The YP Building, a mid-rise tower in Seoul completed in August 2025, is situated at the junction of a low-slung commercial area and a burgeoning residential redevelopment. Realized by local firm Simplex Architecture, its composition—a series of stepped terraces unified by a gridded facade of stone panels—is an artfully pragmatic response to setback regulations. The upper floors accommodate leasable offices, except the topmost, which is reserved for the building’s owner. More commercial space occupies the ground floor and even the basement, where the architects have carefully inserted a sunken courtyard to introduce daylight.