Since you've authorized the service, you're probably stuck at this point but I would tell the tenant that in order to reimburse him, you will need a detailed repair invoice from the contractor - showing payment made - that is in your name as the owner on the invoice. 

If the duplex is authorized, Planning and Zoning will assign addresses and provide you with documentation to take to the post office.

keep in mind if it is at a title company ( a legit one) it cannot be released without your written authorization.. so if you have a contract dispute on time lines.. and the seller wont cooperate  then you have to Sue in small claims or get a lawyer.. 

Each housing authority handles rent increases differently. 

There is actually book available on BiggerPockets that I co-authored with another private lender.

As a lender I pay property taxes and tax liens off all the time; the taxing authorities just want to be paid; they’re not picky about whose bank account the money comes out of.

I would list him as an authorized occupant. 

@James White-Young1) only someone with the legal authority to sell, can sell it…without probate no one will have that right.2) the sub2 “insurance” you speak of is a farce….read the terms more carefully, it’s not insurance, it’s a refinance, if you qualify for it.

If seller is willing, get a written agreement authorizing you to make specific renovations and what happens if Seller voids the contract, Buyer voids the contract, or whatever. 

Not that you should keep them, but you could ask the local housing authority to raise the rent, mine just requires a simple form.