https://thepointsguy.com/news/when-helicopters-landed-on-man...
It did not work out so well...
On May 16, 1977, the landing gear failed on a Sikorsky S-61L (N619PA) while it was taking on passengers on the roof of the Pan Am Building. The aircraft fell onto its side. Its spinning principal rotor blades killed four passengers waiting to board (including movie director Michael Findlay) and injured a fifth. Parts of a broken blade fell into the streets below, killing one pedestrian and injuring another. The accident precipitated the permanent closure of the heliport.[11]