64-11 - Definitions LAST AMENDED 12/5/2024 Definitions specifically applicable to this Chapter are set forth in this Section and may modify definitions set forth in Section 12-10 (DEFINITIONS). Where matter in italics is defined both in Section 12-10 and in this Chapter, the definitions in this Chapter shall govern. Cottage envelope building A “cottage envelope building” is a #single-# or #two-family# #detached# #residence# located within R1 through R5 Districts, #developed#, #enlarged#, or altered, pursuant to any of the optional provisions of Section 64-33 (Special Bulk Regulations for Cottage Envelope Buildings), provided that: (a) such #single-# or #two-family# #detached# #residence# complies with Section 64-332 (Height and setback regulations for cottage envelope buildings); and (b) is located within a #zoning lot# that has a #lot area# that is less than that required by the applicable district; and (1) has a #lot width# that is either: (i) less than that required under the provisions of Section 23-11 (Lot Area and Lot Width Regulations in R1 Through R5 Districts) in R1, R2, R3-1, R3-2, R3X, R4, R4A, R5, and R5A Districts; or (ii) equal to or less than 30 feet in R3A, R4-1, R4B, R5B, and R5D Districts; or (2) has a depth of less than 95 feet at any point. All #cottage envelope buildings# shall also be #flood-resistant buildings#. First story above the flood elevation The “first story above the flood elevation” shall be the finished floor level of the first #story# located at or above the level at which a #building# complies with #flood-resistant construction standards# and, for #buildings# utilizing the #reference plane#, shall be no lower than the particular level established as the #reference plane#. Flood map “Flood map” shall be the most recent map or map data used as the basis for #flood-resistant construction standards#. Flood-resistant building A “flood-resistant building” is a #building or other structure#, which complies with all applicable #flood-resistant construction standards#. Flood-resistant construction elevation The “flood-resistant construction elevation” shall be the level of flood elevation required by Appendix G of the New York City Building Code for the “Flood design classification” of a #building or other structure# as set forth therein, or a height of two feet above the lowest grade adjacent to the #building or other structure#, whichever is higher. Flood-resistant construction standards “Flood-resistant construction standards” are the construction standards set forth in Appendix G of the New York City Building Code for “Post-FIRM Construction” that aid in protecting #buildings or other structures# in #flood zones# from flood damage, and governs both #building or other structures# that are required to comply with such standards and those that voluntarily comply. For #buildings or other structures# utilizing the provisions of this Chapter, #flood-resistant construction standards# shall be applied up to the #flood-resistant construction elevation# or higher. High-risk flood zone The “high-risk flood zone” is the area, as indicated on the #flood maps#, that has a one percent chance of flooding in a given year. Lowest usable floor The “lowest usable floor” of a #building# is the lowest floor of such #building# that contains #floor area#, and may include #basements# and #cellars#, as defined in Section 12-10 (DEFINITIONS). Moderate-risk flood zone The “moderate-risk flood zone” is the area, as indicated on the #flood maps#, and not within of the #high-risk flood zone#, that has a 0.2 percent chance of flooding in a given year. Primary frontage For the purposes of applying the provisions of paragraph (c) of Section 64-322 (Special floor area modifications for flood-resistant buildings), a “primary frontage” shall include: (a) in #Commercial Districts#, frontages that meet the criteria for a “primary frontage” as defined in Section 37-311; (b) in M1 Districts paired with #Residence Districts#, frontages along: (1) #wide streets#; (2) #narrow streets# within 50 feet of a #wide street#; and (3) #narrrow streets# where an M1 District paired with a #Residence District# is mapped along an entire #block# frontage; and (c) frontages where non-#residential uses# are required at the #ground-floor level# pursuant to a Special Purpose District or #waterfront public access area#. Reference plane The “reference plane” is a horizontal plane from which the height and setback regulations governing a #building or other structure# may be measured, in accordance with certain provisions of this Chapter. The #reference plane# shall not be located above the #first story above flood elevation#, as applicable. For #zoning lots# located wholly or partially within the #high-risk flood zone#, the #reference plane# may be established at any level between the #flood-resistant construction elevation# and a height of 10 feet above the #base plane# or #curb level#, as applicable. However, where the #flood- resistant construction elevation# exceeds a height of 10 feet above the #base plane# or #curb level#, as applicable, the #reference plane# may be established at the #flood-resistant construction elevation#. For #zoning lots# located wholly or partially within the #moderate-risk flood zone#, the #reference plane# may be established at any level between the #flood-resistant construction elevation# and a height of five feet above the #base plane# or #curb level#, as applicable.