Strategy to approach previous owners in right-of-redemption case?

[Sunny Pyun]

I was about to close on a city-owned property in upstate NY (specifically Newburgh), and ran into a problem when the title report came back. The title company says they can't insure for 2 years due to the right of redemption. I actually posted about this a few days ago, and some people suggested either I get a waiver or buy out the previous owners. How would you open the dialogue with them? Obviously a waiver is better than a buy out but I'm wondering what's a prudent way to handle this situation if I decide to go down this route. If I can't get this done, I will have to give up the property. Thank you.