So go whine about the results, not about the apartment itself. If there’s noise and trash, whine to the city about that (if and when it happens), not about the apartment itself, which could very well be rented to someone quiet.
What if someone is living there alone and build a second apartment to defray part of the mortgage, and rents it to a person with one car? Both his and the tenant’s fit in the driveway. Or maybe he needs it for an ill family member.
You sound like an intrusive little snitch. If you have concerns, grow some cojones and talk to your neighbor before considering siccing the fucking filth from the city on them.
People like you are why I’d sooner buy a house in a ratty part of the Bronx or in south Chula Vista. At least in less chichi areas, people mind their fuckin business.