Hello with all of the commotion on house sellers/buyers why not just add a random timer on the house after it is demolished. When the house is demolished it would be put back on the market at a random time within the 24 or 48 hours. This way it will discourage the buying/selling between players and gives a fair chance for anyone to buy a house when the timer run up.

People will stop buying up all the land because in order to resell it the buyer has to be watching their computer screen anywhere between 1 to 48 hours. The sellers will have a hard time finding buyers with this kind of rule since the buyer will risk loosing if they log off because of work, school or any reason they might walk away from their screen.

BTW this rule would only apply when someone demolishes their home and not when SE releases new plots to buy.