In Subarea B1, as shown on Map 1 (Special Inwood District – Subdistricts and Subareas) in the Appendix to this Chapter, for shoreline adjacent lots, the height and setback regulations of Section 142-43 (Height and Setback for Sites in Subarea A2 With More Than 100 Feet of Shoreline) shall apply, except that paragraph (d) of such Section shall be modified to allow a tower to rise to a height of 265 feet, provided that the gross area of any story above 225 feet does not exceed 90 percent of the gross area of that story located directly below 225 feet. The visual corridor located between a line parallel to and 20 feet south of the prolongation of the centerline of West 218th Street and a line parallel to and 30 feet north of such centerline established by Section 142-60 (INWOOD WATERFRONT ACCESS PLAN) shall be treated as a narrow street line for the purposes of applying all height and setback regulations.