##### 



EXHIBIT 21

|                                                     |  |                       
|---------------------------------------------------- |  | ----------------------
|                                                     |  | State of Incorporation
|Subsidiary Name                                      |  | or Organization       
|                                                     |  |                       
|Archstone-Smith Communities LLC                      |  | Delaware              
|PTR-California Holdings (1) LLC                      |  | Delaware              
|PTR-California Holdings (2) LLC                      |  | Delaware              
|PTR-California Holdings (3) LLC                      |  | Delaware              
|SCP Utah Holdings 1 LLC                              |  | Delaware              
|SCP Utah Holdings 2 LLC                              |  | Delaware              
|ASN-SCP Utah Holdings 4 LLC                          |  | Delaware              
|ASN-SCP Utah Holdings 5 LLC                          |  | Delaware              
|PTR-Colorado (1), LLC                                |  | Colorado              
|Security Capital Atlantic Multifamily LLC            |  | Delaware              
|SCA-North Carolina (1) LLC                           |  | Delaware              
|SCA-North Carolina (2) LLC                           |  | Delaware              
|SCA-Tennessee (3) LLC                                |  | Delaware              
|SCA-Tennessee (4) LLC                                |  | Delaware              
|Atlantic-Tennessee Limited Partnership               |  | Delaware              
|SCA Florida Holdings (2) LLC                         |  | Delaware              
|SCA-I LLC                                            |  | Delaware              
|Atlantic Multifamily Limited                         |  | Delaware              
|Partnership-I                                        |  | Delaware              
|SCA North Carolina Limited Partnership               |  | Delaware              
|ASN Washington Holdings (1) LLC                      |  | Delaware              
|ASN RH Member LLC                                    |  | Delaware              
|ASN San Diego LLC                                    |  | Delaware              
|ASN Studio City LLC                                  |  | Delaware              
|ASN Massachusetts Holdings (1) LLC                   |  | Delaware              
|ASN Massachusetts Holdings (2) LLC                   |  | Delaware              
|ASN Massachusetts Holdings (3) LLC                   |  | Delaware              
|ASN Massachusetts Holdings (4) LLC                   |  | Delaware              
|ASN Massachusetts Holdings (5) LLC                   |  | Delaware              
|ASN Minnesota Holdings (1) LLC                       |  | Delaware              
|ASN Multifamily Limited Partnership                  |  | Delaware              
|Turtle Run at Coral Springs, L.L.C                   |  | Delaware              
|Archstone Communities Limited Partnership            |  | Delaware              
|Archstone Communities Limited Partnership II         |  | Delaware              
|ASN Dakota Ridge L.L.C                               |  | Delaware              
|ASN Pinnacle L.L.C                                   |  | Delaware              
|ASN Wendemere L.L.C                                  |  | Delaware              
|Archstone Management Services Incorporated           |  | Delaware              
|Archstone Management Services (Florida) Incorporated |  | Delaware              
|Archstone Vinnin Square LLC                          |  | Delaware              
|ASN Northgate, LLC                                   |  | Delaware              
|ASN Stone Ends, LLC                                  |  | Delaware              
|ASN Richardson Highlands LLC                         |  | Delaware              
|ASN Technologies, Inc.                               |  | Delaware              
|ASN Gresham Commons LLC                              |  | Delaware              
|ASN Sussex Commons LLC                               |  | Delaware              
|ASN Charles Daniels LLC                              |  | Delaware              
|ASN Saybrooke LLC                                    |  | Delaware              
|ASN Cambridge LLC                                    |  | Delaware              
|ASN Watertown LLC                                    |  | Delaware              
|ASN Park Place LLC                                   |  | Delaware              
|ASN Washington Boulevard LLC                         |  | Delaware              
|ASN West End Boulevard LLC                           |  | Delaware              
|SAL Holdings LLC                                     |  | Delaware              
|First Multifamily Properties LLC                     |  | Delaware              
|FMP GP LLC                                           |  | Delaware              





