Although they have been a lifesaver for me they probably are not what I would use today, however because they are not consumer oriented you have a LOT of control all the way up to locking out the thermostat completely to only follow your programming.

Just looking for a way to gain back control of the situation without antagonizing good tenants.

I have a Bryant furnace roughly 40 yrs old, still working but sometimes it does not stop thru the thermostat control.

If so, the Association usually insures and controls the exterior of the building. 

Personally, I'd avoid that because it means high prices and huge HOA fees and you have no control over your revenue stream so this isn't the best way to get a great ROI.

., more than half of the calendar year) for the Borrower's personal use and enjoyment·The Borrower may rent the property on a short-term basis provided that the property is not subject to any rental pools or agreements that require the Borrower to rent the property, give a management company or entity control over the occupancy of the property, or involve revenue sharing between any owners and the developer or another party·The Mortgaged Premises must be in such a location to function reasonably as a second home·The second home must be suitable for year-round occupancy with the following exception: a second home with seasonal limitations on year-round occupancy (e.g., lack of winter accessibility) is eligible provided the appraiser includes at least one comparable sale with similar seasonal limitations to demonstrate the marketability of the subject property.

Many have, for all practical purposes, lost decision making control. 

It'll require a Tenant in Common or Delaware Statutory Trust setup.

Not sure what Delaware is like but Texas is starting to have meets ups again.

The left side is where the controls are.