NEW YORK CITY — New York City-based real estate firm Studley has signed a lease for its new corporate headquarters. Beginning in the first quarter of 2010, Studley will occupy the 61,000-square-foot 11th floor of 399 Park Avenue for a 10-year term. The company will relocate from an approximately 40,000-square-foot office at 300 Park Avenue, which it has leased since 1987. Mitchell Steir, Michael Colacino and Michael Goldman of Studley provided in-house representation for the firm in lease negotiations. The landlord, Boston Properties, was represented by John Powers of CB Richard Ellis.