================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  -------------

                                 SCHEDULE 13D/A
             INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
            TO RULE 13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO
                                   RULE 13d-2

                               (AMENDMENT NO. 20)

                         CarrAmerica Realty Corporation
                    (Formerly Named Carr Realty Corporation)

                                (Name of Issuer)

                          Common Stock, $.01 Par Value
       ------------------------------------------------------------------
                         (Title of Class of Securities)


                                   144418 10 0
--------------------------------------------------------------------------------
                                 (CUSIP Number)

                           Jeffrey A. Klopf, Secretary
                       Security Capital Group Incorporated
                               125 Lincoln Avenue
                           Santa Fe, New Mexico 87501
                                 (505) 982-9292
       ------------------------------------------------------------------
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)


                                December 14, 2001
       ------------------------------------------------------------------
                  (Date of Event Which Requires Filing of This
                                   Statement)


If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the following
box: [_].


                         (Continued on following pages)
                              (Page 1 of 12 Pages)
--==============================================================================





                                 SCHEDULE 13D
-----------------------------                          -------------------------
   CUSIP NO. 861907 10 3                                     Page 2 of 12
-----------------------------                          -------------------------


--------------------------------------------------------------------------------

1.    NAMES OF REPORTING PERSONS
            Security Capital Group Incorporated

      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
            36-3692698

--------------------------------------------------------------------------------

2.    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

                                                                     (a)   [_]

                                                                     (b)   [_]
------------------------------------------------------------------------------

3.    SEC USE ONLY

--------------------------------------------------------------------------------
4.    SOURCE OF FUNDS

      BK, OO
--------------------------------------------------------------------------------

5.    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
      PURSUANT TO ITEMS 2(d) OR 2(e)

                                                                           [_]
--------------------------------------------------------------------------------

6.    CITIZENSHIP OR PLACE OF ORGANIZATION

      Maryland
--------------------------------------------------------------------------------
  Number of       7.  SOLE VOTING POWER

   Shares             19,403,417
              ------------------------------------------------------------------
Beneficially      8.  SHARED VOTING POWER

  Owned By            -0-
              ------------------------------------------------------------------
    Each          9.  SOLE DISPOSITIVE POWER

  Reporting           19,403,417
              ------------------------------------------------------------------
 Person With      10.  SHARED DISPOSITIVE POWER

                      -0-
--------------------------------------------------------------------------------

11.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
      19,403,417
--------------------------------------------------------------------------------

12.   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES

                                                                           [_]
--------------------------------------------------------------------------------

13.   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
      37.4%

--------------------------------------------------------------------------------

14.   TYPE OF REPORTING PERSON REPORTING

      CO
--------------------------------------------------------------------------------





                                 SCHEDULE 13D
-----------------------------                          -------------------------
   CUSIP NO. 861907 10 3                                     Page 3 of 12
-----------------------------                          -------------------------


--------------------------------------------------------------------------------

1.    NAMES OF REPORTING PERSONS
            SC Capital Incorporated

      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
            74-2985638

--------------------------------------------------------------------------------

2.    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

                                                                     (a)   [_]

                                                                     (b)   [_]
------------------------------------------------------------------------------

3.    SEC USE ONLY

--------------------------------------------------------------------------------
4.    SOURCE OF FUNDS

      BK, OO
--------------------------------------------------------------------------------

5.    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
      PURSUANT TO ITEMS 2(d) OR 2(e)

                                                                           [_]
--------------------------------------------------------------------------------

6.    CITIZENSHIP OR PLACE OF ORGANIZATION

      Nevada
--------------------------------------------------------------------------------
  Number of       7.  SOLE VOTING POWER

   Shares             19,403,417
              ------------------------------------------------------------------
Beneficially      8.  SHARED VOTING POWER

  Owned By            -0-
              ------------------------------------------------------------------
    Each          9.  SOLE DISPOSITIVE POWER

  Reporting           19,403,417
              ------------------------------------------------------------------
 Person With      10.  SHARED DISPOSITIVE POWER

