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Business (Details)
Dec. 31, 2010
Apartmentunit
Property
RealEstate
LandParcels
Property/Unit schedule 
Wholly Owned Properties425
Wholly Owned Units119,634
Partially Owned Consolidated Properties24
Partially Owned Consolidated Units5,232
Military Housing Properties2
Military Housing Units4,738
Total Properties451
Total Units129,604
Business (Textuals) [Abstract] 
EQR's Ownership percentage in ERPOP95.50%
Properties owned451
States in which properties owned are located17
Units owned129,604
Wholly Owned Properties425
Properties having 100% fee simple title422
Properties having less than 100% fee simple title1
Number of operating properties under long-term ground leases3
Number of land parcels under long-term ground leases1