The owners, a married couple who collect contemporary art, originally wanted Sugimoto to create just a Japanese tearoom within the 8,000-square-foot apartment. They had seen one he conceived for his own studio in Manhattan, and they visited a Tokyo restaurant, Sahsya Kanetanaka, that he completed in 2013. As work progressed, they asked him to take over the entire project. In searching for a local architect, Sugimoto found Susan Yun and her associate principal Felix Ade through architect Annabelle Selldorf, for whom Yun had worked. The elaborate four-year design and construction process—executed by New York contractor Xhema—wrapped up in 2018.The apartment, which occupies an entire floor high in the concrete-frame structure, was formed from two apartments that were sold as raw space (Yun did have to change certain plumbing and mechanical components). The tower’s square floor plan, where perimeter beams and columns form the exterior structural “tube,” permitted column-free rooms to be arranged along the four walls of the building and arrayed around the structural elevator core.