A Certificate of Appropriateness is mandatory when proposed sidewalk repairs involve a distinct departure from the historic materials present, such as replacing original bluestone with custom-tinted concrete. Because these changes visibly modify the historic streetscape, the application must be presented before the local Community Board and the LPC Commissioners during a public hearing. Securing a C of A is a highly detailed process requiring material samples, architectural drawings, and a thorough review of structural impact. Resource: https://www.nyc.gov/site/lpc/applications/apply-for-a-permit.page
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