO PURCHASE (this “Amendment”) is made and
entered into as of the 29th day of November, 2007, by and between TRIPLE NET
PROPERTIES, LLC, a Virginia limited liability company (hereinafter referred to
as “Buyer”) and AURORA MEDICAL GROUP, INC., a Wisconsin non-stock corporation
(hereinafter referred to as “Seller”).
RECITALS:
     A. Seller and Buyer entered into that certain Offer to Purchase dated as of
November 21, 2007 (the “Agreement”).
     B. An affiliate of Seller, Aurora Health Care, Inc., executed on line 315
of the Agreement, but the Seller signed the Rider that also comprises part of
the Agreement, and the parties desire to acknowledge Aurora Medical Group, Inc.
as the Seller and to ratify the Agreement.
     C. Buyer and Seller hereby desire to amend the Agreement as set forth
below.
     NOW, THEREFORE, for and in consideration of the mutual covenants contained
herein and other good and valuable consideration, the receipt and sufficiency of
which are hereby acknowledged by each party hereto, Seller and Buyer hereby
agree as follows:
     1. Aurora Medical Group, Inc. is deemed the “Seller” under the Agreement
for all purposes and by its execution of this Amendment ratifies and confirms
the Agreement.
     2. The Section of the Agreement beginning on line 35 of the Agreement,
which is entitled “Leased Property” is hereby amended by adding the following at
the end of the Section:
     “The initial Base Rent (as defined in the lease) under each lease shall be
as follows:

  (i)   Greenville — $79,103.00     (ii)   Suamico — $180,121.00     (iii)  
Kiel — $184,538.00     (iv)   Plymouth — $1,687,806.00     (v)   Waterford —
$457,860.00     (vi)   Wautoma — $394,650.00

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     3. Buyer acknowledges and agrees that the Condition Precedent to Buyer’s
obligation to close the transaction set forth in Section I(3) of the Rider to
the Agreement has been satisfied and is deleted.
     4. Except as expressly modified herein, the Agreement shall remain
unmodified and in full force and effect. Capitalized terms not defined herein
shall have the same meaning as in the Agreement.
     5. Seller and Buyer agree that this Amendment may be transmitted between
them by facsimile machine or email. The Seller and Buyer intend that faxed or
emailed signatures shall constitute original signatures and that a faxed or
emailed version of this Amendment containing the signature (original, faxed or
emailed) of Seller and Buyer shall be counterparts, each of which will
constitute an original and all of which shall comprise the entire Amendment.
[SIGNATURES APPEAR ON THE FOLLOWING PAGE]

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     IN WITNESS WHEREOF, Buyer and Seller have caused this Amendment to be
executed, as of the day and year first above written.
     SELLER:

            Aurora Medical Group, Inc.
A Wisconsin non-stock corporation
      By:   /s/ Robert O'Keefe         Name:   Robert O'Keefe        Title:   VP
- Treasury   

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     BUYER:

            TRIPLE NET PROPERTIES, LLC,
a Virginia limited liability company
      By:   /s/ Jeff Hanson         Name:   Jeff Hanson        Title:   Chief
Investment Officer        Date:   11/29/07     

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