As far as I understand, if you have fewer than 4 units, you're not subject to restrictions on raising rents.

 The real question is why are you investing in a place with such ridiculous rules and restrictions like DC.  

Check your local town regulations if there are any restrictions on number of people in the home etc.Money wise you really just need to read this site and others about the financial aspects. 

California tends to have more laws on the books and requirements and restrictions that it can be a good idea to form a CA LLC for out of state property so that you as a CA resident are covered, and to try to have your contracts fall under the purview of CA courts.

There are no prepayment penalties and no restrictions on what you can do with the proceeds of the 401k loan.

You might have 60 or 70 feet of height, but how many square feet of lot area do they require?

There may be some restrictions- for instance I can use a fireplace in my own home, but the the same insurance company won't insure us if a tenant is using the fireplace. 

More restrictions since 2018.

did see a lot of drug deals with dudes on bicycles near a warehouse in the middle of plainview was located - When I was in college an employer I worked for rented warehouse space at the empty shopping center in the middle of the community - sure it was a hopping place around WWii at the height of the manufacturing heyday.  

Charlottesville's airbnb laws are very restrictive.