In its latest move to let air out of the nation's property bubbles, the Ministry of Housing and Urban Rural Development on April 20 vowed to punish property developers who delay proposed sales dates or "artificially" create supply shortages by faking sales contracts.

Developers must disclose all apartments available and their prices to the public, and start selling within 10 days after getting pre-sale approval, said the ministry.

Prior to this, the State Council on April 15 ordered a 50-percent down payment for purchase of a second home, with the mortgage rates increased to 1.1 times the benchmark lending rates. In addition, it also required banks to stop loans for purchases of a third home.