Split Line Housing responds to the hard boundaries separating people from each other in the South Bronx by using simple gestures to recontextualize elements from traditional housing blocks, creating a project that is both open and secure. The spine, occupied by a central public market, weaves together residential and commercial programs on the ground level. The traditional double-loaded corridor is widened to create large residential atrium spaces located above public spaces. Inside each unit, moveable facade panels and a 2.5-foot floor shift enables unit customization and endows a sense of character and ownership.