A horizontal enlargement of the ground floor and second floor levels within an arcade located within Area A on Map 9 in Appendix A of this Chapter may be permitted upon certification by the Chairperson of the City Planning Commission to the Commissioner of Buildings that such enlargement complies with the provisions of this Section, and the following conditions are met:
(a) the horizontal enlargement meets the requirements of Section 91-831 (Ground floor requirements);
(b) a compensating amenity is provided pursuant to the provisions of Section 91-832 for plaza improvements, Section 91-834 for indoor public spaces, or Section 91-835 for alternative improvements; and
(c) the additional requirements of Section 91-836, as applicable.
For zoning lots with one or more publicly accessible open area, unless an alternative improvement has been identified in Section 91-835, an improvement to all publicly accessible open areas pursuant to the provisions of Section 91-832 shall be required as the compensating amenity required by condition (b) of this Section, and a certification for design changes pursuant to Section 37-625 shall not be required. Where a publicly accessible open area was improved and is fully compliant with a prior certification pursuant to Section 37-625 that was granted before January 19, 2016, the further improvement of such publicly accessible open area shall not be required.
The provision of a compensating amenity as part of a prior certification pursuant to this Section or a prior authorization pursuant to Section 91-841 (Authorization for retail uses within existing arcades) may satisfy the requirements of condition (b) of this Section for a compensating amenity.
As part of the certification, a horizontal enlargement of the ground floor level may be permitted within the area between a street wall and an arcade that did not generate a floor area bonus prior to June 21, 2016. The provisions of Section 91-831 (Ground floor requirements) shall not apply to such portion of the horizontal enlargement.
As part of the certification, a horizontal enlargement of the ground floor level may be permitted along existing building walls that do not face an arcade, and such enlargement shall not occupy any publicly accessible open area. The locational requirements of paragraph (a)(1) of Section 91-831 and the frontage prohibitions of paragraph (b)(1)(ii) of Section 91-831 shall apply to such enlargement. Where an enlargement is located adjacent to a publicly accessible open area, the use and transparency requirements of Section 91-831 for new building walls facing a publicly accessible open area shall apply.
For a horizontal enlargement of 7,500 square feet or greater, a special permit pursuant to Section 91-85 shall also be required. For the purposes of calculating the total area of the horizontal enlargement that is subject to the special permit, the aggregate area of the horizontal enlargement permitted by prior certifications pursuant to this Section and Section 91-837 (Subsequent design changes) and prior authorizations pursuant to Section 91-841 shall be included in such calculation, except the area of an indoor public space shall be excluded from such calculation.
Where any portion of the arcade remains open and accessible, such remaining arcade area shall maintain a minimum level of illumination of not less than five horizontal foot candles between sunset and sunrise. Any non-transparent portion of a building wall between columns that fronts on such arcade area shall be treated with artwork, planting or decorative material. Additional requirements for transparency in paragraph (c)(3) of Section 91-831 may apply.
The provisions of this Section shall apply to the street wall of the ground floor and second floor level enlargement. For the purposes of this Section, a building wall that faces a publicly accessible open area or through block arcade shall also be considered a street wall, and the provisions of this Section for new building walls fronting on a publicly accessible open area shall also apply to new building walls fronting on a through block arcade, except as otherwise specified. The City Planning Commission may authorize a modification of the provisions of this Section pursuant to Section 91-842 (Authorization to modify design requirements).
(a) Location of enlargement
(1) Location of new building walls
All new building walls shall extend to the full height of the arcade. New building walls may only be located between the column face closest to an existing street wall and the column face furthest from an existing street wall or the street wall location of the floor above, except that new building walls within an existing through block arcade that do not face a street may extend past the column face furthest from the existing street wall provided that the standards for through block arcades set forth in Section 12-10 (DEFINITIONS) and all other provisions of this Section are met. New building walls within an existing through block arcade that do not face a street shall not be required to extend for the full height of the through block arcade.
(2) Length of new building walls
An enlargement shall extend for the full length of the street wall, except for the locations specified on Map 9 in Appendix A of this Chapter and except if a corner arcade that adjoins the Water Street street line and another street line or publicly accessible open area is provided in accordance with the provisions of paragraph (c) of Section 37-53 (Design Standards for Pedestrian Circulation Spaces) which may provide a clear path 10 feet wide. However, an enlargement shall not be required along the length of the street wall occupied by an existing parking or loading entrance. Where an enlargement within an arcade extends along two or more street walls, the enlargement shall also include the area where the arcade areas intersect, except as otherwise provided in this Section, and the location of new building walls in such area shall be subject to the provisions of paragraph (a)(1) of this Section.
