AD:ARCH designed a balcony for the penthouse condominium at the Marquette Building. The balcony overlooks the pool on the roof below and acts as an extension of the living space in the penthouse. The railing is glass so that views to the river are maintained. A glass shelf runs on one side of the balcony. The structure of the balcony is architecturally exposed structural steel and welded rather than bolted for a clean look.