Lacecap Hydrangea--NYC

My wife was certain that this is a hydrangea (it's in front of our large apartment building on New York's upper West Side).

Her first guess was "lacy" hydrangea--very close to lacecap hydrangea--fun to view large (it could be an atomic physicist's delight. A bit of Googling makes clear there are dozens (if not hundreds) of varieties of hydrangeas.