I live in SE Harlem (a few blocks north of where you're looking), and would be happy to look at the specifics of the deal for you.
There is one specific lottery building that I do not think is a good value for the price. If you'd like to get in touch, I would be happy to talk through this with you!
There are a lot of great values in Harlem. There are also some not-great values in Harlem...like everywhere. For example, I know of a below-market HDFC foreclosure in the area that I can't believe nobody has snagged. I would buy it myself if I could. Would love to show it to you if you're interested!