The winner of this challenge will certainly be the informed individual.
Many times when there's a piece of property that needs to be unloaded, you can extract a lot of favors from the municipality such as No Tax for 10 years, as well as other creative things.
However, it could be an opportunity of a lifetime, but you need more time to investigate.
I suggest trying to make a simple agreement to take the property off the market for "X" amount of days, for a sum of say $50 or $100 bucks. If you decide not to buy the property, they keep the money. If you buy it, the money goes to them, and you kick in one dollar more.
This way, you preserve your opportunity while
giving you the necessary time to investigate.
EDIT: In real estate, this is similar to an Option Agreement. However, there is no need to call this an Option. Just call it an agreement to take the property off the market for some period of time.