Where professional or business office use is to be developed in combination with apartment or townhouse use, as provided in § 170-801B(4), each of the two combined uses shall be required to comply with the standards for development (area and bulk regulations, density and design standards, site conditions, open space and other applicable standards) set forth in this chapter and applicable to each such use, if developed independently of the other. In the case of an integrated townhouse development, combined with the said office use, the Board of Supervisors may, in its sole discretion, permit a lot size which conforms to the footprint of the townhouse foundation. In lieu of either the lot of 1,200 square feet or the lot measured by the unit footprint, the developer may elect to provide for condominium ownership. In the conditional use review process where such a combination of uses is proposed, each area of the lot being developed and devoted to a particular use shall be designated and shall be considered a separate lot for review purposes and for application of the respective development standards of this chapter applicable thereto.