In C4-2 Districts within the Upland Subdistrict, the rear yard equivalent regulations for residential uses on through lots, or the through lot portion of a zoning lot, are modified as set forth in this Section. Such yards shall be provided within 45 feet of the centerline of the through lot or through lot portion, and the level of such yards may be provided at any level not higher than the floor level of the lowest story containing dwelling units that face such yards. Furthermore, no rear yard equivalent regulations shall apply to any through lot or through lot portion of a zoning lot on which a tower is developed or enlarged, pursuant to Section 128-35.