ack when artists could afford Manhattan, Donald Judd bought a cast-iron building on a sunny corner, moved his family there, and proceeded to perfect his loft-as-sculpture. The celebrated minimalist died almost 20 years ago, but the property, which became headquarters for the Judd Foundation
, is ready for public tours only now, after an approvals and funding marathon and a three-year restoration. Architecture Research Office principal Adam Yarinsky painstakingly preserved patina and chipped paint—high-tech interventions such as the computerized fire-safety system go largely incognito in their rough-hewn, artisanal surroundings. Except for new blackened-steel stairs to the basement, it’s like a time machine set on 1992.