                      -0-
--------------------------------------------------------------------------------

11.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
      19,403,417
--------------------------------------------------------------------------------

12.   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES

                                                                           [_]
--------------------------------------------------------------------------------

13.   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
      37.4%

--------------------------------------------------------------------------------

14.   TYPE OF REPORTING PERSON REPORTING

      CO
--------------------------------------------------------------------------------





                                 SCHEDULE 13D
-----------------------------                          -------------------------
   CUSIP NO. 861907 10 3                                     Page 4 of 12
-----------------------------                          -------------------------


--------------------------------------------------------------------------------

1.    NAMES OF REPORTING PERSONS
            SC Realty Incorporated

      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
            88-0330184

--------------------------------------------------------------------------------

2.    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

                                                                     (a)   [_]

                                                                     (b)   [_]
------------------------------------------------------------------------------

3.    SEC USE ONLY

--------------------------------------------------------------------------------
4.    SOURCE OF FUNDS

      BK, OO
--------------------------------------------------------------------------------

5.    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
      PURSUANT TO ITEMS 2(d) OR 2(e)

                                                                           [_]
--------------------------------------------------------------------------------

6.    CITIZENSHIP OR PLACE OF ORGANIZATION

      Nevada
--------------------------------------------------------------------------------
  Number of       7.  SOLE VOTING POWER

   Shares             19,403,417
              ------------------------------------------------------------------
Beneficially      8.  SHARED VOTING POWER

  Owned By            -0-
              ------------------------------------------------------------------
    Each          9.  SOLE DISPOSITIVE POWER

  Reporting           19,403,417
              ------------------------------------------------------------------
 Person With      10.  SHARED DISPOSITIVE POWER

                      -0-
--------------------------------------------------------------------------------

11.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
      19,403,417
--------------------------------------------------------------------------------

12.   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES

                                                                           [_]
--------------------------------------------------------------------------------

13.   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
      37.4%

--------------------------------------------------------------------------------

14.   TYPE OF REPORTING PERSON REPORTING

      CO
--------------------------------------------------------------------------------





                                 SCHEDULE 13D
-----------------------------                          -------------------------
   CUSIP NO. 861907 10 3                                     Page 5 of 12
-----------------------------                          -------------------------


--------------------------------------------------------------------------------

1.    NAMES OF REPORTING PERSONS
            Security Capital Operations Incorporated

      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
            52-2146697

--------------------------------------------------------------------------------

2.    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

                                                                     (a)   [_]

                                                                     (b)   [_]
------------------------------------------------------------------------------

3.    SEC USE ONLY

--------------------------------------------------------------------------------
4.    SOURCE OF FUNDS

      BK, OO
--------------------------------------------------------------------------------

5.    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
      PURSUANT TO ITEMS 2(d) OR 2(e)

                                                                           [_]
--------------------------------------------------------------------------------

6.    CITIZENSHIP OR PLACE OF ORGANIZATION

      Maryland
--------------------------------------------------------------------------------
  Number of       7.  SOLE VOTING POWER

   Shares             19,403,417
              ------------------------------------------------------------------
Beneficially      8.  SHARED VOTING POWER

  Owned By            -0-
              ------------------------------------------------------------------
    Each          9.  SOLE DISPOSITIVE POWER

  Reporting           19,403,417
              ------------------------------------------------------------------
 Person With      10.  SHARED DISPOSITIVE POWER

                      -0-
--------------------------------------------------------------------------------

11.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
      19,403,417
--------------------------------------------------------------------------------

12.   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES

                                                                           [_]
--------------------------------------------------------------------------------

13.   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
      37.4%

--------------------------------------------------------------------------------

14.   TYPE OF REPORTING PERSON REPORTING

      CO
--------------------------------------------------------------------------------





                                 SCHEDULE 13D
-----------------------------                          -------------------------
   CUSIP NO. 861907 10 3                                     Page 6 of 12
-----------------------------                          -------------------------


