PROFESSIONAL or MEDICAL OFFICE: With enormous sun-flooded south-facing windows, this office is an especially wonderful work environment. Features include a reception area, waiting room, consultation room, exam or storage room, and a rest room. Centrally located, near excellent transportation, the office has 9ft. ceilings and crown moldings. The space is situated in Millan House, a co-operative since 1947, built by John D. Rockefeller Jr. in 1931, and has a has a separate street entrance. Millan House consists of two separate buildings connected by a two-level Italianate interior garden courtyard.