Landmark: Park Slope Historic District Extension II: Historic District. Regulation type: Certificate of No Effect. Work types: HVAC equipment and other mechanical equipment on rooftops or terraces over secondary facades, Primary Facades: Existing original/historic openings at small residential and commercial buildings, Non-occupiable Space: Buildings in a historic district, Areaway Ironwork, Security gates at door openings below or under stoops, Rear yard decks, Existing openings at nonvisible or minimally visible secondary facades, New or modified openings at nonvisible or minimally visible secondary facades, Construct patio, retaining wall, berm, in-ground pool or other landscape feature, Filing any work, Filling in existing openings at nonvisible or minimally visible secondary facades. Address: 34 SAINT MARKS AVENUE. Community Board: BK-06. Issued: 2019-04-26. Expires: 2023-04-26. Applicant: Brendan Coburn. Owner: Curt Beech.