This five-story townhouse in New York City's Murray Hill neighborhood was originally designed as a single family house but later converted to apartments in 1938. We were asked to transform it to a modern single family house while keeping the "old world charm" of the original building. The extensive interior and exterior renovation resulted in 13 bedrooms, 10 baths, laundry, pantry, kitchen, dining, library and various gathering and work rooms. These needed to function well by today's standards, but look as they had always been there. The exterior facade was cleaned and restored. New windows and exterior doors and new heating, ventilation and AC systems as well as plumbing, electrical, and roofing were installed.