They should have the option to install a security alarm at their own expense.

Can anyone recommend a reliable plumber or handyman who could install it for me?

Some townships will require certain items, like an escape window if below grade or a walkout to be installed.

The electrician got the 4 gang meter pan installed and went through all the fuses and whatnot to divvy out and installed separate panels for each unit.

That is cheap to install 2 units in my opinion. 

Especially the ones that use a lot of metal & glass. 

People tend to waste a lot when everythings included, so this helps to avoid that problem.There are also companies out there that can install a meter in lieu of doing a full submeter to ascertain how much usage the unit is using monthly.

We have an upcoming meeting with them to see how we can extend the loan a few more years to make the total monthly payment including installments for the annual property tax bill, which we’ve had to pay for them this year since they were late the last couple years and had to pay interest to the county. 

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Install low flow water heads, swap the washer/dryer with High Efficiency models, replace the water heater with a tankless version and lock the temperature at a reasonable level, install smart thermostats that will automatically reduce the heat/cool when it senses no one is home, swap all the lights for LEDs, etc.