Nothing here is calculated. Every tile opens the citywide address search, which reads zoning and land use from PLUTO and districts from Geoclient. All eleven addresses were run through that search and the card’s own answer recorded.
Five are individual landmarks. The Empire State Building, the Chrysler Building, Radio City, Grand Central and the Municipal Building each carry that designation alone. The Williamsburgh Savings Bank Tower and the Brooklyn Academy of Music share the Brooklyn Academy of Music Historic District; Brooklyn Borough Hall sits in the Borough Hall Skyscraper Historic District; City Hall is in the African Burial Ground and the Commons district.
Landmark status is not zoning. Grand Central is C5-3, ordinary Midtown commercial. The Chrysler Building straddles C5-3 and C5-2.5, the Empire State C5-3 and C6-4.5. What protects these buildings is the Landmarks Preservation Commission, not the zoning map.
Four of these also appear on the 27 buildings page. Grand Central, the Empire State Building, City Hall and Brooklyn Borough Hall. Same lots, two different collections.