One Madison Residential Condominium Tower, 23rd Street, Manhattan, Flatiron District, New York City, New York, United States

Interiors and amenities
When Related Companies took control of One Madison, about half of the units were finished, with interiors designed by Cetra/Ruddy, the architecture firm that designed the building’s exterior. For the remaining apartments, which were in various states of completion, the new owners hired the interior design firm Yabu Pushelberg, which also created the interiors of the new main lobby and the amenity spaces.
Rem Koolhaas designed the interiors of many of the condominium's originally planned amenities, which included a private screening room, an upscale restaurant run by chef Charlie Trotter, a spa and fitness room, and a wine cellar. After the building came under Related's control, the amenities were announced as including a lounge and screening room, private dining room, a fitness center and a room for yoga, a 50' foot lap pool and steam room and a playroom for children. A full-time doorman is enhanced with concierge service.