Significant Transactions, Dispositions of Apartment Communities and Assets Held for Sale	6 Months Ended
Jun. 30, 2018
Discontinued Operations and Disposal Groups [Abstract]
Disposals and Other Significant Transactions	Significant Transactions, Dispositions of Apartment Communities and Assets Held for Sale Acquisition of Apartment Communities During the six months ended June 30, 2018, we purchased for $160.0 million Bent Tree Apartments, a 748-apartment home community in Fairfax County, Virginia. The purchase price, plus $1.0 million of capitalized transaction costs, was allocated as follows: $47.0 million to land; $113.0 million to buildings and improvements; and $1.0 million to other items. During the six months ended June 30, 2018, we agreed to acquire six apartment communities in the Philadelphia area for a stated purchase price of $445.0 million. The portfolio includes 1,006 existing apartment homes, 110 apartment homes under construction, and 185,000 square feet of office and retail space. On May 1, 2018, we purchased four of the six apartment communities, including 665 apartment homes and 153,000 square feet of office and retail space. The gross purchase price consisted of $208.9 million of assumed property-level debt and the issuance of 1.2 million OP Units. In accordance with GAAP, the OP Units were valued at $41.08 per unit, the closing price of Aimco’s common share on May 1, 2018. Total consideration, plus $6.4 million of capitalized transaction costs, was allocated as follows: $14.1 million to land; $282.5 million to buildings and improvements; $6.3 million to intangible assets; and $3.1 million to intangible liabilities. The purchase of the fifth apartment community is conditioned upon the City of Camden’s approval of the transfer of the existing PILOT tax agreement, which has not yet been received. The purchase of the sixth apartment community is expected upon completion of the construction in the first half of 2019. Dispositions of Apartment Communities and Assets Held for Sale During the six months ended June 30, 2018, we sold three apartment communities with 513 apartment homes for a gain on disposition of $50.6 million, net of income tax, and gross proceeds of $71.9 million resulting in $64.6 million in net proceeds to us. Two of these communities are located in southern Virginia and one is located in suburban Maryland. During the six months ended June 30, 2018, we sold our interests in the entities owning the La Jolla Cove property in settlement of legal actions filed in 2014 by a group of disappointed buyers who had hoped to acquire the property. We provided seller financing with a stated value of $48.6 million and received net cash proceeds of approximately $5.0 million in the sale. In addition to the apartment communities we sold during the periods presented, from time to time we may be marketing for sale certain apartment communities that are inconsistent with our long-term investment strategy. At the end of each reporting period, we evaluate whether such communities meet the criteria to be classified as held for sale. On July 25, 2018, we sold for $590.0 million our Asset Management business and our four affordable apartment communities located in Hunters Point. After payment of transaction costs and repayment of property-level debt encumbering the Hunters Point apartment communities, net proceeds were approximately $512.0 million. The related assets and liabilities were classified as held for sale as of June 30, 2018. As of June 30, 2018, we also classified Chestnut Hill Village, an 821-apartment home community located in north Philadelphia, as held for sale. On July 27, 2018, we sold this community for gross proceeds of $170.4 million, resulting in $165.5 million of net proceeds to us.

Significant Transactions, Dispositions of Apartment Communities and Assets Held for Sale

Acquisition of Apartment Communities

During the six months ended June 30, 2018, we purchased for $160.0 million Bent Tree Apartments, a 748-apartment home community in Fairfax County, Virginia. The purchase price, plus $1.0 million of capitalized transaction costs, was allocated as follows: $47.0 million to land; $113.0 million to buildings and improvements; and $1.0 million to other items.

During the six months ended June 30, 2018, we agreed to acquire six apartment communities in the Philadelphia area for a stated purchase price of $445.0 million. The portfolio includes 1,006 existing apartment homes, 110 apartment homes under construction, and 185,000 square feet of office and retail space. On May 1, 2018, we purchased four of the six apartment communities, including 665 apartment homes and 153,000 square feet of office and retail space. The gross purchase price consisted of $208.9 million of assumed property-level debt and the issuance of 1.2 million OP Units. In accordance with GAAP, the OP Units were valued at $41.08 per unit, the closing price of Aimco’s common share on May 1, 2018. Total consideration, plus $6.4 million of capitalized transaction costs, was allocated as follows: $14.1 million to land; $282.5 million to buildings and improvements; $6.3 million to intangible assets; and $3.1 million to intangible liabilities. The purchase of the fifth apartment community is conditioned upon the City of Camden’s approval of the transfer of the existing PILOT tax agreement, which has not yet been received. The purchase of the sixth apartment community is expected upon completion of the construction in the first half of 2019.

Dispositions of Apartment Communities and Assets Held for Sale

During the six months ended June 30, 2018, we sold three apartment communities with 513 apartment homes for a gain on disposition of $50.6 million, net of income tax, and gross proceeds of $71.9 million resulting in $64.6 million in net proceeds to us. Two of these communities are located in southern Virginia and one is located in suburban Maryland.

During the six months ended June 30, 2018, we sold our interests in the entities owning the La Jolla Cove property in settlement of legal actions filed in 2014 by a group of disappointed buyers who had hoped to acquire the property. We provided seller financing with a stated value of $48.6 million and received net cash proceeds of approximately $5.0 million in the sale.

In addition to the apartment communities we sold during the periods presented, from time to time we may be marketing for sale certain apartment communities that are inconsistent with our long-term investment strategy. At the end of each reporting period, we evaluate whether such communities meet the criteria to be classified as held for sale.

On July 25, 2018, we sold for $590.0 million our Asset Management business and our four affordable apartment communities located in Hunters Point. After payment of transaction costs and repayment of property-level debt encumbering the Hunters Point apartment communities, net proceeds were approximately $512.0 million. The related assets and liabilities were classified as held for sale as of June 30, 2018.

As of June 30, 2018, we also classified Chestnut Hill Village, an 821-apartment home community located in north Philadelphia, as held for sale. On July 27, 2018, we sold this community for gross proceeds of $170.4 million, resulting in $165.5 million of net proceeds to us.