This five-story townhouse in Manhattan was transformed from a series of dark rooms into a light-filled family home for an art-collecting couple with three children. Central to the design program is the dramatic, sweeping stairwell that is crowned by a skylight, which allows daylight to flood every floor.

An open-plan kitchen and dining area provides a space for informal entertaining and leads to an outdoor terrace and garden. The upper floors house living and sleeping quarters, while a Moroccan tiled pool—with each tile a different color—is located in the basement, and a sauna graces the top-floor bathroom.