##### 



Exhibit 21
 Company Name
    
    Jurisdiction7158 Willoughby, LLC
    
    DelawareAICP LLC
    
    DelawareAlban Towers, LLC
    
    District of ColumbiaArchstone Europe Trading B.V.
    
    NetherlandsAMERITON Properties Incorporated
    
    MarylandAPI Cameron Park LLC
    
    DelawareAPI Dadeland LLC
    
    DelawareAPI Emeryville Parkside
    
    DelawareAPI Emeryville Watertower LLC
    
    DelawareAPI Fox Plaza LLC
    
    DelawareAPI Hibiscus LLC
    
    DelawareAPI Laurel Crossing LLC
    
    DelawareAPI Manhattan Incorporated
    
    DelawareAPI Mission North LLC
    
    DelawareAPI Roosevelt Center Incorporated
    
    DelawareAPI Town Center South I LLC
    
    DelawareAPI Town Center South II LLC
    
    DelawareAPI Town Center South III LLC
    
    DelawareArchstone Builders Incorporated
    
    DelawareArchstone BV
    
    NetherlandsArchstone Deutsche RE Holding GmbH
    
    GermanyArchstone Deutsche RE Trading GmbH
    
    GermanyArchstone Foundation
    
    ColoradoArchstone Management Services Incorporated
    
    DelawareArchstone Property Management (California) Incorporated
    
    DelawareArchstone Property Management LLC
    
    DelawareArchstone Vinnin Square LLC
    
    DelawareArchstone-Smith Communities LLC
    
    DelawareArchstone-Smith Unitholder Services LLC
    
    DelawareASN 50th Street LLC
    
    DelawareASN Arbor Vista L.P.
    