--------------------------------------------------------------------------------

1.    NAMES OF REPORTING PERSONS
            Security Capital Office Business Trust (formerly East Mixed-Use
            Realty Investors Trust)

      I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
            74-2869172

--------------------------------------------------------------------------------

2.    CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP

                                                                     (a)   [_]

                                                                     (b)   [_]
------------------------------------------------------------------------------

3.    SEC USE ONLY

--------------------------------------------------------------------------------
4.    SOURCE OF FUNDS

      BK, OO
--------------------------------------------------------------------------------

5.    CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED
      PURSUANT TO ITEMS 2(d) OR 2(e)

                                                                           [_]
--------------------------------------------------------------------------------

6.    CITIZENSHIP OR PLACE OF ORGANIZATION

      Maryland
--------------------------------------------------------------------------------
  Number of       7.  SOLE VOTING POWER

   Shares             19,403,417
              ------------------------------------------------------------------
Beneficially      8.  SHARED VOTING POWER

  Owned By            -0-
              ------------------------------------------------------------------
    Each          9.  SOLE DISPOSITIVE POWER

  Reporting           19,403,417
              ------------------------------------------------------------------
 Person With      10.  SHARED DISPOSITIVE POWER

                      -0-
--------------------------------------------------------------------------------

11.   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
      19,403,417
--------------------------------------------------------------------------------

12.   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
      CERTAIN SHARES

                                                                           [_]
--------------------------------------------------------------------------------

13.   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
      37.4%

--------------------------------------------------------------------------------

14.   TYPE OF REPORTING PERSON REPORTING

      CO
--------------------------------------------------------------------------------





            This Amendment No. 20 is filed by Security Capital Group
Incorporated ("Security Capital Group"), a Maryland corporation, SC Realty
Incorporated, a Nevada corporation and an indirect wholly owned subsidiary of
Security Capital Group ("SC-Realty"), Security Capital Operations Incorporated,
a Maryland corporation and wholly owned subsidiary of SC-Realty ("Operations"),
and Security Capital Office Business Trust (formerly East Mixed-Use Realty
Investors Trust) a Maryland real estate investment trust and subsidiary of
Operations ("East"), and amends the Schedule 13D originally filed (as previously
amended, the "Schedule 13D") by Security Capital Group, SC-Realty and Security
Capital Holdings S.A. ("Holdings"), a corporation organized and existing under
the laws of Luxembourg and a wholly owned subsidiary of SC-Realty. This
Amendment No. 20 relates to shares of common stock, par value $0.01 per share
("Common Stock"), of CarrAmerica Realty Corporation, a Maryland corporation
formerly named Carr Realty Corporation ("Carr"). Capitalized terms used herein
without definition shall have the meanings ascribed thereto in the Schedule 13D.

Item 2. Identity and Background

Item 2 is hereby amended to add the following:

            As previously reported, Security Capital Group determined to dispose
of its shares of Common Stock in an underwritten public offering. On December
14, 2001, the terms of that offering were agreed, and Security Capital Group
entered into an underwriting agreement with the underwriters in the offering.
Pursuant to the underwriting agreement and as described in the prospectus
relating to the offering filed with the SEC on December 14, 2001, Security
Capital Group will sell 16,872,537 shares of Common Stock at $28.37 per share
(net of a $1.49 underwriting discount, $26.88 net to Security Capital Group).
Security Capital Group's sale of Common Stock pursuant to the offering is
expected to close on December 19, 2001.

             In addition, the underwriters have exercised an overallotment
option, pursuant to which they will purchase an additional 2,530,880 shares of
Common Stock held by Security Capital Group, all in accordance with the terms of
the underwriting agreement. The sale of these additional shares is also expected
to close on December 19, 2001. Upon successful completion of the offering, none
of the filing persons will own any shares of Common Stock. A copy of the press
release announcing the Offering is attached hereto as Exhibit 21 and is
incorporated herein by reference.

