No rooftop helipads in NYC since this
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5 KILLED AS GOPTER ON PAN AM BUILDING THROWS ROTOR BLADE (Published 1977)
5 killed and 7 critically hurt as NY Airways helicopter landing gear collapses during passenger embarkation at heliport atop Pon Am Bldg, NYC; 5th victim is Madison Av pedestrian struck by pieces of rotor blade; witnesses describe accident; scene described; criticisms over safety of Pan Am...www.nytimes.com
Similarly, many of the building helipads in the LAX major metro area are emergency use only. Not for routine ops.