    DelawareASN Aston LLC
    
    DelawareASN Bay Landing 1031 LLC
    
    DelawareASN Bay Landing LLC
    
    Delaware




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##### 



Company Name
    
    JurisdictionASN Bay Meadows I LLC
    
    DelawareASN Bay Meadows II LLC
    
    DelawareASN Bell Lakes LLC
    
    DelawareASN Bellevue LLC
    
    DelawareASN Bowie LLC
    
    DelawareASN Brooklyn Heights LLC
    
    DelawareASN Calabasas I LLC
    
    DelawareASN Calabasas II LLC
    
    DelawareASN Chicago LLC
    
    DelawareASN City Place LLC
    
    DelawareASN Clinton Green Member LLC
    
    DelawareASN Dulles LLC
    
    DelawareASN Dupont Circle LLC
    
    DelawareASN Estancia LLC
    
    DelawareASN Europe Trading Incorporated
    
    DelawareASN Europe Trading U.S. Incorporated
    
    DelawareASN Fairfax Corner LLC
    
    DelawareASN Foundry LLC
    
    DelawareASN Fox Plaza LLC
    
    DelawareASN Fremont LLC
    
    DelawareASN Gaithersburg LLC
    
    DelawareASN Hoboken I LLC
    
    DelawareASN Hoboken II LLC
    
    DelawareASN Holdings LLC
    
    DelawareASN Kendall Square LLC
    
    DelawareASN Key West LLC
    
    DelawareASN LaJolla LLC
    
    DelawareASN Lake Mendota Investments LLC
    
    DelawareASN Lakeshore East LLC
    
    DelawareASN Las Flores LLC
    
    DelawareASN Long Beach LLC
    
    DelawareASN Los Feliz LLC
    
    DelawareASN Maple Leaf (Office) LLC
    
    DelawareASN Maple Leaf Member LLC
    
    DelawareASN Marina Del Rey LLC
    
    DelawareASN Marina LLC
    
    Delaware




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##### 



Company Name
    
    JurisdictionASN Meadow Wood LLC
    
    DelawareASN Mission Center LLC
    
    DelawareASN Mission Gorge LLC
    
    DelawareASN Mountain View LLC
    
    DelawareASN Multifamily Limited Partnership
    
    DelawareASN Murray Hill LLC
    
    DelawareASN Northgate LLC
    
    DelawareASN Park Essex LC
    
    DelawareASN Pasadena LLC
    
    DelawareASN Placentia Place LLC
    
    DelawareASN Portofino LLC
    
    DelawareASN Presidio View LLC
    
    DelawareASN Quarry Hills 1031 LLC
    
    DelawareASN Quarry Hills LLC
    
    DelawareASN Reading LLC
    
    DelawareASN Redmond LLC
    
    DelawareASN Redmond Park LLC
    
    DelawareASN RH Member LLC
    
    DelawareASN Richardson Highlands LLC
    
    DelawareASN Rockville LLC
    
    DelawareASN Rolling Hills Manager LLC
    
    DelawareASN Roosevelt Center LLC
    
    DelawareASN San Diego LLC
    
    DelawareASN San Jose LLC
    
    DelawareASN Santa Monica LLC
    
    DelawareASN Seattle LLC
    
    DelawareASN Sonoma LLC
    
    DelawareASN StoneRidge LLC
    
    DelawareASN StoneRidge Manager LLC
    
    DelawareASN Studio City LLC
    
    DelawareASN Summit LLC
    
    DelawareASN Sunset LLC
    
    DelawareASN Symphony Place LLC
    
    DelawareASN Tanforan Crossing I LLC
    
    DelawareASN Tanforan Crossing II LLC
    
    DelawareASN Technologies, Inc.
    
    Delaware




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##### 



Company Name
    
    JurisdictionASN Texas GP LLC
    
    DelawareASN Thousand Oaks Plaza LLC
    
    DelawareASN Ventura LLC
    
    DelawareASN Virginia Holdings LLC
    
    DelawareASN Walnut Creek LLC
    
    DelawareASN Warner Center LLC
    
    DelawareASN Washington Boulevard LLC
    
    DelawareASN Watertown LLC
    
    DelawareASN West End LLC
    
    DelawareASN Westmont LLC
    
    DelawareASN Wisconsin Place (Residential) LLC
    
    DelawareASN Wisconsin Place (Retail ) LLC
    
    DelawareASN Woodland Hills East LLC
    
    DelawareASN Worthington Place LLC
    
    DelawareASN-Massachusetts Holdings (1) LLC
    
    DelawareASN-Massachusetts Holdings (2) LLC
    
    DelawareASN-Massachusetts Holdings (3) LLC
    
    DelawareASN-Massachusetts Holdings (4) LLC
    
    DelawareASN-Massachusetts Holdings (5) LLC
    
    DelawareASN-Washington Holdings (1) LLC
    
    DelawareBrandywine Apartments of Maryland, LLC
    
    MarylandCapital Mezz LLC
    
    DelawareCasco Dunwoody LLC
    
    DelawareCasco GP LLC
    
    DelawareCasco Properties LP
    
    DelawareCasco Property Trust LLC
    
    DelawareCasco Thornbury Bay LLC
    
    DelawareChateau Marina LLC
    
    DelawareCourthouse Hill LLC
    
    DelawareDetroit Village LLC
    
    DelawareElk Sierra LLC
    
    DelawareFiji Villas, LLC
    
    DelawareFirst Herndon Associates Limited Partnership
    
    DelawareGolden State Mezz LLC
    
    DelawareKatahdin GP LLC
    
    DelawareKatahdin Properties LP
    
    Delaware




---



##### 



Company Name
    
    JurisdictionKatahdin Property Trust LLC
    
    DelawareLa Brea Gateway LLC
    
    DelawareLake Mendota Investments LLC
    
    DelawareLMI Cheshire Bridge LLC
    
    DelawareLMI Pembroke Landings LLC
    
    DelawareLMI Preston Park LLC
    
    DelawareLMI Riverbend LLC
    
    DelawareLMI Rosemont LLC
    
    DelawareLMI Windward Park LLC
    
    DelawareMetropolitan Acquisition Finance LP
    
    DelawareMonadnock Harbour Cove LLC
    
    DelawareMonadnock Property Trust, LLC
    
    DelawareMonadnock Texas LP
    
    TexasMonterey Ranch Residential & Commercial Community Property Owners Association Inc.
    
