[estearum]

> Vacant land that's desirable is often held back from development due to zoning or infrastructure issues.

Nah, it's mostly speculation. Zoning/infrastructure issues get baked into the price. If you cannot build anything on a plot of land, its price falls.

[philipallstar]

Only at point of buying. If you buy some land and the mayor suddenly implements rent control then the value goes down.

[bpt3]

Until someone gets the zoning board to wave a magic wand and change the allowable uses of the property, and then it's a lot more valuable.

This happens all the time, and is a major reason why people will sit on land for extended periods of time.