MEDICAL OFFICE FOR SUBLEASE. Complete with high-end finishes, this 11th Floor medical office is an excellent opportunity to be situated in a great location on Madison Avenue between East 59th Street and East 60th Street. 635 Madison Avenue is close to Central Park, luxury hotels, fine dining, and world-class shopping. The building is convenient to major transportation including the N, Q, R, 4, 5, and 6 trains and multiple bus routes.