Subsequent Events	9 Months Ended
Sep. 30, 2013
Subsequent Events [Abstract]
Subsequent Events [Text Block]	22. Subsequent Events On October 1, 2013, we sold a parcel of land known as Harlem Park located at 1800 Park Avenue (at 125th Street) in New York City for $66,000,000. The sale resulted in net proceeds of approximately $63,000,000 and a net gain of approximately $23,000,000. On October 4, 2013, we acquired a 92.5% interest in 655 Fifth Avenue, a 57,500 square foot retail and office property located at the northeast corner of Fifth Avenue and 52nd Street in Manhattan with 50 feet of frontage on Fifth Avenue, for $277,500,000 in cash. We consolidate the accounts of the property into our consolidated financial statements. On October 15, 2013, we acquired, for $194,000,000, land and air rights for 137,000 zoning square feet thereby completing the assemblage for our 220 Central Park South site in Manhattan.

Subsequent Events

9 Months Ended

Sep. 30, 2013

22. Subsequent Events

On October 1, 2013, we sold a parcel of land known as Harlem Park located at 1800 Park Avenue (at 125th Street) in New York City for $66,000,000. The sale resulted in net proceeds of approximately $63,000,000 and a net gain of approximately $23,000,000.

On October 4, 2013, we acquired a 92.5% interest in 655 Fifth Avenue, a 57,500 square foot retail and office property located at the northeast corner of Fifth Avenue and 52nd Street in Manhattan with 50 feet of frontage on Fifth Avenue, for $277,500,000 in cash. We consolidate the accounts of the property into our consolidated financial statements.

On October 15, 2013, we acquired, for $194,000,000, land and air rights for 137,000 zoning square feet thereby completing the assemblage for our 220 Central Park South site in Manhattan.