<PAGE>
THIRD AMENDMENT
TO
SECOND AMENDED AND RESTATED
LIMITED PARTNERSHIP AGREEMENT
OF
CORPORATE OFFICE PROPERTIES, L.P.
THIS THIRD 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 September
29, 2000 by and among the undersigned parties.
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 by that certain First Amendment to Second Amended and Restated
Limited Partnership Agreement dated December 21, 1999 and by that certain Second
Amendment to Second Amended and Restated Limited Partnership Agreement dated
December 21, 1999 (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. The Partnership has entered into a certain Warrant Exchange Agreement
(the "Exchange Agreement") dated as of September 29, 2000 with United Properties
Group, Incorporated, a New York corporation ("UPG").
D. As required under Sections 2 and 3.1 of the Exchange Agreement, UPG
intends to transfer its interest in a certain warrant to purchase common units
in the Partnership (the "Warrant") to the Partnership in exchange for
partnership interests in the Partnership having designations, rights and
preferences as set forth in Section 5 of the Exchange Agreement (the "Series C
Preferred Units").
E. The parties desire to amend the Partnership Agreement to provide for the
contribution of the Warrant by UPG to the Partnership in exchange for the Series
C Preferred Units in accordance with Section 3.1 of the Exchange Agreement.
Unless otherwise defined herein, all capitalized terms used in this Amendment
shall have the same meanings as set forth in the Partnership Agreement.
NOW THEREFORE, in consideration of the foregoing and of the mutual premises
set forth herein, the parties hereto, intending to be legally bound hereby,
hereby amend the Partnership Agreement as follows, effective as of the date set
forth above.
<PAGE>
1. The foregoing recitals to this Amendment are hereby incorporated in and
made a part of this Amendment.
2. (a) Upon closing of the Exchange Agreement, UPG shall contribute the
Warrant to the Partnership.
(b) Upon the contribution of the Warrant to the Partnership by UPG, and
in accordance with Section 3.1 of the Exchange Agreement, the Partnership shall
issue to UPG 42,000 Series C Preferred Units, which Preferred Units shall
constitute Senior Preferred Units.
(c) For purposes of the Partnership Agreement, including the maintenance
of Capital Accounts, UPG shall be treated as making a Capital Contribution of
$1,050,000.
(d) The General Partner shall amend Exhibit 1 to the Partnership
Agreement by adding the Addendum to Exhibit 1 in the form attached hereto to
reflect the issuance of the Series C Preferred Units to UPG and the General
Partner hereby confirms certain rights attendant thereto, including, without
limitation, the rights to the Liquidation Preference and the Priority Return
Percentage set forth therein, and the right to convert such Preferred Units into
Partnership Units at the Conversion Factor set forth therein. The Conversion
Factor for the Series C Preferred Units shall be entitled to the same
anti-dilution protection applicable to the other Preferred Units previously
issued to UPG.
3. This Amendment shall take effect upon the closing of the transactions
contemplated by the Exchange Agreement, including without limitation the
contribution of the Warrant to the Partnership by UPG, and in the event such
closing does not occur, this Amendment shall be of no force or effect.
(REMAINDER OF PAGE INTENTIONALLY LEFT BLANK)
2
<PAGE>
In witness whereof, the parties hereto have caused their duly authorized
representatives to execute this Amendment as of the day and year first above
written.
UNITED PROPERTIES GROUP, INCORPORATED, a
New York corporation
By: /s/ JOSEPH S. THOMPSON
----------------------------
Name: Joseph S. Thompson
Its: Vice President
CORPORATE OFFICE PROPERTIES TRUST, a
Maryland Real Estate Investment Trust
By: /s/ ROGER A. WAESCHE, JR.
-------------------------------
Name: Roger A. Waesche, Jr.
Its: Senior Vice President and
Chief Financial Officer
3
<PAGE>
Exhibit 1
SCHEDULE OF PARTNERS
<TABLE>
<CAPTION>
Series A Series B Series C
Preferred Preferred Preferred
Partnership Partnership Partnership Partnership
Units Units Units Units
------------- -------------- ------------- --------------
<S> <C> <C> <C> <C>
GENERAL PARTNER
---------------
Corporate Office Properties Trust 18,275,296 1 1,250,000
LIMITED PARTNERS AND PREFERRED LIMITED PARTNERS
-----------------------------------------------
United Properties Group, Incorporated 1,016,662
Jay H. Shidler 452,878
Shidler Equities, L.P. 2,217,182
Clay W. Hamlin, III 417,138
LBCW Limited Partnership 3,246,007
CHLB Partnership 212,316
Robert L. Denton 434,910
James K. Davis 51,589
John E. De B. Blockey, Trustee of the John E. de B. Blockey
Living Trust dated 9/12/88 300,625
Henry D. Bullock 116,553
Frederick K. Ito Trust 29,140
June Y. I. Ito Trust 29,135
Bernice Reger 268,671
Denise J. Liszewski 34,333
Samuel Tang 22,889
David P. Hartsfield 30,519
Lawrence J. Taff 13,733
Kimberly F. Acquino 5,874
M.O.R. XXIX Associates Limited Partnership 148,381
M.O.R. 44 Gateway Associates Limited Partnership 1
Enterprise Nautical, Inc. 50,000
John Parsinen 90,000
John D. Parsinen, Jr. 10,000
New Parkway Domain Group Enterprises, LLC 206,768
M.O.R. Commons Limited Partnership 7
John Edward De Burgh Blockey and Sanda Juanita Blockey 50,476
---------- --- --------- ---------
26,714,421 1 1,250,000 1,016,662
========== === ========= =========
</TABLE>
4
<PAGE>
EXHIBIT 1 ADDENDUM
<TABLE>
<CAPTION>
Liquidation
Preference
Series No. of Per Priority Conversion
Preferred Preferred Preferred Preferred Return Conversion Commencement
Units Limited Partner Units Unit Percentage* Priority Factor Date
--------- --------------- --------- ----------- ---------- -------- ---------- ------------
<S> <C> <C> <C> <C> <C> <C> <C>
A General Partner 1 $25 1.375% Senior 1.8748 8/28/2000
B General Partner 1,250,000 $25 2.50% Senior None N/A
C UPG 1,016,662 $25 ** Senior 2.381 12/22/2000
</TABLE>
----------
* Priority Return Percentage is expressed per Distribution Period.
** Priority Percentage Return for the Series C Preferred Units shall be:
2.25% from December 21, 1999 to December 20, 2009;
2.625% from December 21, 2009 to December 20, 2014; and 3.00% thereafter.
The Distribution Period for the Series C Preferred Units shall be each
calendar quarter ending March 31, June 30, September 30 and December 31 of
each year.
5
