Apartment Investment and Management Co. or Aimco (NYSE: AIV), a Denver-based real estate investment trust and the largest owner and operator of apartment communities in the United States, closed on its purchase of five contiguous apartment properties on Manhattan's Upper East Side last month. The acquired properties at 167-173 E. 90th St., between Lexington and 3rd avenues, consist of five walk-up buildings containing 72 one- and two-bedroom duplex apartments. Aimco purchased 100% of the properties, off-the-market, for $14.5 million from Rubin Pikus of Millbrook Properties. The price equals approximately $201,390 per unit.