That sucks that the owner didn’t even approach you first. You think you’d be the first one he’d tell in case you were an interested buyer.
I’d echo what Greg said. If you like that land, or other local properties for sale, you should at least see if you can wrangle an investment purchase, especially if you can get it on the cheap. Banks do land loans, and sellers will give terms too. You could turn your lease payment into a land payment. Money is super cheap now too. And if something bad in life comes up in the future, you can unload it for more than you paid for it.
It’s worth a serious thought anyways. Especially if you have a close family member to split it with.