@Stefan Demopoulos, as Jay said, the self-sufficiency test is the reason it wouldn't likely work in this interest rate environment.

I would keep it to two units as most 3-4 units right now don't pass a self sufficiency test and will require much more than 5% down.

Simple W9 should be sufficient 

While the attic distribution wire was sufficient for 30A, the feeder lines were not.  

If you have sufficient # of unit to where the cost of hiring a book-keeper is worth it, then yes, get one.

Having done a number of shower stall tile installs I am amazed that anyone would expect the paper coating on green board would be sufficient to absorb the thin-set to ensure the  adequate adherence of tile to a vertical surfaces vs that of cement board.

@Jake KozulWhile Nicholas is correct that no thermostat is tamperproof, you only want to make tampering sufficiently difficult as to deter it.There are several, mostly commercial, thermostats which allow for different levels of users and allow you to restrict some or all of the functionality.  

@Zorian Rotenberg depends on unit type if it is multiple homes on a lot probably about 3-4k per unit, if it is a duplex 5k total is sufficient, if it is an apartment building where they don't need a yard the footprint of building and parking is enough

That is tough bc triplex and fourplex have to pass the self sufficiency test in order to qualify for FHA Loan.

Introverts understand the concept of quality over quantity.