            Also on December 14, 2001, Security Capital Group entered into an
Agreement and Plan of Merger, dated as of December 14, 2001 (the "Merger
Agreement"), by and among Security Capital Group, General Electric Capital
Corporation ("GECC") and EB Acquisition Corp ("Merger Sub"), a copy of which is
attached hereto as Exhibit 22 and incorporated herein by reference. A copy of
the joint press release of Security Capital Group and GECC announcing the Merger
Agreement is attached hereto as Exhibit 23.

            Pursuant to the Merger Agreement and subject to the terms and
conditions contained therein, Merger Sub will merge with and into Security
Capital Group, (the "Merger") with Security Capital Group as the surviving
company, and Security Capital Group will become





an indirect wholly owned subsidiary of GECC. In the Merger, shares of Security
Capital Group Class B Common Stock, $.01 par value ("Class B shares") will be
converted into the right to receive consideration consisting of $26 in cash per
share, subject to the substitution therefor as described below and in the Merger
Agreement of a combination of cash and common shares of beneficial interest of
ProLogis Trust ("ProLogis Common Stock") with an agreed value of $26 per share
(the "Class B Consideration"), and shares of Security Capital Group Class A
Common Stock, $.01 par value ("Class A shares") will be converted into the right
to receive 50 times the Class B consideration (the "Class A Consideration").


            GECC may elect (but no later than the 15th day before the Security
Capital Group stockholder meeting to vote on the Merger and the Merger Agreement
(the "Group Stockholder Meeting")) to include the ProLogis Common Stock owned by
Security Capital Group as part of the Class A Consideration and the Class B
Consideration. If GECC so elects, the holders of Class B shares would receive
$26 in cash per share less the value of the ProLogis Common Stock received by
them (with the ProLogis Common Stock valued for such purposes based upon the
10-day trailing average price of the ProLogis Common Stock 2 days prior to the
Group Stockholder Meeting), and the holders of the Class A shares would receive
50 times such amount. GECC may also revoke any election it may make to include
the shares of ProLogis Common Stock as part of the Class A Consideration and
Class B Consideration, provided however that no such revocation may be made if
such revocation would make it reasonably necessary, based upon the advice of
Security Capital Group's independent counsel, to delay the Group Stockholder
Meeting.


            With the prior written consent of both Security Capital Group and
GECC, Security Capital Group may at any time sell any or all of its ProLogis
Common Stock, including to ProLogis Trust, pursuant to a public offering or
private placement, negotiated third-party purchase or otherwise (a "ProLogis
Sale"). In addition, Security Capital Group will, at the written request of
GECC, use its reasonable best efforts to effect a ProLogis Sale in the manner
requested by GECC, and subject to approval by GECC of any final pricing terms,
provided that Security Capital Group shall not be required to effect a ProLogis
Sale, or enter into any binding agreement to effect a ProLogis Sale, prior to
the date which is 18 days prior to the then-applicable date of the Group
Stockholders Meeting (provided that if a "road show" with respect to a ProLogis
Sale to be effected by a public offering shall have been commenced on or after
the date which is 22 days prior to the then-applicable date of the Group
Stockholders Meeting, and there shall thereafter be a delay or postponement of
the date of the Group Stockholders Meeting, the relevant date which is 18 days
prior to the previously-applicable date of the Group Stockholders Meeting shall
not be changed for purposes of these obligations). Security Capital Group will,
after consultation with GECC, determine the manager(s) and book runner(s) in the
event of any ProLogis Sale that is an underwritten offering.

            GECC may also determine to cause Security Capital Group to retain
its shares of ProLogis Common Stock, in which case, holders of Group Class B
shares will receive $26 in cash for their shares, and holders of Group Class A
shares 50 times such amount.





            Consummation of the Merger is subject to a number of conditions,
including the approval of the Merger Agreement by a majority of the voting power
of the outstanding stock of Security Capital Group, the absence of any
injunction or other government action preventing the merger, obtaining antitrust
and other required regulatory approvals, the effective registration of the
Prologis Common Stock, the accuracy of each parties' representations and
warranties and compliance with covenants, and the absence of a Material Adverse
Effect (as defined in the Merger Agreement) having occurred as to Security
Capital Group. There can be no assurance that any of these conditions will be
satisfied or waived or that even if satisfied or waived that the Merger will be
completed.

