It doesn't take 1,000 years for Millennium Partners to turn a plain vanilla city block into a coveted address. Millennium Partners redevelops underutilized urban buildings and turns them into mixed-use, million-dollar condominium and hotel towers. Its $4 billion portfolio consists of 1,600 condos, 1 million sq. ft. of office space, and more than 1 million sq. ft. of retail space. Millennium Partners' hotel residences are developed with Four Seasons and Ritz-Carlton. The company also owns The Sports Club, a chain of upscale fitness centers. Millennium Partners has properties in Boston, Miami, New York City, San Francisco, and Washington DC. It was founded in 1991.