Pitfalls Of buying common areas at tax sale

[Ben Martorano]

I am considering bidding on a piece of land at a tax sale. It is in a subdivision and it looks like a piece of land that was at one time a common area (or intended to be). My play would be to buy it and offer it back to sale to either the association or one of the homes that it borders as it would extend or double the size of several back yards. It also looks like there is a small shed partially on it. 

Any questions concerns or pitfalls? Thanks