Six types of mandatory street walls are established in the Special Manhattanville Mixed Use District, the regulations for which are set forth in Sections 104-331 through 104-336. Map 4 (Street Wall Types and Locations) and Map 5 (Parcel Designation and Maximum Building Heights), in Appendix A of this Chapter, specify locations where such regulations apply. The mandatory street wall requirements shall apply to any development and the enlarged portion of an existing building, except as set forth in paragraph (c) of this Section.

In Subdistrict A, the mandatory street walls specified as Street Wall Types 1, 3 and 4 consist of a lower street wall and an upper street wall, except that for buildings fronting on a wide street that do not exceed a height of 85 feet, and for buildings fronting on a narrow street that do not exceed a height of 60 feet, such street wall may in its entirety comply with the rules for an upper street wall.

(a)        Lower street wall

(1)        For Parcels D1, E1, F1, G1, G2 and H, the lower street wall is that portion of the street wall that extends from grade to a minimum height of 15 feet above the highest elevation of the street frontage of the building on Broadway and a maximum height of 55 feet above such elevation for each street frontage. For buildings without frontage on Broadway, the lower street wall shall be measured from the highest elevation of each such street frontage of such building;

(2)        For Parcels A, C1, C4, D4, E4 and F4, the lower street wall of each street frontage of a building is that portion of the street wall that extends from grade to a minimum height of 20 feet and a maximum height of 55 feet above the highest elevation of such street frontage of such building;

(3)        For Parcels C2, C3, D2, E2, E3, F2 and F3, the lower street wall of each street frontage of a building is that portion of the street wall that extends from grade to a minimum height of 20 feet and a maximum height of 45 feet above the highest elevation of such street frontage of such building. For the purposes of this Section, Parcel C2 shall be considered to have frontage only on West 130th Street.

(b)        Upper street wall

For all Parcels, the upper street wall is that portion of the street wall that extends from the lower street wall to the maximum building height set forth in Appendix B or the height of the building, whichever is less.

(c)        The mandatory street wall requirements shall not apply to vertical enlargements of one story not exceeding 15 feet in height.

(d)        Where a building is located on more than one Parcel, the requirements of Sections 104-331 through 104-336, with respect to the locations of the upper street wall and the lower street wall, may apply to the entire street frontage of the Parcels.

(e)        On Parcels C3 and C4, the applicable lower street wall provision may be applied to the entire building.

(f)        For a building within Subdistrict A, located on a portion of a Parcel where no required street wall is shown on Map 4, such building shall comply with the street wall requirements for a building on the same Parcel. For a building on Parcel C3, the street wall requirements shall be those provisions applicable to Parcel D2.