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EXHIBIT 4.6

First Amendment, Consent and Waiver

First Potomac Realty Investment Limited Partnership

First Amendment, Consent and Waiver
Dated as of November 5, 2010

to

Note Purchase Agreement
Dated as of June 22, 2006

Re: $37,500,000 6.41% Senior Notes, Series A, due June 15, 2013
$37,500,000 6.55% Senior Notes, Series B, due June 15, 2016

First Amendment, Consent and Waiver to Note Purchase Agreement

This First Amendment, Consent and Waiver dated as of November 5, 2010 (the or this “First Amendment”) to the Note Purchase Agreement dated as of June 22, 2006 (the “Note Purchase Agreement”) is between First Potomac Realty Investment Limited Partnership, a Delaware limited partnership (the “Company”) and First Potomac Realty Trust, a Maryland real estate investment trust (the “Trust”, the Trust and the Company being herein sometimes collectively referred to as the “Obligors”), and each of the institutions which is a signatory to this First Amendment (collectively, the “Noteholders”).

Recitals:

A. The Obligors and each of the purchasers signatory to the Note Purchase Agreement have heretofore entered into the Note Purchase Agreement. The Company has heretofore issued the $37,500,000 6.41% Senior Notes, Series A, due June 15, 2013 and the $37,500,000 6.55% Senior Notes, Series B, due June 15, 2016 (collectively, the “Notes”) pursuant to the Note Purchase Agreement.

B. Concurrently with the execution of the Note Purchase Agreement, certain wholly owned Subsidiaries of the Obligors entered into that certain Guaranty Agreement, dated as of June 22, 2006, for the benefit of the holders of the Notes, pursuant to which such Subsidiaries (the “Subsidiary Guarantors”) guaranteed the Company’s obligations under the Notes and the Note Purchase Agreement (the “Subsidiary Guaranty”).

C. The Obligors and the Noteholders who have executed this First Amendment (such Noteholders representing at least 51% in principal amount of the Notes currently outstanding) now desire to amend and/or waive certain provisions of the Note Purchase Agreement upon a majority of the Noteholders’ acceptance in the space below and upon the satisfaction in full of each of the following conditions set forth in Section 2.1 hereto (the “Effective Date”) in the respects, but only in the respects, hereinafter set forth.

D. The Obligors and the Noteholders acknowledge that, in accordance with Section 17.2 of the Note Purchase Agreement, the Obligors must provide each Noteholder with sufficient information, 45 days in advance of the date a decision is required (the “Solicitation Period”), to enable such Noteholder to make an informed and considered decision with respect to any proposed amendment, waiver or consent in respect of any of the provisions of the Note Purchase Agreement or the Notes.

E. Notwithstanding the 45-day Solicitation Period required by Section 17.2 of the Note Purchase Agreement, the Obligors and the Noteholders now desire to waive the Solicitation Period.

F. Capitalized terms used herein shall have the respective meanings ascribed thereto in the Note Purchase Agreement unless herein defined or the context shall otherwise require.

G. All requirements of law have been fully complied with and all other acts and things necessary to make this First Amendment a valid, legal and binding instrument according to its terms for the purposes herein expressed have been done or performed.

Now, therefore, upon the full and complete satisfaction of the conditions precedent to the effectiveness of the First Amendment set forth in Section 2.1 hereof, and in consideration of good and valuable consideration the receipt and sufficiency of which is hereby acknowledged, the Obligors and the Noteholders do hereby agree as follows:

Section 1. Amendments.

Section 1.1. Section 9.7 of the Note Purchase Agreement shall be amended as follows:

The phrase “, other than Excluded Subsidiaries,” shall be inserted into the first sentence of Section 9.7 between the words “Subsidiaries” and “which”.

A new paragraph shall be added to Section 9.7 below current subparagraph (iv) and shall read as follows:

“In the event that at any time the Company or any Subsidiary provides a Lien to or for the benefit of the lenders under the Revolving Credit Agreement or the administrative agent on their behalf, then the Company will, and will cause each of its Subsidiaries that has provided any such Lien to, concurrently grant to and for the benefit of the holders of the Notes a similar first priority Lien (ranking pari passu with the Lien provided to or for the benefit of the lenders and/or the administrative agent, as the case may be, under such Revolving Credit Agreement), over the same assets, property and undertaking of the Company and the Subsidiary as those encumbered in respect of the Revolving Credit Agreement, in form and substance reasonably satisfactory to the Required Holders with such security to be the subject of an intercreditor agreement among the lenders and/or the administrative agent, as the case may be, under the Revolving Credit Agreement or the administrative agent on their behalf, as the case may be, and the holders of Notes, which shall be reasonably satisfactory in form and substance to the Required Holders.”

