Significant Transactions, Dispositions of Apartment Communities and Assets Held for Sale	3 Months Ended
Mar. 31, 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 three months ended March 31, 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. Subsequent to March 31, 2018, we entered into a transaction 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. The acquisition will be funded initially through taking title subject to $290.0 million of non-recourse property debt, issuance of $90.0 million in common OP Units valued in the transaction at their estimated net asset value per unit (approximately 1.7 million common OP Units), and payment of $65.0 million in cash. In accordance with GAAP, the portion of the purchase price attributed to the common OP Units issued will be valued at the closing price of Aimco’s common stock on the dates of issuance. On May 1, 2018, we completed the acquisition of four of the six apartment communities including 665 apartment homes and 153,000 square feet of office and retail space. We anticipate the acquisition of the fifth apartment community during the summer of 2018 and the acquisition of the final apartment community upon completion of construction, expected in the first half of 2019. Dispositions of Apartment Communities and Assets Held for Sale During the three months ended March 31, 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 three months ended March 31, 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. As of March 31, 2018, no apartment communities were classified as held for sale. In April 2018, we entered into a binding agreement to sell for $590.0 million our Asset Management business and four affordable communities included in our Real Estate portfolio. We expect to close this transaction during the third quarter of 2018. After payment of closing costs and repayment of property level debt encumbering the Hunters Point apartment communities, net proceeds are expected to be approximately $512.0 million.

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

Acquisition of Apartment Communities

During the three months ended March 31, 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.

Subsequent to March 31, 2018, we entered into a transaction 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. The acquisition will be funded initially through taking title subject to $290.0 million of non-recourse property debt, issuance of $90.0 million in common OP Units valued in the transaction at their estimated net asset value per unit (approximately 1.7 million common OP Units), and payment of $65.0 million in cash. In accordance with GAAP, the portion of the purchase price attributed to the common OP Units issued will be valued at the closing price of Aimco’s common stock on the dates of issuance.

On May 1, 2018, we completed the acquisition of four of the six apartment communities including 665 apartment homes and 153,000 square feet of office and retail space. We anticipate the acquisition of the fifth apartment community during the summer of 2018 and the acquisition of the final apartment community upon completion of construction, expected in the first half of 2019.

Dispositions of Apartment Communities and Assets Held for Sale

During the three months ended March 31, 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 three months ended March 31, 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. As of March 31, 2018, no apartment communities were classified as held for sale.

In April 2018, we entered into a binding agreement to sell for $590.0 million our Asset Management business and four affordable communities included in our Real Estate portfolio. We expect to close this transaction during the third quarter of 2018. After payment of closing costs and repayment of property level debt encumbering the Hunters Point apartment communities, net proceeds are expected to be approximately $512.0 million.