Landmark: Boerum Hill Historic District: Historic District. Regulation type: Certificate of No Effect. Work types: Filing any work, HVAC equipment and other mechanical equipment on rooftops or terraces over secondary facades, Rear yard decks, Alteration, Restoration and Maintenance of existing fire escape, Interior Alterations, Areaway paving, steps, or planted areas, HVAC equipment in yards and areaways fronting secondary facades. Address: 221 DEAN STREET. Community Board: BK-02. Issued: 2022-01-05. Expires: 2026-01-05. Applicant: John H. Hatheway Jr. Owner: Maya Williamson.