Rent on each unit is $1350 but RentCafe and Rent-o-Meter say $1600.

Is the goal to separately meter everyone? 

The quickest way to confirm though is to use an amp meter to measure the amps being drawn through each of the phases (120v lines entering the panel, usually at the top or bottom of the panel) when running the typical amount of appliances all at the same time, i.e. stove, washer, dryer, water heater, and AC should do it. 

Part of that rehab is that the units are currently two bedrooms but HUGE so we are turning them into 3 beds AND putting hvac that runs into each unit and sub metering water so that the tenants will pay all utilities. 

The property currently has two units, each in its own building, and each separately metered.

Unfortunately I made the mistake of signing these new leases before I had finished figuring out that it was going to be financially smart to sub-meter, and the market willSupport it.

@Hadar Orkibi A 3 bed 2 bath single family house is around 250K in that area.The only value add part I see so far is to sub meter the water and let the tenants pay the water. 

SFR, 1 water meter, they pay.

One burner is gas, the other oil burner.  2 units are on 1 gas and 1 electric meter. 

I assumed meter accounts so I went with $60/month for a 3 unit.3.