Modifications of and Additions to Existing Buildings.
63 RCNY § 6-04
in effect§ 6-04 Modifications of and Additions to Existing Buildings.
(a) Applications for proposed work. An application shall be filed for any proposed modification or addition to any existing improvement or the construction of any new structure within the Riverdale Historic District for review by the Landmarks Preservation Commission and no work shall commence until the Landmarks Preservation Commission has issued a permit approving such work.
(b) Pre-1940 buildings.
(1) The Landmarks Preservation Commission shall issue a CNE or a PMW for the following:
(i) Any addition to an existing structure which does not result in damage to or cause the demolition of a significant landscape improvement and which is to be situated in such a way as not to be visible from a public thoroughfare.
(ii) Any modification to an existing structure which:
(A) does not result in damage to or cause the demolition of a significant architectural feature or significant landscape improvement; and
(B) which is compatible with the existing structure's special architectural characteristics in terms of the placement, style, size, materials and finish of such modification.
(2) The Landmarks Preservation Commission shall consider an application for any of the following types of work as a request for a certificate of appropriateness and shall hold a public hearing on such application:
(i) Any addition which is visible from a public thoroughfare.
(ii) Any modification or addition which does not meet the criteria for issuance of a PMW or CNE set forth in 63 RCNY § 6-04(b)(1) above, including any modification or addition which would result in damage to or cause the demolition of a significant architectural feature or significant landscape improvement.
(c) Post-1939 buildings.
(1) The Landmarks Preservation Commission shall issue a CNE or a PMW for the following:
(i) Any addition to an existing structure which does not result in damage to or cause the demolition of a significant landscape improvement and which is to be situated in such a way as to not be visible from a public thoroughfare.
(ii) Any addition to an existing structure which:
(A) although visible from a public thoroughfare does not result in damage to or demolition of a significant landscape improvement; and
(B) is compatible with the special characteristics of the Riverdale Historic District in terms of placement, height, roof line, materials and finish of such addition.
(iii) Any modification to an existing structure which:
(A) does not result in damage to or cause the demolition of a significant landscape improvement; and
(B) is compatible with the special characteristics of the Riverdale Historic District in terms of its materials and finish.
(2) The Landmarks Preservation Commission shall consider an application for any of the following types of work as a request for a certificate of appropriateness and shall hold a public hearing on such application:
(i) Any addition or modification which results in damage to or causes the demolition of a significant landscape improvement.
(ii) Any addition or modification which does not meet the criteria for the issuance of a PMW or CNE set forth above in 63 RCNY § 6-04(c)(1).
Source: City of New York, Charter, Administrative Code and Rules (American Legal Publishing XML export, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/newyorkcity/latest/NYCrules/0-0-0-90777Fetched: 10/24/2026