##### 



EXHIBIT 21 State ofIncorporation orSubsidiary Name
    
    Organization1841 Columbia Road Custodian LLC
    
    Delaware1841 Columbia Road LLC
    
    DelawareAICP LLC
    
    DelawareAircond Corporation
    
    DelawareAlban Towers, L.L.C.
    
    DelawareAMERITON Properties Incorporated
    
    MarylandAPI Barrington Hills, LLC
    
    DelawareAPI Chauncey Ranch LLC
    
    DelawareAPI Columbia Town Center LLC
    
    DelawareAPI CTC LLC
    
    DelawareAPI Genesis Park LLC
    
    DelawareAPI Hibiscus LLC
    
    DelawareAPI Jefferson Park LLC
    
    DelawareAPI Methuen LLC
    
    DelawareAPI Mission North LLC
    
    DelawareAPI Multifamily Properties I LLC
    
    DelawareAPI Verandahs B LLC
    
    DelawareAPI Verandahs GP1 LLC
    
    DelawareAPI Verandahs GP2 LLC
    
    DelawareArchstone Financial Services LLC
    
    DelawareArchstone Foundation
    
    ColoradoArchstone Management Services Incorporated
    
    DelawareArchstone Property Investment Incorporated
    
    DelawareArchstone Property Investment LLC
    
    DelawareArchstone Property Management (California) Incorporated
    
    DelawareArchstone Property Management LLC
    
    DelawareArchstone Vinnin Square LLC
    
    DelawareArchstone-Smith Communities LLC
    
    DelawareASN Bowie LLC
    
    DelawareASN Calabasas I LLC
    
    DelawareASN Calabasas II LLC
    
    DelawareASN Cambridge LLC
    
    DelawareASN Charles Daniels LLC
    
    DelawareASN Cypress Cove LLC
    
    DelawareASN Esplanade at Park Center LLC
    
    DelawareASN Estancia LLC
    
    DelawareASN Fairfax Corner LLC
    
    DelawareASN Gresham Commons LLC
    
    DelawareASN Lakeshore East LLC (fka SPH Lakeshore East LLC)
    
    DelawareASN Las Flores LLC
    
    DelawareASN Maple Leaf (Office) LLC
    
    DelawareASN Maple Leaf Member LLC
    
    DelawareASN Marina Del Rey LLC
    
    DelawareASN Meadow Wood LLC
    
    DelawareASN Miramar Lakes LLC
    
    DelawareASN Multifamily Limited Partnership
    
    DelawareASN Newport Crossing LLC
    
    DelawareASN Northgate LLC
    
    DelawareASN P&M Realty LLC
    
    DelawareASN Park Essex LLC
    
    DelawareASN Park Place LLC
    
    DelawareASN Presidio View LLC
    
    DelawareASN RH Member LLC
    
    DelawareASN Richardson Highlands LLC
    
    DelawareASN Rockville LLC
    
    DelawareASN Roosevelt Center LLC
    
    DelawareASN Santa Monica LLC
    
    Delaware
 92




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##### 



State ofIncorporation orSubsidiary Name
    
    OrganizationASN Saybrooke LLC
    
    DelawareASN Sonoma LLC
    
    DelawareASN StoneRidge LLC
    
    DelawareASN StoneRidge Manager LLC
    
    DelawareASN Studio City LLC
    
    DelawareASN Sussex Commons LLC
    
    DelawareASN Technologies, Inc.
    
    DelawareASN Ventura LLC
    
    DelawareASN Villa Redondo LLC
    
    DelawareASN Warner Center LLC
    
    DelawareASN Washington Boulevard LLC
    
    DelawareASN Watertown LLC
    
    DelawareASN West End LLC
    
    DelawareASN-Dakota Ridge, 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-Pinnacle LLC
    
    DelawareASN-SAL Holdings LLC
    
    DelawareASN-San Diego LLC
    
    DelawareASN-SCP Utah Holdings 4 LLC
    
    DelawareASN-SCP Utah Holdings 5 LLC
    
    DelawareASN-Washington Holdings (1) LLC
    
    DelawareASN-Wendemere, LLC
    
    DelawareBoca East LLC
    
    DelawareBrandywine Apartments of Maryland, LLC
    
    DelawareBriar Meadows Apartments LLC
    
    DelawareCasco Dunwoody LLC
    
    DelawareCasco GP LLC
    
    DelawareCasco Properties LP
    
    DelawareCasco Property Trust LLC
    
    DelawareCasco TN GP Inc.
    
    DelawareCasco TN LP
    
    DelawareCourthouse Hill L.L.C.
    
    DelawareDearborn/Delaware Associates L.P.
    
    DelawareFirst Herndon Associates L.P.
    
    DelawareFirst Multifamily Properties LLC
    
    DelawareHeather Ridge Apartments Business Trust
    
    MarylandHeather Ridge Apartments Incorporated
    
    MarylandInterlocken Apartments, LLC
    
    DelawareKatahdin GP LLC
    
    DelawareKatahdin Properties LP
    
    DelawareKatahdin Property Trust LLC
    
    DelawareKentlands Village Apartments LLC (Business Trust??)
    
    DelawareLas Palmas, L.L.C.
    
    DelawareMetropolitan Acquisition Finance L.P.
    