Section 1.2 A new Section 10.9 shall be added to the Note Purchase Agreement and shall read as follows:

“Section 10.9 Consolidated Debt Yield. As at the end of any fiscal quarter (i) for the fiscal quarter ending December 31, 2010 through the fiscal quarter ending September 30, 2011, the Consolidated Debt Yield (as defined in the Revolving Credit Agreement as of the date hereof, including relevant defined terms therein as of the date hereof) shall not be less than ten and one half of one percent (10.5%), and (ii) for each fiscal quarter ending on or after December 31, 2011, the Consolidated Debt Yield (as defined in the Revolving Credit Agreement as of the date hereof, including relevant defined terms therein as of the date hereof) shall not be less than eleven percent (11%).”

Section 1.3 A new Section 10.10 shall be added to the Note Purchase Agreement and shall read as follows:

“Section 10.10 Unencumbered Pool Interest Coverage Ratio. As of the end of any fiscal quarter, the ratio of (i) Adjusted Net Operating Income (as defined in the Revolving Credit Agreement as of the date hereof, including relevant defined terms therein as of the date hereof) for the applicable quarter, annualized; divided by (ii) the Unsecured Interest Expense (as defined in the Revolving Credit Agreement as of the date hereof, including relevant defined terms therein as of the date hereof) for the applicable quarter, annualized, shall not be less than 1.75 to 1.0.”

Section 1.4 Section 11(c) of the Note Purchase Agreement shall be amended and restated in its entirety to read as follows:

“(c) the Obligors default in the performance of or compliance with any term contained in Section 7.1(d), Sections 10.1 through 10.5 or Sections 10.9 or 10.10 and any such default is not remedied within 10 days after the occurrence of such default; or”

Section 1.4

Defined Terms. The “Defined Terms” section of the Note Purchase Agreement shall be amended as follows:

1. The definition of “Subsidiary Guarantor” shall be deleted in its entirety and replaced with the following definition: “Subsidiary Guarantor” is defined in Section 2.3(a) and shall include any Subsidiary Guarantor which is required to comply with the requirements of Section 9.7, provided however, that the definition of Subsidiary Guarantor shall not include any Excluded Subsidiary.

2. A new definition of “Excluded Subsidiary” shall be added to read as follows: “Excluded Subsidiary” means ACP East, LLC, ACP East Finance, LLC, AP Indian Creek, LLC, FP 500 First Street, LLC and Indian Creek Investors, LLC; provided, however, that if any such Excluded Subsidiary ceases to be prohibited by its organizational documents or loan documents or other related financing documents, each as in effect on the date hereof and without extension, replacement, modification or renewal thereof, from guaranteeing other indebtedness, then such Excluded Subsidiary shall cease to be an Excluded Subsidiary and the Obligors shall within 30 days thereafter cause such Subsidiary to execute and deliver to each holder of Notes a Subsidiary Guaranty.

Section 2. Agreements.

Section 2.1. This First Amendment shall become effective and binding upon the Company and the holders of the Notes on the Effective Date upon the satisfaction in full of each of the following conditions:

(a) The Obligors shall cause the following Subsidiaries, which currently are guarantors of the Company’s other unsecured Senior Indebtedness but not guarantors of the Company’s obligations under the Note Purchase Agreement and the Notes, to become Subsidiary Guarantors and to deliver to the holders of the Notes the documents and other evidence required by Section 9.7(i) through (iv):

FP Airpark AB, LLC
FP Chesterfield ABEF, LLC
FP Chesterfield CDGH, LLC
FP Gateway Center, LLC
FP Hanover AB, LLC
FP Hanover C, LLC
FP Hanover D, LLC
Glen Dale Business Center, LLC
Interstate Plaza Holding LLC
Interstate Plaza Operating LLC
Norfolk Commerce Park LLC

(b) The Obligors shall provide evidence, reasonably satisfactory to the Noteholders, of a name change of FP Sterling Park II, LLC (one of the existing Subsidiary Guarantors) to FP Sterling Park 6, LLC.

(c) Each holder of a Note shall have received this First Amendment, duly executed by the Company and the Trust.

(d) The holders of at least 51% in principal amount of the Notes outstanding shall have consented to this First Amendment as evidenced by their execution thereof.

(e) The representations and warranties of the Company set forth in Section 2.2 hereof shall be true and correct as of the date of the execution and delivery of this First Amendment.

