Abstract: A multi-unit residential building having a perimeter residential units along the perimeter of the building, and a common area with occupiable spaces that are generally centrally located to the residential units creating two parallel corridors between the residential units and the common area for easy and efficient access to the common areas by residents of the residential units. The common area provides typical amenities and rooms normally found inside a private residential unit. A reservation system can be used to coordinate efficient use of the common areas. Non-residents can rent out the common areas with proceeds used to offset building costs to lower costs for the residents.

Abstract: A building structure including a first unit having a front elevation, a rear elevation, a first side wall, and a second side wall; and a second unit having a front elevation, a rear elevation, a first side wall, and a second side wall; the first and second units being joined together with first side walls of the first and second units sharing a common border and with the front elevations of the first and second units facing opposite directions.