    DelawareMilestone Apartments Business Trust
    
    MarylandMIV (1) LLC
    
    DelawareMIV (2) LLC
    
    DelawareMonadnock Property Trust, LLC
    
    DelawareMonadnock Texas LP
    
    TexasMonterey Ranch Residential and Commercial Community Property Owners Association, Inc.
    
    TexasMP North Carolina GP Inc.
    
    DelawareMP North Carolina LP
    
    DelawareMt. San Cierra L.L.C.
    
    Arizona
 93




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##### 



State ofIncorporation orSubsidiary Name
    
    OrganizationNEC Tatum & Bell Owners Association, Inc.
    
    ArizonaPanorama Insurance Ltd.
    
    DelawarePollard Gardens I L.L.C.
    
    VirginiaPTR-California Holdings (1) LLC
    
    DelawarePTR-California Holdings (3) LLC
    
    DelawarePTR-Colorado (1), LLC
    
    ColoradoRenaissance Manager, LLC
    
    DelawareRosedale Commons, LLC
    
    DelawareSaddle Rock Apartments LLC
    
    DelawareSCA Florida Holdings (2) LLC
    
    DelawareSCA North Carolina Limited Partnership
    
    DelawareSCA-North Carolina (1) LLC
    
    DelawareSCA-North Carolina (2) LLC
    
    DelawareSecond Multifamily Properties Limited Partnership
    
    DelawareSecond Multifamily Properties LLC
    
    DelawareSecurity Capital Atlantic Multifamily LLC
    
    DelawareSienna Project LLC
    
    DelawareSmith Employment Service L.P.
    
    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 Aventura A L.L.C.
    
    DelawareSmith Property Holdings Aventura B L.L.C.
    
    DelawareSmith Property Holdings Aventura C L.L.C.
    
    DelawareSmith Property Holdings Ballston Place LLC
    
    DelawareSmith Property Holdings Buchanan House L.L.C.
    
    DelawareSmith Property Holdings Columbia Road L.P.
    
    DelawareSmith Property Holdings Concord L.L.C.
    
    DelawareSmith Property Holdings Consulate L.L.C.
    
    DelawareSmith Property Holdings Cronins Landing L.P.
    
    MassachusettsSmith Property Holdings Crystal Houses L.L.C.
    
    DelawareSmith Property Holdings Crystal Plaza L.L.C.
    
    DelawareSmith Property Holdings Crystal Towers L.P.
    
    DelawareSmith Property Holdings Dearborn Place Manager L.L.C.
    
    DelawareSmith Property Holdings Five (D.C.) L.P.
    
    DelawareSmith Property Holdings Five L.P.
    
    DelawareSmith Property Holdings Four L.P.
    
    DelawareSmith Property Holdings Harbor House L.L.C.
    
    DelawareSmith Property Holdings Harbour House South, LLC
    
    DelawareSmith Property Holdings Illinois Center L.L.C.
    
    DelawareSmith Property Holdings Kenmore L.P.
    
    DelawareSmith Property Holdings Lakeshore East LLC (a.k.a. ASN Lakeshore East LLC)
    
    DelawareSmith Property Holdings Lincoln Towers L.L.C.
    
    VirginiaSmith Property Holdings McClurg Court L.L.C.
    
    DelawareSmith Property Holdings New River L.L.C.
    
    DelawareSmith Property Holdings One (D.C.) L.P.
    
    DelawareSmith Property Holdings One East Delaware L.L.C.
    
    DelawareSmith Property Holdings One L.P.
    
    DelawareSmith Property Holdings Parc Vista L.L.C.
    
    DelawareSmith Property Holdings Plaza 440 LLC
    
    DelawareSmith Property Holdings Plaza 440 Manager L.L.C.
    
    DelawareSmith Property Holdings Reston Landing L.L.C.
    
    DelawareSmith Property Holdings Sagamore Towers L.L.C.
    
    DelawareSmith Property Holdings Seven L.P.
    
    DelawareSmith Property Holdings Six (D.C.) L.P.
    
    DelawareSmith Property Holdings Six L.P.
    
    Delaware
 94




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##### 



State ofIncorporation orSubsidiary Name
    
    OrganizationSmith Property Holdings South Beach Towers L.L.C.
    
    DelawareSmith Property Holdings Springfield L.L.C.
    
    DelawareSmith Property Holdings Sunset Pointe 3 L.L.C.
    
    DelawareSmith Property Holdings Sunset Pointe Court L.L.C.
    
    DelawareSmith Property Holdings Sunset Pointe North L.L.C.
    
    DelawareSmith Property Holdings Sunset Pointe South L.L.C.
    
    DelawareSmith Property Holdings Sunset Pointe West L.L.C.
    
    DelawareSmith Property Holdings Superior Place L.L.C.
    
    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 L.L.C.
    
    DelawareSmith Property Holdings Wilson L.L.C.
    
    DelawareSmith Realty Company
    
    MarylandSMP GP LLC
    
    DelawareSPH Springfield Station L.L.C.
    
    DelawareTechnology Value Partners
    
    ColoradoTewksbury Apartments LLC
    
    DelawareTexas GP Properties LLC
    
    DelawareThe 1841 Columbia Road Revocable Grantor Trust
    
    DelawareTurtle Run at Coral Springs L.L.C.
    
    DelawareVan Dorn Apartments LLC
    
    DelawareWestminster Estates, LLC
    
    Delaware
 95