EXHIBIT 99.1

THIRTIETH AMENDMENT
TO
SECOND AMENDED AND RESTATED
LIMITED PARTNERSHIP AGREEMENT
OF
CORPORATE OFFICE PROPERTIES, L.P.

This Thirtieth Amendment (the “Amendment”) to the Second Amended and Restated Limited Partnership Agreement Of Corporate Office Properties, L.P., a Delaware limited partnership (the Partnership), is made and entered into as of July 16, 2013, by the undersigned.

Recitals

A.    The Partnership is a limited partnership organized under the Delaware Revised Uniform Limited Partnership Act and governed by that certain Second Amended and Restated Limited Partnership Agreement dated as of December 7, 1999, as amended to the date hereof (as amended, the “Partnership Agreement”).

B.    The sole general partner of the Partnership is Corporate Office Properties Trust, a real estate investment trust formed under the laws of the State of Maryland (the “General Partner”).

C.    Pursuant to Section 11.1 (b) (iii), the General Partner desires to amend the Partnership Agreement to reflect the admission, substitution, termination and/or withdrawal of various limited partners in accordance with the terms of the Partnership Agreement.

NOW THEREFORE, the General Partner, intending to be legally bound, hereby amends the Partnership Agreement as follows, effective as of the date first set forth above.

1.
Exhibit 1, Schedule of Partners, as attached hereto and by this reference made a part hereof, is hereby substituted for and intended to replace any prior Exhibit 1 attached to a prior Amendment to the Partnership Agreement, and as attached hereto shall be a full and complete listing of all the general and limited partners of the Partnership as of the date of this Amendment, same being intended and hereby superceding all prior Exhibit 1 listings.

In Witness Whereof, the General Partner has executed this Amendment as of the day and year first above written.

Corporate Office Properties Trust, a
Maryland Real Estate Investment Trust


By:     /s/ Roger A. Waesche, Jr.
Roger A. Waesche, Jr.
President & Chief Executive Officer





Exhibit 1 Addendum--30th Amendment
Schedule of Partners
 
 
General Partner
 
Common Units of Partnership Units
 
Series H Preferred Units
 
Series I Preferred Units
 
Series K Preferred Units
 
Series L Preferred Units
Corporate Office Properties Trust
 
87,355,403

 
2,000,000

 
 
 
531,667

 
6,900,000

 
 
 
 
 
 
 
 
 
 
 
Limited Partners and Preferred Limited Partners
 
 
 
 
 
 
 
 
 
 
Jay H. Shidler
 
431,893

 
 
 
 
 
 
 
 
Shidler Equities, L.P.
 
1,353,963

 
 
 
 
 
 
 
 
Clay W. Hamlin, III
 
63,244

 
 
 
 
 
 
 
 
LBCW Limited Partnership
 
841,107

 
 
 
 
 
 
 
 
Robert L. Denton
 
329,000

 
 
 
 
 
 
 
 
James K. Davis
 
51,589

 
 
 
 
 
 
 
 
Samuel Tang
 
4,389

 
 
 
 
 
 
 
 
Lawrence J. Taff
 
13,733

 
 
 
 
 
 
 
 
M.O.R. 44 Gateway Associates Limited Partnership
 
1

 
 
 
 
 
 
 
 
John Parsinen
 
49,434

 
 
 
 
 
 
 
 
M.O.R. Commons Limited Partnership
 
7

 
 
 
 
 
 
 
 
Lynn Hamlin
 
121,411

 
 
 
 
 
 
 
 
Housing Affiliates, Inc.
 
4,402

 
 
 
 
 
 
 
 
Reingle Corp.
 
730

 
 
 
 
 
 
 
 
Joseph Tawil
 
2,160

 
 
 
 
 
 
 
 
The Lovejoy Trust
 
59,528

 
 
 
 
 
 
 
 
The Century Trust
 
59,528

 
 
 
 
 
 
 
 
A. Charles Wilson, Trustee of the A. Charles Wilson and Betty S. Wilson Trust u/d/t June 18, 1980--Survivor's Trust
 
5,908

 
 
 
 
 
 
 
 
Irwin Hoffman
 
1,880

 
 
 
 
 
 
 
 
The Rouse Family Exemption Trust
 
2,160

 
 
 
 
 
 
 
 
Lawrence G. Rief
 
2,526

 
 
 
 
 
 
 
 
David D. Jenkins
 
262,165

 
 
 
 
 
 
 
 
RA & DM, Inc.
 
2,954

 
 
 
 
 
 
 
 
Richard Alter
 
43,817

 
 
 
 
 
 
 
 
Donald Manekin
 
23,336

 
 
 
 
 
 
 
 
William Winstead
 
14,019

 
 
 
 
 
 
 
 
Richard Manekin
 
8,988

 
 
 
 
 
 
 
 
Robert Manekin
 
8,988

 
 
 
 
 
 
 
 
Charles Manekin
 
3,899

 
 
 
 
 
 
 
 
Francine Manekin
 
880

 
 
 
 
 
 
 
 
Sandye Sirota
 
5,427

 
 
 
 
 
 
 
 
Lynn Stern
 
880

 
 
 
 
 
 
 
 
Louis LaPenna
 
2,513

 
 
 
 
 
 
 
 
Jamie Deutsch
 
22

 
 
 
 
 
 
 
 
Kelly Alter
 
22

 
 
 
 
 
 
 
 
Bryn Mawr Presbyterian Church
 
150

 
 
 
 
 
 
 
 
The Nichols School
 
1,870

 
 
 
 
 
 
 
 
TRC Associates Limited Partnership
 
 
 
 
 
352,000

 
 
 
 
TOTAL
 
91,133,926

 
2,000,000

 
352,000

 
531,667

 
6,900,000