(f) Each holder of a Note shall have received such certificates of officers of the Company and the Trust as it may reasonably request with respect to this First Amendment and the transactions contemplated hereby.

(g) In consideration of the agreement of the Noteholders to waive the existing default under the Note Purchase Agreement as set forth in Section 2.3 hereof and to consent to amend the Note Purchase Agreement as set forth herein, the Company hereby agrees to pay to each holder of a Note a consent fee in the amount of $0.50 per $1,000 principal amount of notes held by such holder of a Note (for an aggregate consent fee payable to all holders of the Notes in an amount equal to $37,500).

(h) The Company shall have paid the fees and disbursements of the holders’ special counsel, Chapman and Cutler LLP which fees and disbursements are reflected in the statement of such special counsel delivered to the Company at the time of the execution and delivery of this First Amendment.

Section 2.2. The Obligors hereby jointly and severally represent and warrant that as of the date hereof and as of the date of execution and delivery of this First Amendment:

(a) This First Amendment and the transactions contemplated hereby are within the legal powers of the Obligors, have been duly authorized by all necessary legal action on the part of the Obligors, and this First Amendment has been duly executed and delivered by the Obligors and constitutes a legal, valid and binding obligation of the Obligors enforceable against them in accordance with its terms.

(b) After giving effect to this First Amendment, no Defaults or Events of Default under the Note Purchase Agreement shall exist and be continuing.

(c) The execution, delivery and performance of this First Amendment by the Company does not and will not result in a violation of or default under (i) the limited partnership agreement of the Company, (ii) the declaration of trust or bylaws of the Trust, (iii) any agreement to which the Company is a party or by which it is bound or to which any of its properties is subject, (iv) any order, writ, injunction or decree binding on the Company, or (v) any statute, regulation, rule or other law applicable to the Company, except, in the case of (iii) through (v) above, for any violations or defaults that would not reasonably be expected to result in a Material Adverse Effect.

(d) No consent, approval or authorization of, or registration, filing or declaration with, any governmental authority is required in connection with the execution, delivery or performance by the Obligors of this First Amendment, except where the failure to obtain such consents, approvals or authorizations, or to make such filings or declarations, would not reasonably be expected to result in a Material Adverse Effect.

(e) Schedule A attached to this First Amendment lists properties owned by the Company which are encumbered by mortgages, together with the related income, asset values, maturity dates of the mortgages, dates of assumption and status as an Excluded Subsidiary, and such Schedule A is true and correct in all material respects.

(f) After giving effect to this First Amendment and the terms of Section 2.1, each Subsidiary which owns an Eligible Unencumbered Property or is an obligor, borrower or guarantor of Indebtedness (other than Excluded Subsidiaries) will have delivered a Subsidiary Guaranty.

Section 2.3. Upon and by virtue of this First Amendment becoming effective as herein contemplated, (i) the Default or Event of Default occurring solely as a result of the Obligors’ failure to cause certain of their respective Subsidiaries to become Subsidiary Guarantors in accordance with Section 9.7 of the Note Purchase Agreement, at all times prior to and including the Effective Date, shall be deemed to have been waived by the Noteholders, (ii) the Default or Event of Default occurring solely as a result of the Obligors’ failure to disclose, in accordance with Section 7.2(b) of the Note Purchase Agreement, the Company’s failure to comply with the provisions of Section 9.7 of the Note Purchase Agreement, at all times prior to and including the Effective Date, shall be deemed to have been waived by the Noteholders, and (iii) the Noteholders agree to waive, in connection with the Obligors’ seeking of this First Amendment, the 45-day Solicitation Period set forth in Section 17.2 of the Note Purchase Agreement. The Obligors understand and agree that the waivers contained in this Section 2.3 pertain only to the Defaults and Events of Default herein described in clauses (i) and (ii) of this Section 2.3 and to the extent so described and not to any other Default or Event of Default which may exist under, or any other matters arising in connection with, the Note Purchase Agreement or to any rights which the Noteholders have arising by virtue of any such other actions or matters.

Section 2.4. [REMOVED]

Section 2.5. This First Amendment shall be construed in connection with and as part of the Note Purchase Agreement, and except as modified and expressly amended by this First Amendment, all terms, conditions and covenants contained in the Note Purchase Agreement and the Notes are hereby ratified and shall be and remain in full force and effect.

Section 2.6. Any and all notices, requests, certificates and other instruments executed and delivered after the execution and delivery of this First Amendment may refer to the Note Purchase Agreement without making specific reference to this First Amendment but nevertheless all such references shall include this First Amendment unless the context otherwise requires.