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##### 



|                                                      |  |                       
|----------------------------------------------------- |  | ----------------------
|                                                      |  | State of Incorporation
|Subsidiary Name                                       |  | or Organization       
|                                                      |  |                       
|FMP Limited Partnership                               |  | Delaware              
|Second Multifamily Properties LLC                     |  | Delaware              
|SMP GP LLC                                            |  | Delaware              
|SMP Limited Partnership                               |  | Delaware              
|Monadnock Property Trust, LLC                         |  | Delaware              
|Monadnock Texas LP                                    |  | Texas                 
|MP North Carolina GP Inc                              |  | Delaware              
|MP North Carolina LP                                  |  | Delaware              
|MP Texas GP LLC                                       |  | Delaware              
|Texas GP Properties LLC                               |  | Delaware              
|Casco Property Trust LLC                              |  | Delaware              
|Casco GP LLC                                          |  | Delaware              
|Casco TN LP                                           |  | Delaware              
|Casco TN GP Inc.                                      |  | Delaware              
|Casco Properties LP                                   |  | Delaware              
|Casco Dunwoody LLC                                    |  | Delaware              
|Katahdin Property Trust LLC                           |  | Delaware              
|Katahdin GP LLC                                       |  | Delaware              
|Katahdin Properties LP                                |  | Delaware              
|Archstone Financial Services LLC                      |  | Delaware              
|SafeRent LLC                                          |  | Delaware              
|Archstone Foundation (non-profit)                     |  | Delaware              
|Monterey Ranch Residential & Commercial Community     |  |                       
|Property Owners Association (non-profit)              |  | Texas                 
|NEC Tatum & Bell Owners Association                   |  | Arizona               
|Courthouse Hill L.L.C                                 |  | Delaware              
|Smith Property Holdings Springfield L.L.C             |  | Virginia              
|Smith Property Holdings 2000 Commonwealth L.L.C       |  | Delaware              
|Smith Property Holdings Crystal Plaza L.L.C           |  | Delaware              
|Smith Property Holdings Dearborn Place Manager L.L.C  |  | Delaware              
|Smith Property Holdings One East Delaware L.L.C       |  | Delaware              
|Smith Property Holdings Lincoln Towers L.L.C          |  | Virginia              
|Smith Property Holdings One L.P.                      |  | Delaware              
|Smith Property Holdings One (D.C.) L.P.               |  | Delaware              
|Smith Property Holdings Crystal Towers L.P.           |  | Delaware              
|Smith Property Holdings Two L.P.                      |  | Delaware              
|Smith Property Holdings Two (D.C.) L.P.               |  | Delaware              
|Smith Property Holdings Three L.P.                    |  | Delaware              
|Smith Property Holdings Three (D.C.) L.P.             |  | Delaware              
|Smith Property Holdings Four L.P.                     |  | Delaware              
|Smith Property Holdings Kenmore L.P.                  |  | Delaware              
|Smith Property Holdings Five L.P.                     |  | Delaware              
|Smith Property Holdings Five (D.C.) L.P.              |  | Delaware              
|First Herndon Associates L.P.                         |  | Delaware              
|Smith Property Holdings Six L.P.                      |  | Delaware              
|Smith Property Holdings Six (D.C.) L.P.               |  | Delaware              
|Smith Property Holdings Van Ness L.P.                 |  | Delaware              
|Smith Property Holdings Columbia Road, L.P.           |  | Delaware              
|Smith Property Holdings Seven L.P.                    |  | Delaware              
|Smith Property Holdings Cronins Landing L.P.         |  | Massachusetts         
|Smith Property Holdings 4411 Connecticut Avenue L.L.C |  | Delaware              
|Smith Property Holdings Buchanan House L.L.C          |  | Delaware              
|Smith Property Holdings McClurg Court L.L.C           |  | Delaware              
|Smith Property Holdings Parc Vista L.L.C              |  | Delaware              
|Smith Property Holdings Stonebridge L.L.C             |  | Delaware              
|SPH University Center L.L.C                           |  | Delaware              





