Exhibit 10.13

            EXTENSION AGREEMENT AND ALLONGE TO DEED OF TRUST NOTE

         THIS EXTENSION AGREEMENT AND ALLONGE TO DEED OF TRUST NOTE (this 
"Allonge") is made this 1st day of July, 1994, by and between BROWN'S WHARF 
LIMITED PARTNERSHIP, a Maryland limited partnership (the "Borrower") and 
MERCANTILE-SAFE DEPOSIT AND TRUST COMPANY, a Maryland banking corporation 
(the "Bank").

                                 RECITALS

         A.  On September 20, 1988, the Bank made a construction loan to the 
Borrower in the original principal amount of Eleven Million Eight Hundred 
Thousand and 00/100 Dollars ($11,800,000.00) (the "Loan") or so much as may 
be advanced pursuant to the terms of a Building Loan Agreement of even date 
therewith by and between the Borrower and the Bank (the "Loan Agreement").

         B.  The Loan is evidenced by a Deed of Trust Note of even date 
therewith from the Borrower to the Bank (the "Original Note").  The Original 
Note is secured by a Deed of Trust and Security Agreement of even date 
therewith from the Borrower, as grantor, to Herbert B. Williams and Bruce D. 
McClean, trustees for the benefit of the Bank and recorded among the Land 
Records of Baltimore City at Liber 1841, folio 110 (the "Original Deed of 
Trust").  The Original Deed of Trust encumbers certain real property located 
in Baltimore City, Maryland and more particularly described therein (the 
"Property").

         C.  Repayment of the Loan is guaranteed by a Guaranty dated 
September 20, 1988, executed by Constellation Properties, Inc., a Maryland 
corporation ("CPI") (the "Original CPI Guaranty") and a Guaranty dated 
October 21, 1992, executed by Constellation Real Estate Group, Inc., a 
Maryland corporation ("CRE") (the "Original CRE Guaranty").  CPI and CRE are 
hereinafter sometimes collectively referred to as the "Guarantor".  CPI is a 
general partner of the Borrower.

         D.  The Original Note is also secured by an Assignment of Lessor's 
Interest in Leases and Guarantees dated September 20, 1988 (the "Original 
Assignment of Leases").  The Original Note, the Original Deed of Trust, the 
Original CPI Guaranty, the Original CRE Guaranty, the Original Assignment of 
Leases, the Loan Agreement, Financing Statements, together with any and all 
other documents evidencing or securing the Loan, are hereinafter sometimes 
collectively referred to as the "Original Loan Documents".



         E.  At the request of the Borrower and Guarantor, the Bank has 
agreed to modify the maturity date, the interest rate and other terms and 
conditions of the Loan.  In return, CPI, as the owner of several adjacent 
parcels of land, has agreed to grant the Bank a lien on approximately six (6) 
acres more or less, of additional property located in Baltimore City, 
Maryland (the "Additional Collateral").

         F.  The Bank has requested, and the Borrower and Guarantor have 
agreed, that (a) the Borrower and Guarantor execute and deliver (i) this 
Allonge, (ii) a Supplemental Deed of Trust, Assignment of Rents, and Security 
Agreement; (iii) Amendments to Financing Statements; (iv) a Supplemental 
Assignment of Lessor's Interest in Leases and Guarantees (the "Supplemental 
Assignment"); (v) a Certificate of Borrower and Guarantor; (vi) a 
Reaffirmation of CPI Guaranty; and (vii) a Reaffirmation of CRE Guaranty; and 
that (b) CPI execute and deliver (i) an Indemnity Deed of Trust, Assignment 
of Rents, and Security Agreement; (ii) an Indemnity Assignment of Rents; and 
(iii) Indemnity Financing Statements (collectively, together with any and all 
other documents evidencing or securing the modification, the "Modification 
Documents").

