@Yashar E. have you looked into getting a mechanics lien on the property?

Your emphasis should be on HOW.

The appraisal should be based on the Income Approach with the Sales Approach given secondary emphasis.

Emphasis on cashflow.

In my non-attorney way of thinking, if you participated in the construction/design and had your crew doing some work, it might be a stretch, but I'd consider a mechanic's lien.Is the 'IOU' they gave you in the proper form of a promissory note? 

You will have to put up with being treated with all the mechanisms that the society excludes aberrant people: contempt, ridicule, disregard.The best thing that I can say about the second point is that once you do start making some money, it's amazing how quickly the same people that treated you like garbage start fawning over you.

(emphasis added).Unless I'm misunderstanding you, this is a formula for disaster, Perhaps you're suggesting @John Keenan load up his offer with contingencies that will allow him to bail out later when he's finished his homework?

When it comes to mechanical systems on a multi family.

Max - you can call Ertz Mechanical anytime they aren't available! 

Where can i find Utility and Mechanics Lien information, specifically the amount owed against the Philly Property?