I've done some research and thought Campton, Waterville Valley, NH area would be an ideal location for all season rental.I'm nervous not being able to find renters to cover the mortgage.  

To find out your max build you'd have to look up the code or ask a planner what the FAR isDepending on the location modular might make sense.

@Joshua Rodriguez - I'd pick location first, then determine what return you would want that will help you determine your size.

After building some rapport, he offered a 23 unit brick complex in a solid location on the New Britain /Kensington line for 300k down then eventually lowered it to 250k down for a length of 10yrs @ 6% and wants 55k per unit.

I'm not a fan of investing in small properties located in areas that are not familiar with unknown managers.

What is your experience in buying in markets outside of your location to setup Airbnb's? 

@Dave Foster, you've nailed my issue precisely. 

Our location is near transportation so an easy commute into Philly. 

However, if you like QBO but really wanted to save money, there is a workaround, that is Location.

All funds, coming and going, must pass the security checkpoint first, before moving through the door to the next location.1 - The loan money sits in that account until the borrower/REI has the investment lined up that will make the payments back to the lender.