(b) Permitted uses within an enlargement
(1) Requirements for all frontages
(i) Retail uses
The street frontage or frontage along a publicly accessible open area of the enlarged portion of the ground floor level shall be allocated exclusively to indoor public spaces that are provided in accordance with the provisions of Section 91-834 or the uses permitted by Sections 91-111 (Additional uses in C5 Districts) and 91-12 (Uses on Designated Retail Streets), except that Use Groups 5A, 7A, 7B, 8B, 9A, 10A, 12A, 12B, or 12C shall not be permitted. However, bicycle rental or repair shops and studios for art, music, dancing or theater shall be permitted. Residential uses shall be limited to lobbies permitted by paragraph (c)(2) of this Section.
All uses permitted by this paragraph shall occupy a height no less than that of the ground floor level, and shall occupy a depth no less than that of the enlargement.
(ii) Parking, loading and mechanical equipment
No garage entrances, driveways, parking spaces or loading berths shall be permitted within an enlargement. No exhaust vents or mechanical equipment shall be permitted on any new building wall unless such exhaust vents are more than 15 feet above the level of the curb.
(iii) Maximum street wall width
On the ground floor portion of an enlargement for the following Use Group 6 uses: the maximum street wall width of a bank or loan office shall not exceed 30 feet; and the maximum street wall width of a drug store shall not exceed 50 feet.
(2) Additional use requirement for a publicly accessible open area or through block arcade
At least 50 percent of the total frontage of all new building walls fronting on a publicly accessible open area or through block arcade, excluding such frontage occupied by building lobbies, shall be occupied by retail or service establishments permitted by paragraph (b)(1) of this Section. As an alternative, the amount of frontage required by this paragraph for occupancy by retail or service establishments may be partially or fully located along existing building walls fronting on the publicly accessible open area or through block arcade and the transparency requirements of paragraph (c)(3) of this Section shall apply to such frontage.
Libraries, museums and art galleries are permitted uses that may front on a publicly accessible open area. Banks shall not be a permitted use on any publicly accessible open area or through block arcade. Uses required by this paragraph shall be directly accessible from the publicly accessible open area or through block arcade.
(1) Number of establishments
Along the longest street wall of the ground floor level enlargement, at least two establishments permitted by paragraph (b) of this Section shall be provided on the ground floor level. Frontage that is solely dedicated to access a use on a level other than the ground floor level shall not constitute an establishment for the purposes of this paragraph.
(2) Access, entrances and lobbies
The street wall frontage of an enlarged portion of the ground floor level may be occupied by the primary entrance for the principal use of the building, provided that such primary entrance shall not exceed a street wall width of 50 feet along Water Street, or, along other streets, a street wall width of 40 feet, or 25 percent of the aggregate width of street wall along such street frontage, whichever is less.
For a primary entrance that fronts on a publicly accessible open area, such entrance shall occupy a minimum frontage length of 20 feet or a length equal to the distance between the two closest columns adjacent to the publicly accessible open area, whichever is less. A primary entrance for the principal use of the building may be located along a through block arcade or indoor public space provided in accordance with Section 91-834 (Indoor public spaces), but may only occupy a maximum frontage length of 25 feet.
Where more than 50 percent of the length of the enlargement is occupied by a primary entrance permitted by this paragraph, retail or service establishments with an aggregate frontage length equal to at least 50 percent of the length of the enlargement shall be required along new or existing building walls along the same street frontage as the enlargement, and the transparency requirements of paragraph (c)(3) of this Section shall apply to such frontage along existing building walls.
(3) Transparency and flood resilience
The ground floor level street wall between existing columns shall be glazed with transparent materials, which may include show windows, transom windows or glazed portions of doors, except for certain uses set forth in Section 37-31 (Applicability). Such transparent materials shall occupy at least 70 percent of the surface area of such ground floor level street wall between a height above grade of two feet and 14 feet or the height of the ground floor ceiling, whichever is lower.
Where the use located within the ground floor level enlargement fronts on an arcade that remains open and accessible, the length of such frontage shall be glazed with transparent materials in accordance with the provisions of this paragraph.
Permanent fixtures for temporary flood control devices and associated emergency egress systems that are assembled prior to a storm and removed thereafter and are affixed to a column may obstruct any transparent portion of a new building wall. Such permanent fixtures may be considered a transparent portion of a new building wall. Additionally, such permanent fixtures shall be encased in a decorative material. Temporary flood control devices and associated emergency egress systems shall be permitted in front of any new building wall for a reasonable period of time prior to and after a storm event, as determined by the Department of Buildings.