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##### 



|                                                  |  |                       
|------------------------------------------------- |  | ----------------------
|                                                  |  | State of Incorporation
|Subsidiary Name                                   |  | or Organization       
|                                                  |  |                       
|Smith Property Holdings Superior Place L.L.C      |  | Delaware              
|Smith Property Holdings Water Park Towers L.L.C   |  | Delaware              
|Smith Property Holdings Renaissance Manager L.L.C |  | Delaware              
|SPH Renaissance, L.L.C                            |  | Delaware              
|Alban Towers L.L.C                                |  | Delaware              
|Smith Property Holdings Alban Towers L.L.C        |  | Delaware              
|Smith Property Holdings Alban Towers Two L.L.C    |  | Delaware              
|Smith Property Holdings Aventura A L.L.C          |  | Delaware              
|Smith Property Holdings Aventura B L.L.C          |  | Delaware              
|Smith Property Holdings Aventura C L.L.C          |  | Delaware              
|Smith Property Holdings Consulate L.L.C           |  | Delaware              
|Smith Property Holdings Countryside L.L.C         |  | Delaware              
|Smith Property Holdings Crystal Houses L.L.C      |  | Delaware              
|Smith Property Holdings Park West L.L.C           |  | Delaware              
|Smith Property Holdings Skyline Towers, L.L.C     |  | Delaware              
|Smith Property Holdings Somerset L.L.C            |  | Delaware              
|Smith Property Holdings South Beach Towers L.L.C  |  | Delaware              
|Smith Property Holdings Sunset Pointe Court L.L.C |  | Delaware              
|Smith Property Holdings Sunset Pointe III L.L.C   |  | Delaware              
|Smith Property Holdings Sunset Pointe North L.L.C |  | Delaware              
|Smith Property Holdings Sunset Pointe South L.L.C |  | Delaware              
|Smith Property Holdings Sunset Pointe West L.L.C  |  | Delaware              
|Smith Property Holdings Terrace L.L.C             |  | Delaware              
|Smith Property Holdings Delaware Place, L.P.      |  | Delaware              
|Smith Property Holdings Plaza 440 Manager L.L.C   |  | Delaware              
|Smith Property Holdings Concord L.L.C             |  | Delaware              
|Smith Property Holdings Harbour House L.L.C       |  | Delaware              
|Smith Property Holdings Illinois Center L.L.C     |  | Delaware              
|Smith Property Holdings New River L.L.C           |  | Delaware              
|Smith Property Holdings Reston Landing L.L.C      |  | Delaware              
|Smith Property Holdings Sagamore Towers, L.L.C    |  | Delaware              
|Smith Property Holdings Skyline Mall, L.L.C       |  | Virginia              
|Smith Property HoldingsSpringfield L.L.C          |  | Virginia              
|SPH Springfield Station L.L.C                     |  | Delaware              
|Smith Property Holdings Wilson L.L.C              |  | Delaware              
|Metropolitan Acquisition Finance L.P.             |  | Delaware              
|Smith Employment Services L.P.                    |  | Delaware              
|Charles E. Smith Insurance Agency, Inc.           |  | Washington, D.C.      
|Pollard Gardens I, L.L.C                          |  | Virginia              
|Miami Beach Properties L.L.C                      |  | Delaware              
|Smith Realty Company                              |  | Maryland              
|ASN SMCI LLC                                      |  | Delaware              
|Smith Management Construction, Inc.               |  | Maryland              
|AMERITON Holdings, LLC                            |  | Delaware              
|AMERITON Properties Incorporated                  |  | Maryland              
|Consolidated Engineering Services, Inc.           |  | Maryland