I'm concerned that the combined load of heat pumps and ancillary heat strips, along with other appliances, might exceed the 100-amp capacity during winter.As part of our future plans to add a third unit and separate the utilities, we intend to install two additional meters: one for common areas and one for the new unit.

And many times the owner still has to end up fixing the issue when the tenant leaves. 

They are either going to be financially strapped or leave the area, or both.

If guests leave a bunch of dirty dishes behind (which is more likely without a dishwasher) it could really bottleneck your turnovers. 

However the negative reviews have been consistent for a few years, and still recently, so that is a concern.

I would also be concerned with land rent going up over time, and having no control over that.  

If it costs $500 to fill the oil tank and the tenant leaves it empty, that's $500 less you have to cover unpaid rent, cleaning, and repairs.

I had a decent set of renters that are leaving after their lease is up at the end of this month.

I’m not so concerned with how to turn them on, it’s more what immediate issues may I encounter when doing so and how can I mitigate them.

Can you go ahead and change that (think address of record for LLCs or bills for other properties).Make sure any HOA and the local government allows for your home as an MTR.1 last point to add to Jamie's first point: if you can, take a video tour of the home and what you're leaving behind.