Keep in mind good tenants want stability and want a lease that gives them guidelines to future expectations of where they will live.  

For nationally, your best bet are professional associations. 

There will be a number of ways that the insurance company will handle this depending on how they have filed their guidelines:1. one policy covering both buildings and the Liability2. separate policies with one covering a building and the Liability for both and a second policy just covering the 2nd bldg.3. separate polices each covering a building and LiabilityCheck with your agent to be sure, but my guess is that the company will want to do 2 policies regardless of the second mailbox.If you quote this out to other agents you will probably get quotes with different options from different companies.  

You are in a good position.Regarding your #2, your best bet is to finish the work so it appraises higher, then just get a cash-out refi.  

Your best bets will probably be local banks or credit unions. 

This depends on the loan underwriting guidelines for the specific loan type you're pursuing.

Pinpointing newer buildings will definitely decrease your chances of major repairs, but checking in with the current owner and paying close attention to the inspection seems to be the best bet to make sure you know what you are buying.

Nobody on CNBC are going to tell you that there are problems at the top of the Stock Market and you should Hedge your bets in preparation for all the new Rules and Fees and Taxes that the new Administration is planning to force on us.

I bet you will be surprised.Maybe just leave it like that.

The 70% rule is NOT a rule, but a guideline for a "back of the napkin" calculation.