There's software that can tell even which blocks has the highest appreciation per zip code. this is for rehab or buy-and-hold long term.The inside factor that really makes higher appreciation is good school districts as parents wouldn't need to pay private schools for their kids. 

Also check for two means of egress in that basement you want to convert because fire code will require it.

It's not a loophole it's part of the tax code.

Maybe you can report the owner to Code Enforcement or similar department?

Still looking for an automated tool for STR regs where I can just plug in a zip code or address and it will layout all the current restrictions in seconds. 

You also need a binding lease that abides by the landlord tenant code of your state so it's enforceable.Totally worth it and why we have the same owners come back to us time and time again as needed when the tenants we place move and they need us again.Good luck

Have you had any success in just providing a lock box code?

They can text the buyer a door code so the buyer can go in without the realtor even being there. 

Each city has is own ordinances from code and violations enforcement to yes Airbnb (short-term rental or not).Then you need the best management company is the blood of you business.

These are professionals with additional training and a stricter code of ethics.