The 300 and 310 units are both the same tenant - a doctor's office who also has a rehab center (the previous owner installed an elevator for them 1 year ago).Tenant 105 signed an extension for 3 years to 2020 last month at the same rent terms (3% annual increases from the current rent).Unit 200 is a dentist (lots of plumbing installed specifically for them). 

Anyone have suggestions for strategies that could help elevate excessive AC use at a vacation rental?

I'd do a contract for a hundred bucks, other good and valuable consideration.You might check the environmental issues, you might be able to fill a small area for a building foundation bring it out of the flood plain with a spot elevation making a buildable site out of it.

And THAT drive for CONTROL of ones future, that DRIVE to elevate one's destiny, THAT is a BIG reason so many choose to ACTIVLY hold the reigns of one's financial future vs "trust" in some no-name no-care TRADERS on some dang island in the east called Wall Street, and the "hopeium" that they will deliver us that desired future. 

Who knows they may be able to work something out with you and elevate the situation a hair.

I live at 7,100 feet elevation.

We negotiated a bit and signed a contract that was contingent on appraisal and elevation.

Tenants who can afford to live in a houses or townhouses, won’t go to an apartment to deal with loud neibors, dogs barking, no elevators, quarrel about parking etc.Most often apartments house the lowest part of the Tenants: criminal record, unstable income, low or no credit etc.

Long term: I am primarily looking for mountain property w/ or w/o house; probably between 6000 and 8500 ft elev. 

slight elevation here or gradual dip there.