The appliances are also all brand new installed this year- fridge, dishwasher, and washer/dryer.

We have installed a permitted tiny house on the land, water meter. electric meter (that can accommodate a large house), and a 5 bedroom septic.

It's easy to install and cut. 

If a sale and capital gains the only option, you could look at seeing if he was interested in selling you all his portfolio on an installment sale and then 1031 exchange the proceeds into a private real estate fund. 

You cannot charge one dime more nor a "pet fee" because service animals are NOT pets.If the applicant wants special features such as a wheel chair ramp, etc they MUST install that at THEIR expense and you can require them to bring the property back to its original configuration at the end of the lease at THEIR expense. 

Someone with a home in the mountains mentioned that we MUST install a furnace and cannot rely on the wood stove alone.

For sewer, our "grey water" (any water that goes down a sink or shower drain) is ran through a field line underground that we installed to distribute water underneath the year.

I have the funds to pay for the roof replacement, and I would pay for it ahead of the actual purchase, but hate loosing on the tax depreciation on installing a new roof since I'll be paying for something I don't own.

Each year at renewal we ask them what we can do to make their place better, maybe painting a room, installing a new fan,  .. anything up to $200,  so they tell us what they want, and it's fully tax deductible.  

Another thing to be aware of is the moving and installing of these homes.