Item 4.  Purpose of the Transaction

Item 4 is hereby amended to add the following:

            Both prior to and following the Merger, Security Capital Group will
continue to be the beneficial owner of the Common Stock, and any action or
discussions taken in such connection will be subject to and conducted in
accordance with all applicable legal rules and contractual agreements to which
Security Capital Group is subject or which otherwise apply to the purchase or
sale of Common Stock or Security Capital Group's investment in Carr including,
without limitation, the relevant "standstill" provisions of the Stockholders
Agreement as previously described in this Schedule 13D and the Merger Agreement.
Nothing contained herein is intended to indicate any intent to act otherwise
than in accordance with such provisions and covenants, to modify any such
provisions or to encourage Carr or any other person to do so. Subject to these
requirements and limitations, however, Security Capital Group reserves all of
its rights with respect to its investment intent as previously described in this
Schedule 13D.

Item 5.  Interests in Securities of the Issuer

The information contained in Item 4 with respect to this Item is incorporated
herein by reference.



Item 7.  Material to be filed as Exhibits

Exhibit 21  Press Release of Security Capital Group dated December 14, 2001.

Exhibit 22  Agreement and Plan of Merger dated as of December 14, 2001, by
            and among Security Capital Group, GECC and Merger Sub (incorporated
            by reference to Exhibit 99.1 to Security Capital Group Current
            Report on Form 8-K, filed December 17, 2001).

Exhibit 23  Joint Press Release of Security Capital Group and GECC dated
            December 14, 2001 (incorporated by reference to Exhibit 99.2 to
            Security Capital Group Incorporated's Current Report on Form 8-K,
            filed December 17, 2001).





                                    SIGNATURE

            After reasonable inquiry and to the best of the undersigned's
knowledge and belief, the undersigned certifies that the information set forth
in this statement is true, complete and correct.



                                         SECURITY CAPITAL GROUP INCORPORATED


                                         By:  /s/ Jeffrey A. Klopf
                                             ---------------------------------
                                             Name:   Jeffrey A. Klopf
                                             Title:  Senior Vice President and
                                                     Secretary


                                         SC CAPITAL INCORPORATED


                                         By:  /s/ Jeffrey A. Klopf
                                             ---------------------------------
                                             Name:   Jeffrey A. Klopf
                                             Title:  Secretary


                                         SC REALTY INCORPORATED


                                         By:  /s/ Jeffrey A. Klopf
                                             ---------------------------------
                                             Name:   Jeffrey A. Klopf
                                             Title:  Secretary


                                         SECURITY CAPITAL OPERATIONS
                                         INCORPORATED


                                         By:  /s/ Jeffrey A. Klopf
                                             ---------------------------------
                                             Name:   Jeffrey A. Klopf
                                             Title:  Secretary






                                         SECURITY CAPITAL OFFICE BUSINESS TRUST


                                         By:  /s/ Jeffrey A. Klopf
                                             ---------------------------------
                                             Name:   Jeffrey A. Klopf
                                             Title:  Secretary


            December 17, 2001





                                  Exhibit Index


Exhibit 21            Press release of Security Capital Group Incorporated
                      dated December 14, 2001.

Exhibit 22            Agreement and Plan of Merger dated as of December 14,
                      2001, by and among Security Capital Group Incorporated,
                      General Electric Capital Corporation and EB Acquisition
                      Corp (incorporated by reference to Exhibit 99.1 to
                      Security Capital Group Incorporated's Current Report on
                      Form 8-K, filed December 17, 2001).

Exhibit 23            Joint Press Release of Security Capital Group
                      Incorporated and General Electric Capital Corporation
                      dated December 14, 2001 (incorporated by reference to
                      Exhibit 99.2 to Security Capital Group Incorporated's
                      Current Report on Form 8-K, filed December 17, 2001).