You either do it yourself or you contact management.

I’m a landlord. It’s my job to make sure the building (including the outside) looks and operates nicely. I mean, yes, I would groan and bitch about it internally when the request came in, but if it has to be done, it has to be done.

Submit a request through 311 or call your councilman. It’s surprisingly easy to develop contacts within their offices; most of the aides are really responsive. They can also issue a trash ticket to the property owner.