This all boils down to how badly the developer needs your home, how much money he stands to gain by moving quickly and how robust the multi-unit housing market is. If the final offer falls a bit short of where you’d like it to be, factor in the negatives of staying: more construction noise, additional traffic and all the dough you’ll have to fork out to comfortably remain there. Realize, too, that condo prices, in particular, can be mercurial and turn on a dime if the greater housing market starts going south, which might give your buyer cold feet.
A farmer may want to expand his or her land, and your 3-acre lot is perfect for grazing. If you have land that is in a residential area, your neighbor may want the opportunity to have a bigger property and will buy your land for premium since it is adjacent to their land. And these are people you probably know and trust, which makes the entire sales process more pleasant.
If you want to investigate the situation on your property, you could always order an environmental report. They can either do a high-level look at it (without doing any soil sampling), or they can drill soil borings to verify if there are any chemicals in the soil (which of course, will cost more). I’m guessing you could find out more on whether or not it’s an issue to be concerned about with a quick phone conversation.
First impressions are lasting in real estate. When selling a home you would never leave out your dirty laundry for potential buyers to see, and you should also clean up your lot before it is shown and marketed. Cut the grass (or weeds), remove trash and take marketing photos of your property when it is looking its best. Some sellers even plant wildflowers to make their vacant land look beautiful. It’s like staging a home, but you’re just working with raw land instead.