We aren't zoned for a campground or RV park nor do we want to pursue changing the zoning to that, but keeping it low-key and low-density it doesn't attract attention, nor are we putting massive cap ex into it.

If they say it's a self guided tour with a key code run!

In my experience, cash flow is key, especially for long-term holds, so running a detailed DSCR (Debt Service Coverage Ratio) analysis might be a good step here.On the flip side, if you're eyeing faster returns, a flip might be more lucrative.

The key is marketing on a wide distribution of channels to get a billboard effect and attract those mid term renters.  

That is key, the consistency, and showing that for what you can get will be the indicator if they work or not.

They also have a 'turn key' annuity asset that they can count on for consistent retirement income.

Here are a few key points to consider.• Stronger Comparable Sales: Are there better comparable sales that should’ve been used?

Besides buying turn-key properties with all cash (from the likes of REI etc), are there any other passive RE investment opportunities that will fit this criteria ?

What are some key determinants that establish the “Start” date for long term capital gains?  

The contract should have outlined the amount of earnest money you deliver.