Grhusa Properties Management, 190 Shadow Lake Rd, Ridgefield, CT 06877, US

As one of the world's top real estate developers, operators and managers, Tishman Speyer oversees more than 116 million square feet of commercial space and 92,000 residential units—not only in major U.S. cities such as New York, Boston, Chicago, Los Angeles, Atlanta, San Francisco and Washington, D.C., but also internationally, from Mumbai, India, to Sydney, Australia. Built in 1981, the company's Stamford office park, located near the historical Merritt Parkway, consists of three aluminum-and-glass-paneled buildings on 17 acres surrounded by courtyards.