A new owner with a light touch has kept Marcel Breuer's 1959 Hooper House II a marvel of the mid-20th century whose life will extend well into the 21st. Resident Richard North only modified the idyllic, suburban Baltimore retreat with a few contemporary design moves: replacing the roof, putting glass doors on the fireplaces in the children’s playroom and the living room, considering taking down part of a wall to add a pass-through window to the skylighted kitchen (but later thought better of it), adding garage doors to the carport, and converting the adjoining stables to make more garage space.