What I do for investing is analyze the economics of the local, city, State, National AND GLOBAL markets.

We'd need to know what kind of market is the park in, Ratio of POH to Tenant owned, Economic vacancy of the park and apartment building, rent in the apartment building, expenses ratios for the park and apartment building, utility set up for the park, age of the apartment, possible deferred maintenance. 

agree with @Andrew Syrios  this is a poor scheme fraud with default and economic danger to the owner of the property...

To understand the economics of it: A broker might typically get paid 3% of the lease value for a 5 year lease; so if you rent a 1200 SF space for $2.00/SF, the calculation is:1200 SF x $2.00/SF = $2400/mo * 60 mo = $144,000.  3% of that is $4,320. 

This area has seen an increase of lower income families over the last decade or so it is on a downward economic slope hence why it's so cheap for investment.

The area has gentrified in terms of economic class and has a strong demand due to its proximity to the train line.

Because of the Neighborhood Improvement Zone or NIZ in Allentown there is economic development going on in the downtown area.

If so, you'll want to find out what the economic vacancies are in your area for similar properties.

I would also look at the economics of airbnb (or similar) in your area.

But if you buy right and it cash flows well, and its in a economically strong MSA, it will most likely be higher in 10-20 years.