The Information Advantage

Real Estate Weekly, July 24, 2002

COSTAR GROUP

Market Watch The Information Advantage

                   Available space  Available space
                    removed from        added to
                      inventory        inventory

2 Week Period of         197              156
04/29/02-05/12/02      Blocks            Blocks
                      1,428,220        1,174,209
                     square feet      square feet

2 Week Period of         124              134
05/13/02-05/26/02      Blocks            Blocks
                       836,458         1,838,361
                     square feet      square feet

2 Week Period of         160              156
05/27/02-06/09/02      Blocks            Blocks
                      1,138,092        1,708,954
                     square feet      square feet

2 Week Period of         141              152
06/10/02-06/23/02      Blocks            Blocks
                      1,045,962        1,334,480
                     square feet      square feet

* Blocks represent the sum of single or multiple space additions and/or
deletions for a given building in Manhattan for the stated periods of
time.

FOR MORE INFORMATION, PLEASE CALL (917) 332-2100