HDB明确规定：
HDB may require the seller and/or the buyer to furnish a written explanation on the difference between the declared resale price and the prevailing market valuation of the flat if the declared price is below the prevailing market valuation.
If the reason(s) given for the difference between the declared resale price and the prevailing market valuation of the flat is/are deemed not acceptable by HDB, HDB may withhold approval or cancel the resale application.