Section 2.7. The descriptive headings of the various Sections or parts of this First Amendment are for convenience only and shall not affect the meaning or construction of any of the provisions hereof.

Section 2.8. This First Amendment shall be governed by and construed in accordance with the law of the State of New York.

Section 2.9. The execution hereof by you shall constitute a contract between us for the uses and purposes hereinabove set forth, and this First Amendment may be executed in any number of counterparts, each executed counterpart constituting an original, but all together only one agreement.

[Signature page follows]

IN WITNESS WHEREOF, we have hereunto set our hands as of the date first set forth above.

	First Potomac Realty Investment Limited Partnership
	By:		First Potomac Realty Trust
			Its sole general partner
	By:		/s/ Barry H. Bass   Name: Barry H. Bass
			Title: Executive Vice President and Chief Financial Officer
	First Potomac Realty Trust
	By:		/s/ Barry H. Bass   Name: Barry H. Bass
			Title: Executive Vice President and Chief Financial Officer

		1400 CAVALIER, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass
				Name:  Barry H. Bass
				Title:   Executive Vice President and Chief Financial Officer
		1441 CROSSWAYS BLVD., LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass   Name: Barry H. Bass
				Title: Executive Vice President and Chief Financial Officer
		FP ASHBURN, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass   Name: Barry H. Bass
				Title: Executive Vice President and Chief Financial Officer

(Signatures continued on next page)

		AIRPARK PLACE, LLC
		By:		Airpark Place Holdings LLC
				Its Sole Member
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass   Name: Barry H. Bass
				Title: Executive Vice President and Chief Financial Officer
		FP AMMENDALE COMMERCE CENTER, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass   Name: Barry H. Bass
				Title: Executive Vice President and Chief Financial Officer
		AQUIA TWO, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass   Name: Barry H. Bass
				Title: Executive Vice President and Chief Financial Officer

(Signatures continued on next page)

		CROSSWAYS II LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass   Name: Barry H. Bass
				Title: Executive Vice President and Chief Financial Officer
		FPR HOLDINGS LIMITED PARTNERSHIP
		By:		FPR General Partner, LLC
				Its General Partner
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass   Name: Barry H. Bass
				Title: Executive Vice President and Chief Financial Officer
		FP DAVIS DRIVE LOT 5, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass   Name: Barry H. Bass
				Title: Executive Vice President and Chief Financial Officer

(Signatures continued on next page)

		FP PROPERTIES, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass   Name: Barry H. Bass
				Title: Executive Vice President and Chief Financial Officer
		FP PROPERTIES II, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass   Name: Barry H. Bass
				Title: Executive Vice President and Chief Financial Officer
		FP DIAMOND HILL, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass
				Name: Barry H. Bass
				Title: Executive Vice President and Chief Financial Officer

(Signatures continued on next page)

		FP CAMPOSTELLA ROAD, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass
				Name: Barry H. Bass
				Title:   Executive Vice President and Chief Financial Officer
		GATEWAY HAMPTON ROADS, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass   Name: Barry H. Bass
				Title: Executive Vice President and Chief Financial Officer
		FP GATEWAY 270, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass
				Name: Barry H. Bass
				Title:   Executive Vice President and Chief Financial Officer

(Signatures continued on next page)

		GATEWAY MANASSAS II, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass   Name: Barry H. Bass
				Title: Executive Vice President and Chief Financial Officer
		FP 2550 ELLSMERE AVENUE, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass   Name: Barry H. Bass
				Title: Executive Vice President and Chief Financial Officer
		FP GATEWAY WEST II, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass   Name: Barry H. Bass
				Title: Executive Vice President and Chief Financial Officer

(Signatures continued on next page)

		FP GOLDENROD LANE, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass
				Name: Barry H. Bass
				Title:   Executive Vice President and Chief Financial Officer
		GTC I SECOND LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass   Name: Barry H. Bass
				Title:   Executive Vice President and Chief Financial Officer

		FP HANOVER AB, LLC
		By:		FPR Holdings Limited Partnership
				Its Sole Member
		By:		FPR General Partner, LLC
				Its General Partner
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass   Name: Barry H. Bass
				Title:   Executive Vice President and Chief Financial Officer

(Signatures continued on next page)

		HERNDON CORPORATE CENTER, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass
				Name:		Barry H. Bass
				Title:		Executive Vice President and Chief Financial Officer
		LINDEN II, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass
				Name:		Barry H. Bass
				Title:		Executive Vice President and Chief Financial Officer
		LUCAS WAY HAMPTON, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass
				Name:		Barry H. Bass
				Title:		Executive Vice President and Chief Financial Officer

