[AnthonyMouse]

> What increase in price?

The increase in the value of the land when it's rezoned.

Suppose you have a house currently worth $500K because it's only zoned for single family homes. Rezone that area for higher density and developers could be willing to pay you $700K or more for the land so that they can build a dozen condos on it, sell them for $300K each and get back $3.6M. It's worth more after the rezoning because they weren't allowed to do that with the land before.

Then you take your $700K, buy a $500K home similar to your original one in an area still zoned for single family homes and have $200K left over for whatever you like. Or maybe you have $300K left over because you only have to pay $400K for that single family home once there is less housing scarcity because there are now lots of new condos ten miles down the road where you used to live.