Abstract: An improved method of constructing multi-family housing units on a shared foundation comprising common structural designs which are each configurable to multiple space floor plan design options. Each design may be comprised of substantially identically positioned service access points offering common datum locations upon which to construct a variety of different space floor plans. This method effectively segregates the need to fix a floor plan prior to installing a foundation, which allows the developer to conform and transform “in process” inventory to match in a more real-time manner, the volume, design configuration, and timing of condominium unit construction to a buyer's desires and current market demand, thus reducing development risk based on otherwise potentially inaccurate market forecasts.