Peeping in New York City is an urban research conducted across the five boroughs of New York City in November 2007 as part of the graduation studio ÔBorder ConditionsÕ at the Technical University Delft. The mapping concerned more than 80 spaces revealed by peeping through small holes and openings. The concept is to reveal the concealed, to show another New York City than the one we already know. The mapping is the starting point of an architectural design for a Nightclub inside an existing building at a hill in Fort George, Manhattan. The design methodology is based on 3D computer design.