May get costly if you have to rerun new lines to isolate each unit.2) Gas - should be easy to add another meter, but how intertwined are the gas lines?

In the isolated case, cash for keys looks like a good option.  

It was a few isolated pockets.

This is done in corporate america to isolate law suites. 

Remember, this is not some isolated incident happening in some other town, this is happening globally in every part of the world.

I really don't think most people looking at door count are looking at it in isolation.

(similar to series LLC's)  This is "new Law" with little case history, but it was written to provide strict isolation of assets to prevent collecting on house B from a problem with house A.

You also need to use wireless access points with the ability to broadcast multiple isolated networks that you can manage remotely and at high enough speeds that will provide tenants with at least 100mps each.

Her fear of the mouse in the house is legit though and I’m hoping this is an isolated incident.  

I doubt this is a isolated case. you need an audit.I took over a property management position and after 2 months on the job after balancing accounts found the prior manager had embezzled over 60K.