I had a WIDE range of quotes for my building, but I ultimately winded up using Hemlane for the quote as they had the best price and coverage. 

Get a couple of quotes because they can be pretty wide apart. 

Costs can vary widely, but you might expect to pay anywhere from $10,000 to $25,000 for a comprehensive PPM (Private Placement Memorandum), Operating Agreement, and Subscription Agreement.

Cons: Property taxes can vary widely depending on the county.

It was based on statistics from many landlords over a wide variety of portfolios. 

The viability of an AirBnb strategy would also fluctuate widely based on where it was, ie at 116th and Kinsman vs on Dorchester in Shaker hts...

This group does allow syndicators to present deals, so your father would get deal flow, but he would also benefit from a wide group of other passive investors discussing the deal and sharing their thoughts.

Reality is the rent to price ratio is still so wide, no one can afford to buy.

Rentometer provided a rent range of $1,852 to $2,258, which is a very wide range.Below is the cash flow for this property based on the low, median, and high Rentometer rent projections.Depending on the Rentometer rent estimate you choose, you will either incur a loss of $94 per month or make a profit of $312 per month.

Beyond that, most self storage only being 8 1/2 foot tall or so wide, a 10 x 30 or 10 x 40 storage unit can't handle RV's and boats.Recreation areas/cheaper land:  The way you beat your competition is to build closer to the Recreation areas or on routes to them, from the populations.