Our office was asked to transform and expand a 1980’s-era attached duplex into 2 houses, or condominiums. We added 2nd-story master bedrooms to the front of the houses with new living areas below, and thus redefined the massing of the houses, their entrances, and sense of autonomy vis-a-vis each other. We played with the line between sameness and differentness of the units of this former duplex: we underscored that they are two mirror-imaging units of one larger structure, and at moments treated the fronts of each slightly differently, imparting to each homeowner a sense of uniqueness.