@Tone Church - I think you have the right idea (2nd one).. tear down, build new home, sell for a profit. That also depends on what homes in that area are going for. Then you have to factor in construction costs. IF (using hypothetical numbers here) you're building a townhome for $250K and it's worth 500K in NY (unsure where in NY the home is), then I would say try to get funding via construction or private loan to (1) pay off the back taxes and (2) secure a developer who can do everything (architectural drawings, permits, build the house, etc). If the land is in an area where multi-family would be profitable (and allowable via zoning codes) then I would say to build the biggest multi-unit possible (3-4 units at least).
Would need to know more specifics to help more, but those are my broad recs.
Selling the land "as is" wont fetch much.. because you have to pay back taxes, then demo/tear down etc could be 10-15K (or more depending on home size, etc) and in the end.. you'll be left with nothing (after closing costs etc). Thus the tear down and building of a new home to sell would be more profitable.