         G.  The Original Note and this Allonge are hereinafter sometimes 
collectively referred to as the "Note."  The Original Deed of Trust and the 
Supplemental Deed of Trust are hereinafter sometimes collectively referred to 
as the "Deed of Trust."  The Original CPI Guaranty and the Reaffirmation of 
CPI Guaranty are hereinafter sometimes collectively referred to as the "CPI 
Guaranty."  The Original CRE Guaranty and the Reaffirmation of CRE Guaranty 
are hereinafter sometimes collectively referred to as the "CRE Guaranty." The 
Original Assignment of Leases and the Supplemental Assignment are hereinafter 
sometimes collectively referred to as the "Assignment of Leases."  The 
Original Loan Documents and the Modification Documents are hereinafter 
sometimes collectively referred to as the "Loan Documents" and individually 
as a "Loan Document."

         NOW, THEREFORE, for and in consideration of the Recitals hereinabove 
set forth, which are incorporated into the body of this Allonge, the Bank's 
agreement to extend the maturity date of the Loan, CPI's agreement to grant 
to the Additional Collateral, and other good and valuable consideration, the 
receipt and adequacy of which are hereby acknowledged, the parties agree as 
follows:

         1.  Amendment of Original Note.  The provisions of the Original 
Note are hereby amended in the following manner:



                               Page 2 of 9 Pages





         1.1  Interest Rate.  The interest rate provisions of pages 3 through 
6 of the Original Note are deleted and the following is inserted as if 
originally set forth therein:

               FOR VALUE RECEIVED, the Borrower promises to pay to the order 
               of the Bank, at its principal office in Baltimore, Maryland, 
               or at such other place or to such other party as the holder 
               hereof may from time to time designate, the principal sum of 
               ELEVEN MILLION EIGHT HUNDRED THOUSAND AND 00/100 DOLLARS 
               ($11,800,000.00), with interest on the unpaid principal 
               balance from the date of this Note, until paid, at the rate of 
               one half percent (0.5%) per annum in excess of the Prime Rate 
               (as hereinafter defined).

         1.2  Prime Rate. The following is inserted as if originally set 
forth in the Original Note:

               Prime Rate. "Prime Rate" means the prime commercial lending 
               rate of the Bank as publicly announced to be in effect from 
               time to time.  The Prime Rate is not necessarily the lowest 
               rate of interest charged by the Bank for commercial or other 
               types of loans.  It is understood that the Prime Rate is only 
               one of the bases for computing interest on loans made by the 
               Bank and that by basing interest on the Prime Rate, the Bank 
               has not committed to charge and the Borrower has not in any 
               way bargained for interest based on a lower or the lowest rate 
               at which the Bank may now or in the future make loans to other 
               borrowers.  Any change in the rate of interest as a result of 
               a change in the Prime Rate shall be effective as of the date 
               of the change in the Prime Rate.

         1.3  Repayment and Maturity Date of Loan.  The first unnumbered 
paragraph on page 3 of the Original Note is deleted and the following is 
inserted as if originally set forth therein:

               The loan shall be repaid on a fifteen (15) year schedule of 
               one hundred seventy-nine (179) consecutive installments of 
               Sixty Five Thousand Nine Hundred Twenty One and 79/100 Dollars 
               ($65,921.79) in principal together with any and all accrued 
               interest


                              Page 3 of 9 Pages





               thereon commencing August 1, 1994, and continuing on the first 
               day of each month thereafter until June 1, 2009, and a payment 
               on July 1, 2009, at which time the entire unpaid balance of 
               principal and any accrued but unpaid interest, if not sooner 
               paid, shall be due and payable in full; provided, however, 
               that the entire unpaid principal and any accrued but unpaid 
               interest, if not sooner paid, shall be due and payable on July 
               1, 1999, or July 1, 2004, at the Bank's sole and absolute 
               discretion if the Bank provides the Borrower with written 
               notice no later than April 1, 1999, or April 1, 2004, as the 
               case may be, of its intention to call this Note (the "Call").  
               Any change in the rate of interest as a result of a change in 
               the Prime Rate shall be effective as of the date of the change 
               in the Prime Rate.

