Take the sentence:
Isn't there a bunch of laws around who can stay open until what time though based on location and # of residential buildings around the bar?
Bunch is singular, and the sentence is referring to a bunch of laws.
Another example, not using bunch:
Isn't there a collection of paintings?
That uses "Isn't" not "aren't"
Can you throw the prepositional phrase, and consider what comes directly after is irrelevant in terms of plurality?
Of course you can throw the prepositional phrase and consider what comes directly after to be irrelevant in terms of plurality and how does that change your original premise, please?
– Robbie Goodwin May 12 '18 at 18:05