[nicknow]

We need to be careful here. Because we still want people to sell off potentially productive land. Lets say I buy two lots along a highway with growing traffic because I believe in the next 5-10 years it will be a good spot for a gas station/convenience store.

So now 5 years later the highway is developing and I build out my location. I decide I want to sell the other lot since I'm not going to build on it.

Now, I don't need to sell it. I could hold on to it, it's not that expensive to own. It would be a great spot for a fast food joint or what not. But I don't want to sell it to someone who immediately develops it as a gas station.

The public would benefit from developing the land - new services and more tax revenue. So it's in the public's interest for the owner to sell.

So you want to allow some amount of anti-competitive restrictions. I get not wanting permanent non-removable restriction.