Nathan, depending on what kind of property you're looking for, I would be happy to talk to you about this. Most listings have very specific caps that can be easily accessed (without doing any actual math; hooray!) So there are ways to find out if you qualify without doing more than three minutes of research.
I live in a HPD building myself; bought in 2007 and am very happy here. There are a few land mines you want to look out for, but it's a terrific way to get into the market at lower-than-market prices.
Send me a message if you'd like to talk further. My building is in Harlem; a LOT of exciting opportunities have come along in the past few years, and they seem to be continuing.
Douglas Elliman Real Estate