(Signatures continued on next page)

		FP PARK CENTRAL V, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass
				Name:		Barry H. Bass
				Title:		Executive Vice President and Chief Financial Officer
		FP PATRICK CENTER, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass
				Name:		Barry H. Bass
				Title:		Executive Vice President and Chief Financial Officer
		FP PINE GLEN, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass
				Name:		Barry H. Bass
				Title:		Executive Vice President and Chief Financial Officer

(Signatures continued on next page)

		RESTON BUSINESS CAMPUS, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass
				Name:		Barry H. Bass
				Title:		Executive Vice President and Chief Financial Officer
		FP RIVERS BEND, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass
				Name:		Barry H. Bass
				Title:		Executive Vice President and Chief Financial Officer
		FP 500 & 600 HP WAY, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass
				Name:		Barry H. Bass
				Title:		Executive Vice President and Chief Financial Officer

(Signatures continued on next page)

		FP 1408 STEPHANIE WAY, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass
				Name:		Barry H. Bass
				Title:		Executive Vice President and Chief Financial Officer
		FP STERLING PARK I, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass
				Name:		Barry H. Bass
				Title:		Executive Vice President and Chief Financial Officer

(Signatures continued on next page)

		FP STERLING PARK 6, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass
				Name:		Barry H. Bass
				Title:		Executive Vice President and Chief Financial Officer
		FP STERLING PARK 7, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass
				Name:		Barry H. Bass
				Title:		Executive Vice President and Chief Financial Officer
		FP STERLING PARK LAND, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass
				Name:		Barry H. Bass
				Title:		Executive Vice President and Chief Financial Officer
		VIRGINIA CENTER, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass
				Name:		Barry H. Bass
				Title:		Executive Vice President and Chief Financial Officer

(Signatures continued on next page)

		FP WEST PARK, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass
				Name:		Barry H. Bass
				Title:		Executive Vice President and Chief Financial Officer
		FP CRONRIDGE DRIVE, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass
				Name:		Barry H. Bass
				Title:		Executive Vice President and Chief Financial Officer
		FP GIRARD BUSINESS CENTER, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass
				Name:		Barry H. Bass
				Title:		Executive Vice President and Chief Financial Officer

(Signatures continued on next page)

		FP GIRARD PLACE, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass
				Name:		Barry H. Bass
				Title:		Executive Vice President and Chief Financial Officer
		TECHCOURT, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass
				Name:		Barry H. Bass
				Title:		Executive Vice President and Chief Financial Officer
		FP PARK CENTRAL I, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass
				Name:		Barry H. Bass
				Title:		Executive Vice President and Chief Financial Officer

(Signatures continued on next page)

		FP TRIANGLE, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass
				Name:		Barry H. Bass
				Title:		Executive Vice President and Chief Financial Officer
		15395 JOHN MARSHALL HIGHWAY, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass
				Name:		Barry H. Bass
				Title:		Executive Vice President and Chief Financial Officer
		WINDSOR AT BATTLEFIELD, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass
				Name:		Barry H. Bass
				Title:		Executive Vice President and Chief Financial Officer

(Signatures continued on next page)

		FP NORTHRIDGE, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass
				Name:		Barry H. Bass
				Title:		Executive Vice President and Chief Financial Officer
		FP 1408 STEPHANIE WAY, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass
				Name:		Barry H. Bass
				Title:		Executive Vice President and Chief Financial Officer
		FP GOLDENROD LANE LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass
				Name:		Barry H. Bass
				Title:		Executive Vice President and Chief Financial Officer

(Signatures continued on next page)

		FP GREENBRIER CIRCLE, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass
				Name:		Barry H. Bass
				Title:		Executive Vice President and Chief Financial Officer
		FP PARK CENTRAL II, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass
				Name:		Barry H. Bass
				Title:		Executive Vice President and Chief Financial Officer
		4212 TECHCOURT, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass
				Name:		Barry H. Bass
				Title:		Executive Vice President and Chief Financial Officer

(Signatures continued on next page)

		FP 3 FLINT HILL, LLC
		By:		First Potomac Realty Investment Limited Partnership
				Its Sole Member
		By:		First Potomac Realty Trust
				Its General Partner
		By:		/s/ Barry H. Bass
				Name:		Barry H. Bass
				Title:		Executive Vice President and Chief Financial Officer

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