Impose a limit where the developer must build on the land that they acquire

I am not sure if there is such a limit in place but quite often, I've seen news where URA and HDB have announced that they have sold so and so land parcel for x million. However after that, there is no news on the construction until much later.

I believe there lies the problem. The government may be using the land sales as the reason that the developers are well-supplied but the problem is that the developers are sitting on the land, doing nothing. What matters to us is that houses are built, and not the land that is sold. That piece of land means nothing to us.

We all know the reasons why developers are sitting on the land. Waiting for the right moment to launch their property so that they can make a fat handsome profit, etc. Imposing a time limit whereby developers must start construction of their properties will help in preventing excess inflation of property prices because the developers will bid cautiously in view of this time limit. This will also prevent excessive houses being built in a certain quarter as the respective authorities can space out their land sales so that a certain number of houses are available every quarter. This will in turn prevent excessive rise in prices.

I still think the property prices are crazy. An executive condo costs more than a condo?? Then the government might as well take over all the housing construction.