    TexasMuseum Gardens LLC
    
    DelawareNorthblock Lofts, LLC
    
    DelawareOakwood Las Colinas L.P.
    
    DelawareOEC Holdings, LLC
    
    DelawareThe Lakes Holdings, LLC
    
    DelawarePanorama Insurance Ltd.
    
    BermudaProspector Diversified Assets LLC
    
    DelawarePTR  California Holdings (1) LLC
    
    DelawarePTR  California Holdings (3) LLC
    
    DelawarePTR  Colorado (1) LLC
    
    ColoradoR&B Realty Group II, LLC
    
    DelawareRPG Orange, LLC
    
    DelawareSCA-North Carolina (1) LLC
    
    DelawareSCA-North Carolina (2) LLC
    
    DelawareSmith Property Holdings 2000 Commonwealth L.L.C.
    
    DelawareSmith Property Holdings 4411 Connecticut Avenue LLC
    
    DelawareSmith Property Holdings Alban Towers L.L.C.
    
    DelawareSmith Property Holdings Alban Towers Two L.L.C.
    
    DelawareSmith Property Holdings Ballston Place L.L.C.
    
    DelawareSmith Property Holdings Buchanan House LLC
    
    DelawareSmith Property Holdings Columbia Road L.P.
    
    Delaware




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##### 



Company Name
    
    JurisdictionSmith Property Holdings Consulate LLC
    
    DelawareSmith Property Holdings Cronins Landing L.P.
    
    MassachusettsSmith Property Holdings Crystal Houses LLC
    
    DelawareSmith Property Holdings Crystal Plaza LLC
    
    DelawareSmith Property Holdings Crystal Towers L.P.
    
    DelawareSmith Property Holdings Five (D.C.) L.P.
    
    DelawareSmith Property Holdings Five L.P.
    
    DelawareSmith Property Holdings Four L.P.
    
    DelawareSmith Property Holdings Kenmore L.P.
    
    DelawareSmith Property Holdings Lincoln Towers LLC
    
    DelawareSmith Property Holdings One (D.C.) L.P.
    
    DelawareSmith Property Holdings One L.P.
    
    DelawareSmith Property Holdings Parc Vista LLC
    
    DelawareSmith Property Holdings Reston Landing LLC
    
    DelawareSmith Property Holdings Sagamore Towers LLC
    
    DelawareSmith Property Holdings Seven L.P.
    
    VirginiaSmith Property Holdings Six (D.C.) L.P.
    
    DelawareSmith Property Holdings Six L.P.
    
    DelawareSmith Property Holdings Springfield LLC
    
    DelawareSmith Property Holdings Superior Place LLC
    
    DelawareSmith Property Holdings Three (D.C.) L.P.
    
    DelawareSmith Property Holdings Three L.P.
    
    DelawareSmith Property Holdings Two (D.C.) L.P.
    
    DelawareSmith Property Holdings Two L.P.
    
    DelawareSmith Property Holdings Van Ness L.P.
    
    DelawareSmith Property Holdings Water Park Towers LLC
    
    DelawareSmith Property Holdings Wilson LLC
    
    DelawareSmith Realty Company
    
    MarylandSPH Springfield Station L.L.C.
    
    DelawareSquare 673 Apartments LLC
    
    DelawareTexas GP Properties LLC
    
    DelawareTRG-Pembroke Road, LLC
    
    FloridaWarner Pointe, LLC
    
    DelawareWestminster Estates, LLC
    
    TexasWisconsin Place Residential LLC
    
    Delaware