Would not a stop loss or trailing stop be some downside protection? 

My flips are timed to be rent ready in winter months then sell on when resorts close.. these rentals almost pay for the entire yrs mortgage in those 4months but the issue is in the quiet summer months, although these towns with fantastic GOLD standard trails are starting to pick up for the summer months, the REAL catch for me is Ski Resort prices - and lack of multifamily around here..

If it is one meter I would use the trailing 12months and divide by units.The actual Maintenance cost is anyone's guess.Any deferred maintenance?

We just use the Closing Disclosure (formerly the HUD-1) as the paper trail to source it.  

There are beautiful trails and woods everywhere.

Canopy pulls their data on the MLS from SOLD only, with a clear online trail that can be tracked.