It has worked so well I installed another one this year and plan to install one every year in the remaining units.

Operating Expenses (30-35% of Income)Rule of Thumb: Allocate 30-35% of your rental income to cover operating expenses such as property management fees, maintenance, repairs, utilities, and insurance.Why: Properly budgeting for these expenses will keep your properties well-maintained and avoid unexpected financial strain.3.

Makes me wonder why more of them aren't making proper efforts to educate themselves on value and instead think that a house selling for say $250K is a great deal because it is much cheaper than houses where they are from.

Take ownership of your mistake and learn to do the proper due diligence recommended above😊

You will not have the existing power supply that I assumed.Still I like @Jill F. idea of installing mini-splits.

We installed an interior French drain system in the basement, because we knew that the neighborhood is prone to water intrusion.

I would recommend you install noise sensors so keep a tab on guests and collect CC information from every guests.

The rest "should be" (if bought properly), paid for by someone or something else. 

Take ownership of your mistake and learn to do the proper due diligence recommended above😊

If so, make sure agreement is in writing, signed by both parties, specifies new end date and ensures any existing security deposit will still be dealt with properly per landlord/tenant laws, and I'd also ask for a partial payment to be issued at signing to make obtaining his new place easier.