Notwithstanding any other provision of this chapter to the contrary, for the purposes of this section, "mixed use" shall mean a combination in one building of residential dwelling units and other permitted and/or special permit uses, including but not limited to retail stores and banks, personal service establishments, and business and professional offices, and showrooms; provided, however:
[1] At least 50% of the area of the first floor of any mixed-use building must be used for nonresidential use. Residential uses may not be located in the portion of a building's first floor which is immediately inside the building's front facade, it being the intention of this chapter that first-floor front building facades, and the building areas immediately inside first-floor front building facades, will be used for nonresidential purposes. It is the further intention of this subsection that any first-floor residential space will be located "behind" first-floor nonresidential space as viewed from the street/sidewalk adjacent to the building front. For the purpose of this subsection, buildings located on street corners shall be deemed to have building fronts on each of the intersecting streets which form the street corner.
[2] There shall be no percentage restrictions on the amount of residential versus nonresidential space on the second or third floor of a mixed-use building.
[3] Residential dwelling units may be studios, one-bedroom units and two-bedroom units only.