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?