I like the suggestion to send out neighbor letters to the surrounding property owners. That is a great way to get the word out that you are selling your land. When I went to sell my land, I made sure to tell my neighbors or post of social media and every other platform in order to allow more people to see that my lot was for sale. I ended up way over my original price and with a good buyer that built his family a home there.
This question is out of my realm...but I'm curious why you decided that the current developer is not interested in your property? If his equipment is close... it might not be that hard to deal with your property. Since you already have a house on it, I can assume there's sewage, water, electricity, etc... So your land doesn't need to really be developed, but they could build something nice on it.
"When you walk into a dealership you have a pretty good idea what you want to buy and what your budget is, whether it's $20,000 or $50,000," explains Veissi. "Some people walk out owning a car that they can't afford (and getting financing terms that are not favorable). Often that is because they bring emotion into the buy." In addition, you need to hire professionals with a good track record—an engineer, appraiser, realtor, and real estate attorney. You will avoid a lot of headaches once you start negations, he adds.
Your buyer profile can depend on what type of property you are selling, whether the land has been developed already, its location and market conditions, among other criteria.  Is your likely buyer an individual looking for a lot for a new home? Or is your buyer going to be a builder or developer looking for land for their next project?  Or is your buyer some combination of those, or someone different altogether? There may be different buyers for finished lots, rural acreage or a parcel of suburban land in a thriving new home market.
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