         1.4  Loan Extension Fee. The sixth full paragraph of the Original 
Note is deleted and the following is inserted as if originally set forth 
therein:

               Loan Extension Fee.  Borrower has paid to Bank a loan 
               extension fee in the amount of one half percent (0.5%) of the 
               principal amount of the Loan, or Fifty-Nine Thousand and 
               00/100 Dollars ($59,000.00)

         1.5  Notices.  This notice provision appearing on page 4 of the 
Original Note is deleted and the following is inserted as if originally set 
forth therein:

               Notices.  All notices, requests and demands upon the 
               prospective parties hereto shall be in writing and shall be 
               sent by hand delivery or Federal Express or other commercial 
               courier addressed as follows, or to such other address as the 
               respective party may designate by notice to the others:

      if to the Bank:              Mercantile-Safe Deposit and Trust
                                   Company
                                   2 Hopkins Plaza, Suite 200
                                   Baltimore, Maryland  21201
                                   Attn:  Nicholas C. Richardson
                                          Assistant Vice President


                              Page 4 of 9 Pages






     if to the Borrower:  Brown's Wharf Limited Partnership
                          c/o Constellation Real Estate, Inc.
                          8815 Centre Park Drive
                          Columbia, Maryland 21045
                          Attn:  General Counsel

     with copy to:        Constellation Real Estate Group, Inc.
                          250 West Pratt Street
                          Baltimore, Maryland 21201-2423
                          Attn: Corporate Secretary
                                Twenty-Third Floor

          All such notices shall be deemed to have been given one business 
day after the date on which the same was sent or upon receipt, which ever 
shall first occur.

     1.6  Default.  The Section of the Original Note, commencing at the 
second full paragraph on page 4 and continuing on carry-over paragraphs (c) 
and (d) on page 5 is hereby deleted and the following is inserted as if 
originally set forth therein:

          Default.

          The happening of any one or more of the following events shall 
          constitute an Event of Default under this Note:

          (a)  The Borrower fails to make any payment within five (5) days of 
          the date when due; or

          (b)  The Borrower fails to perform or comply with any other 
          covenant, term or condition of the Note, the Deed of Trust, or any 
          other Loan Document and such failure continues uncured for thirty 
          (30) days after written notice thereof from the Bank to the 
          Borrower; or

          (c)  An Event of Default (as defined therein) shall have occurred 
          and be continuing under the Deed of Trust, the CRE Guaranty, the 
          CPI Guaranty, the Loan Agreement, any of the Original Loan 
          Documents or any of the Modification Documents; or


                               Page 5 of 9 Pages





         (d)  Any representation or warranty made by the Borrower in this 
          Note proves to have been incorrect or misleading in any material 
          respect either on the date when made or on the date reaffirmed 
          pursuant to the terms of this Note; or

          (e)  The Borrower shall fail to pay the entire principal and 
          outstanding interest within five (5) days after due if the Bank 
          exercises the Call.

               It is expressly agreed that upon the happening of an Event of 
          Default hereunder or under any of the Loan Documents, the entire 
          unpaid balance of the principal sum due hereunder, plus all accrued 
          interest shall, at the option of the holder hereof, at once become 
          and be due and payable.

               Upon the occurrence of an Event of Default hereunder and if 
          this Note is collected by an attorney, the Borrower agrees to pay 
          all costs of collection, including reasonable and verifiable 
          attorney's fees.

     1.7  Mutual Waiver of Jury Trial.  The Original Note is amended by 
adding the following as if originally set forth therein:

          Mutual Waiver of Jury Trial.

          The holder of this Note and Borrower each, on behalf of itself and 
          its successors and assigns, waives to the fullest extent permitted 
          by law all right to trial by jury of any and all claims between 
          them arising under this Note, the Amended and Restated Deed of 
          Trust, the Loan Agreement, or any other documents and agreements 
          executed in connection, directly or indirectly, with this loan 
          transaction, and any and all claims arising under common law or 
          under any statute of any state or the United States of America, 
          whether any such claims be now existing or hereafter arising, now 
          known or unknown. In making this waiver, the holder of this Note 
          and Borrower acknowledge and agree that any and all claims made by 
          the holder of this Note against Borrower and all


                               Page 6 of 9 Pages





                   claims made by the Borrower against the holder of this 
                   Note shall be heard by a judge of a court of proper 
                   jurisdiction and shall not be heard by a jury.  The holder 
                   of this Note and Borrower acknowledge and agree that this 
                   waiver of trial by jury is a material element of the 
                   consideration for this transaction. The holder of this 
                   Note and Borrower, with advice of counsel, each 
                   acknowledges that it is knowingly and voluntarily waiving 
                   a legal right by agreeing to this waiver provision.

