Once he has supplied those, ask for the part of his IRS tax return that deals with this property.

My son agreed to do it, as his 'deposit' (landlord bought supplies so it was labor only) They lived there a few years and when move out time came...and place was in great condition...my son wanted his 'deposit' refunded.

what purpose does it serve you to know how much he is charging for framing, plumbing, electric, framing material, electrical supplies?

After that, the Law of Supply and Demand is king.

It seems like if it's a sellers market, low supply and high demand, the ball is really in their field (or sand box).

You seem to think that the long term supply and demand fundamentals have changed and it will continue to appreciate ... you are local so I concede that you may be seeing things that I as an outsider looking in am not.

I know the worry of having two mortgage payments but rentals are low supply right now so there is low risk that it will be vacant for long.  

I realize a lot has to do with low supply/high demand and income growth in these counties. 

I set up Amazon subscription items to be delivered to the hotel and they restock our supplies with them.

Leave rooms unfurnished, supply basic (kijiji quality) furniture in the common rooms?