Chop suey was pretty much an American invention. Nothing much Chinese about it. https://www.snopes.com/fact-check/chop-suey-origins/These chop suey houses... were the signs referring to the specific dish (which is pretty rare in Chinese restaurants now) or was chop suey a catch-all label for Chinese food in general?
a) the building has lost all its charm
I used to work in the area from the time Stork and Sons was still in operation. You would occasionally see the odd live chicken strutting around the alley at the side and back - chickens would be delivered live and a few would sometimes get loose.