Where a single lot under individual ownership extends from one street to another, defined herein as a "through lot," both frontages shall be subject to the front yard requirements of this chapter. However, in the case of construction of a single principal building and/or an accessory building on a through lot, the applicant shall specify which street line is the front street line. The other frontage shall be deemed the rear line and shall comply with the rear yard setback of the district .