Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 30, 2021
Leases [Abstract]
Commitments and Contingencies	Commitments and Contingencies Lease Obligations The Company owns eight apartment communities and two commercial properties, located on land subject to ground leases expiring between July 2046 and March 2142. The Company has purchase options for all ground leases expiring prior to 2060. The ground leases for seven of the eight apartment communities and the rest of the ground leases are operating leases, with rental expense recognized on a straight-line basis over the lease term. In addition, the Company is party to 13 leases for its corporate and regional offices with varying terms through 2031, all of which are operating leases. During the three and nine months ended September 30, 2021, the Company exercised its purchase option under an operating lease, acquiring the land encumbered by the ground lease for Avalon Hackensack at Riverside for $10,336,000. As of September 30, 2021 and December 31, 2020, the Company had total operating lease assets of $126,699,000 and $133,581,000, respectively, and lease obligations of $154,790,000 and $161,313,000, respectively, reported as components of right of use lease assets and lease liabilities, respectively, on the accompanying Condensed Consolidated Balance Sheets. The Company incurred costs of $3,905,000 and $3,958,000 for the three months ended September 30, 2021 and 2020, respectively, and $11,628,000 and $12,115,000 for the nine months ended September 30, 2021 and 2020, respectively, related to operating leases. The Company has one apartment community located on land subject to a ground lease and three leases for portions of parking garages, adjacent to apartment communities, that are finance leases. As of September 30, 2021 and December 31, 2020, the Company had total finance lease assets of $25,616,000 and $21,685,000, respectively, and total finance lease obligations of $20,131,000 and $20,166,000, respectively, reported as components of right of use lease assets and lease liabilities, respectively, on the accompanying Condensed Consolidated Balance Sheets.
Commitments and Contingencies	Commitments and Contingencies Lease Obligations The Company owns eight apartment communities and two commercial properties, located on land subject to ground leases expiring between July 2046 and March 2142. The Company has purchase options for all ground leases expiring prior to 2060. The ground leases for seven of the eight apartment communities and the rest of the ground leases are operating leases, with rental expense recognized on a straight-line basis over the lease term. In addition, the Company is party to 13 leases for its corporate and regional offices with varying terms through 2031, all of which are operating leases. During the three and nine months ended September 30, 2021, the Company exercised its purchase option under an operating lease, acquiring the land encumbered by the ground lease for Avalon Hackensack at Riverside for $10,336,000. As of September 30, 2021 and December 31, 2020, the Company had total operating lease assets of $126,699,000 and $133,581,000, respectively, and lease obligations of $154,790,000 and $161,313,000, respectively, reported as components of right of use lease assets and lease liabilities, respectively, on the accompanying Condensed Consolidated Balance Sheets. The Company incurred costs of $3,905,000 and $3,958,000 for the three months ended September 30, 2021 and 2020, respectively, and $11,628,000 and $12,115,000 for the nine months ended September 30, 2021 and 2020, respectively, related to operating leases. The Company has one apartment community located on land subject to a ground lease and three leases for portions of parking garages, adjacent to apartment communities, that are finance leases. As of September 30, 2021 and December 31, 2020, the Company had total finance lease assets of $25,616,000 and $21,685,000, respectively, and total finance lease obligations of $20,131,000 and $20,166,000, respectively, reported as components of right of use lease assets and lease liabilities, respectively, on the accompanying Condensed Consolidated Balance Sheets.