         2.   Outstanding Indebtedness.  As of July 1, 1994, the principal 
balance outstanding under the Loan is Eleven Million Eight Hundred Thousand 
and 00/100 Dollars ($11,800,000.00). Accrued and unpaid interest on the Loan 
through July 1, 1994 is Seventy-two thousand seven hundred thirty-nine 
dollars and 73 cents ($72,739.73), with interest accruing at the rate of 
$2424.66 per diem.

         3.   No Set-offs, etc.  The Borrower hereby acknowledges that as of 
the date hereof, the Borrower has no sets-offs, defenses, claims, or 
counterclaims against the Bank as pertains to (a) the Borrower's obligation 
to pay the indebtedness evidenced by the Note or (b) the enforcement of any 
of the other Original Loan Documents, or the Modification Documents. The 
Borrower further acknowledges that the Bank has promptly, properly and 
completely performed all obligations, if any, imposed on it by the Original 
Note and the Original Loan Documents.

         4.   Release.  The Borrower hereby releases, acquits, and forever 
discharges the Bank and its affiliates, officers, directors, attorneys, 
agents, employees and representatives from any and all claims, demands, 
suits, contracts, agreements, accounts, defenses, offsets against the Loan, 
and liabilities of any kind of character which the Borrower ever had, now 
has, or may hereafter have against the Bank, its affiliates, officers, 
directors, attorneys, agents, employees, and representatives arising prior to 
the date hereof; provided, however, that such release shall not include any 
claims arising from the gross negligence or misconduct of the Bank.

         5.   No Novation.  The Borrower and the Bank expressly agree that 
nothing contained in this Allonge shall in any way be construed as a 
substitution, replacement, or novation of the indebtedness evidenced by the 
Original Note and by this Allonge, which indebtedness shall remain in full 
force and effect as confirmed, modified, amended and restated herein. The 
Original Loan Documents and the Modification Documents


                              Page 7 of 9 Pages




remain in full force and effect and there exists no oral modification thereto.

         6.   Effect of this Allonge.  Except as expressly modified herein 
and in the Modification Documents, all other terms and conditions set forth 
in the Original Loan Documents are hereby ratified and confirmed and remain 
in full force and effect.

         7.   Attachment of Allonge to Original Note.  This Allonge is (a) 
being physically attached to the Original Note simultaneously with the entry 
into this Allonge by the parties hereto to evidence the modifications to the 
terms of the Original Note set forth herein, and (b) upon such attachment 
shall be deemed to be part of the Original Note, as fully and completely as 
if its provisions were set forth at length in the Note.

         8.   Effectiveness.  This Allonge shall become effective on, and 
only on, its execution and delivery by each party hereto.

         IN WITNESS WHEREOF, the Borrower and the Bank have executed and 
ensealed this Allonge, intending it to be a sealed instrument, the day and 
year first-above written.

WITNESS:                          BORROWER

                                  BROWN'S WHARF LIMITED PARTNERSHIP, a
                                  Maryland limited partnership

                                  By:  CPI BROWN'S WHARF, INC., a
                                       Maryland corporation, its
                                       general partner


/s/                               By:  /s/ Roger A. Waesche, Jr.    (SEAL)
- --------------                              -----------------------------
                                            Name:  Roger A. Waesche, Jr.
                                            Title: Vice President

                                  By:  CONSTELLATION PROPERTIES, Inc.,
                                       a Maryland corporation, its
                                       general partner

/s/                               By:  /s/ Roger A. Waesche, Jr.    (SEAL)
- --------------                              -----------------------------
                                            Name:  Roger A. Waesche, Jr.
                                            Title: Vice President


                                Page 8 of 9 Pages



                                       BANK
                                       ----

                                       MERCANTILE-SAFE DEPOSIT AND TRUST
                                       COMPANY, a Maryland banking
                                       corporation

/s/ Courtney G. Carpenter              By:  /s/ Nicholas C. Richardson   (SEAL)
- -------------------------                   -----------------------------
                                            Name:  Nicholas C. Richardson
                                            Title: Assistant Vice President










                              Page 9 of 9 Pages