Adding a penthouse perch to this 1899 row house with a harbor view demanded unusual tactics. To circumvent municipal limitations on floor area, a section of floor was removed from one level and “transferred” to the roof as a new studio space. To comply with local height limitations, an innovative structure of solid wood studs was deployed to reduce floor and ceiling thicknesses to the bare minimum. Aside from creating the desired rooftop refuge, these gymnastics also created a dynamic cascade of interior living spaces for an urban designer and his family. Photos by Bruce Buck.