Anyone just starting out might find it a bit challenging to do Subject To on their own, with all of the aspects you need to know, but you learn those over time and then it's "sell them like hotcakes". 

I will look into the licensing aspect to see what the laws are in PA as well as a profit sharing agreement (not too familiar with those yet). 

My favorite aspect was the community itself, in that there's literally every type of person, and most everyone gets along and is intertwined.  

As already mentioned it is really crucial to thinking about the end game.

That being said, I love the idea of them and still think they could make an interesting value add to a portfolio, especially if combined with some sort of short-term/unique/corporate/vacation rental aspect.

If your business paid for something to be used for many years and is relatively expensive, say a $100,000 excavator, you spread the $100,000 deduction over 7 years, aka depreciate it over 7 years.You can then dive into more complex aspects of depreciation:why 7 years?

So look into that as well a good real estate attorney that is crucial mines was not so good.

Unfortunately, you are learning about the security deposit aspect the hard way at this point.As mentioned already, you say you were going to use the funds towards "renovations."

Are there any crucial and specific questions that you all aim to ask in an interview with them?

I was thinking that you could be talking about the financial aspect of the note, the title of the property and position of the note, the collateral condition and or value, or the financials of the borrowers.