**Exhibit 10.30****PROMISSORY NOTE**$ 14,900,000.00 April 27, 2006     For value received, 2525 N WOODLAWN VSTRM WICHITA KS, LLC, a Delaware limited liabilitycompany, CI05 CLINTONVILLE WI LLC, a Delaware limited liability company and MSI05-3 LLC, a Delawarelimited liability company, having an address at in care of Gladstone Commercial Corporation, 1521Westbranch Drive, Suite 200, McLean, Virginia 22102(collectively **“****Maker****”),**promises to pay to theorder of IXIS REAL ESTATE CAPITAL INC., a New York corporation, at its principal place of businessat 9 West 57th Street, New York, New York 10019 (together with its successors and assigns **“Payee”),**or at such place as the holder hereof may from time to time designate in writing, the principal sumof FOURTEEN MILLION NINE HUNDRED THOUSAND and No/100 Dollars ($14,900,000.00), in lawful money ofthe United States of America, with interest on the unpaid principal balance from time to timeoutstanding to be computed in the manner, at the times and, subject to the provisions of Section2.2.2 of the Loan Agreement (as hereinafter defined), at the Interest Rate provided in that certainLoan Agreement (as amended, modified, restated, consolidated, replaced or supplemented from time totime, the **“Loan Agreement”)**dated as of the date hereof between Maker and Payee. Capitalized termsused but not defined herein shall have the respective meanings given such terms in the LoanAgreement.     **1. ****Payment Terms.** Maker shall pay the Monthly Debt Service Payment Amount toPayee in the manner and at the times specified in Article 2 of the Loan Agreement, whichpayments shall be applied in the order of priority set forth in said Article 2. Maker shallalso payto Payee interest at the Default Rate, Late Payment Charges, the Yield Maintenance Premium, ifany, and all other amounts due and payable as and when provided for in the Loan Agreement.The balance of the Principal, together with all accrued and unpaid interest thereon, and allotheramounts payable to Payee hereunder, under the Loan Agreement and under the other LoanDocuments shall be due and payable on the Maturity Date.     **2. ****Loan Documents.** This Note is evidence of that certain loan made by Payee toMaker contemporaneously herewith and is executed pursuant to the terms and conditions of theLoan Agreement. This Note is secured by and entitled to the benefits of the Mortgages and theother Loan Documents. Reference is made to the Loan Documents for a description of thenature and extent of the security afforded thereby, the rights of the holder hereof in respectofsuch security, the terms and conditions upon which this Note is secured and the rights anddutiesof the holder of this Note. All of the agreements, conditions, covenants, provisions andstipulations contained in the Loan Agreement and the other Loan Documents are by thisreference hereby made part of this Note to the same extent and with the same force and effectasif they were fully set forth in this Note, and Maker covenants and agrees to keep and performthesame, or cause the same to be kept and performed, in accordance with their terms.     **3. ****Loan Acceleration; Prepayment.** The Debt shall, without notice, becomeimmediately due and payable at the option of Payee upon the happening of any Event of Default.This Note may not be prepaid except as otherwise expressly provided in, and subject to thetermsand conditions, of the Loan Agreement.
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     **4.** **Revival**. To the extent that Maker makes a payment or Payee receives anypayment or proceeds for Maker’s benefit, which are subsequently invalidated, declared to befraudulent or preferential, set aside or required to be repaid to a trustee, debtor inpossession,receiver, custodian or any other party under the Bankruptcy Code or any other bankruptcy law,common law or equitable cause, then, to such extent, the obligations of Maker hereunderintended to be satisfied shall be revived and continue as if such payment or proceeds had notbeen received by Payee.     **5.** **Amendments**. This Note may not be modified, amended, waived, extended,changed, discharged or terminated orally or by any act or failure to act on the part of MakerorPayee, but only by an agreement in writing signed by the party against whom enforcement of anymodification, amendment, waiver, extension, change, discharge or termination is sought.Whenever used, the singular number shall include the plural, the plural the singular, and thewords ***“Payee”***and ***“Maker”***shall include their respective successors, assigns, heirs, executorsand administrators. If Maker consists of more than one person or party, the obligations andliabilities of each such person or party shall be joint and several.     **6.** **Waiver**. Maker and all others who may become liable for the payment of all or anypart of the Debt do hereby severally waive presentment and demand for payment, notice of dishonor,protest, notice of protest, notice of nonpayment, notice of intent to accelerate the maturityhereof and of acceleration. No release of any security for the Debt or any Person liable forpayment of the Debt, no extension of time for payment of this Note or any installment hereof, andno alteration, amendment or waiver of any provision of the Loan Documents made by agreement betweenPayee and any other person or party shall release, modify, amend, waive, extend, change, discharge,terminate or affect the liability of Maker, and any other Person or party who may become liableunder the Loan Documents, for the payment of all or any part of the Debt.     **7.** **Exculpation**. It is expressly agreed that recourse against Maker for failure toperform and observe its obligations contained in this Note shall be limited as and to theextentprovided in Section 10.1 of the Loan Agreement.     **8.** **Notices**. All notices or other communications required or permitted to be givenpursuant hereto shall be given in the manner specified in the Loan Agreement directed to theparties at their respective addresses as provided therein.     **9.** **GoverningLaw**.**THIS NOTE SHALL BE GOVERNED BY ANDCONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORKAND THE APPLICABLE LAWS OF THE UNITED STATES OF AMERICA, WHICH LAWS OF THE UNITED STATES OFAMERICA SHALL, TO THE EXTENT THE SAME PREEMPT SUCH STATE LAWS, GOVERN AND BE CONTROLLING.**
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     IN WITNESS WHEREOF, Maker has executed this Note as of the date first written above.     **MAKER:**