We have been getting offers to buy our land for years...
At laughably low offers. When there is even an offer.
I would guess, we just throw the "offers" in the trash, that there are 4-6 companies sending us the "offers."
Recently, a local real estate broker mentioned that they were looking for land for a client who is a "developer." Our land fit the bill, so to speak, so we contacted the broker. Said broker said they would provide comparables and get back to us. Get back to us they did, but no comparables, and said the buyer was looking for land that is less than that the tax valuation and that they had found something.

Broker asked, again, what we would take for the land.

We ignored the question. My guess is they DID do the comparables for our place and figured out they could not afford it AND/OR they are looking for people ignorant of land prices.
We have been watching the land market for years and the market really has heated up. There is very little on the market, I suspect what shows up, gets bought up, ASAP. What little I do see on the market is not even remotely comparable to our land at all AND very expensive.
Our house in the city is now supposed to be worth twice what we sold it and it is a simple track ranch. Nothing special.
Later,
Dan