[I have no knowledge of how contracts with Buyer's Agents work, so my comments can certainly be ignored if inappropriate]. 

@David DachteraSome properties have sub-metering already installed. ( water usage )Option : piggy back system could be installed              owner could set-up a prepayment program             etcCurrent owner would be responsible, if the tenants fails to pay waterusage by December 1st on their property taxes bill.  

You could install additional blown-in insulation which won't cost a lot, the reduction of the R Value is both energy saving and helps the AC usage. 

The other 2 are rented for $900 to market rate tenants who pay for their water and sewer usage.

I'm starting to look into a service that can sub-meter the water usage on a multifamily property in North Carolina.  

Yes, I will follow the guidelines on the vacation rental and not exceed 14 personal days of usage. 

Now they are having a dispute with the couple on the 2nd floor about backyard usage. 

One area you will likely be able to reduce costs is with utilities - so check the attic insulation depth, if it's skimpy then blow in another 8 inches or so and rest assured you will cut the usage rates significantly.If you want more details or info/pointers get my number off my profile and call or text.Best of luck to ya Taylor!!

They use a little more water than my triplex that doesn't have laundry, but when you factor in 6 vs. 4 adults I would expect that much water usage anyways.  

While our small units can vary $20-30 a month on usage, most of the cost is fixed sewer and garbage.