Threats by major property developers to delay the pre-sales of housing in protest at the Government's anti-speculation measures will not force up the price of second-hand homes, estate agents say. Developers have warned they might wait for residential developments to be completed before offering units for sale in order to avoid the new pre-sale measures. The measures, described by developers as 'unwarranted', require them to put all their flats on the market within six months of obtaining pre-sale consent. Midland Realty managing director Joseph Ling Kwok-fai said even if developers held up their projects, the impact on the secondary market would be limited. He said the number of new units available for sale was insignificant compared to the number of second-hand properties available. 'Our company has closed more than 10,000 property transactions in the first quarter,' he said. He said the total supply of new flats for the entire year was just 25,000. 'A reduction of new unit supply will not push up prices in the second-hand market.'