Finally, an apartment building could use the same scheme of movable columns and wall panels, this time with a three-foot grid. The renter could choose either an 1557-square foot apartment with fixtures for a kitchen and one and a half baths (left diagrams), or an 1188-square-foot apartment with just one bath (right diagrams).  The large units have six doors opening onto the patio or balcony; the small units, four. He then could configure his apartment to have one bedroom (green), two bedrooms (blue), or three bedrooms (yellow), in whatever arrangement he thought best.