The co-signer is her elderly father who is bewildered by the requirement of the PM to examine his financials as if he was applying for a mortgage and just about throws in the towel. 

I realize that a crux of older cultures is that the elders are always in a leadership position, but your situation may be different and don't want to presume.If you absolutely cannot leave NYC, maybe you can move just outside NYC?

Buyers are willing to pay $$$ for additional flexible spaces that can be used as office, gym, guest home for elderly parents or adult kids, or simply as rental to help pay off the mortgage.

My dear elderly recently widowed friend is financially concerned about making mortgage payments along with taxes and maintenance.

Start collection Homes magazines or look on line at target properties, some will say divorce or elderly seller or what the case might be.

From constant walks and calls on the property to the elderly sick seller asking for advances until we closed.

He is elderly and wanting to travel.

I can't leave my elderly mother for weeks at a time.

Lots I can do here, targeting the elderly perhaps based on median age, etc, may not even need a doc on site perhaps just to ones on call.

The types of sellers that wholesalers go after typically are extremely uneducated, poor, elderly and/or have serious health complications (many times all of the above).