A group of property owners yesterday urged the Government to investigate whether maladministration was involved in a Mid-Levels land use dispute. The call followed last month's ruling by the Privy Council in London on a developer's high-rise project on a designated low-rise site in Hing Hon Road. The Government turned down Ryoden Development's plan to put up a 25-storey building on the lot in 1993. It said Ryoden had contravened the original lease, which was restricted to the building of villas only. But the Privy Council said the Government should not ban the project. This was because it had failed to enforce the lease's restriction when a six-storey block was built on the lot in 1957. The 200 affected flat owners on the Ryoden site demanded the Government remove the restriction in the land lease immediately. Urban Councillor Chan Kwok-leung said property transactions in the lot had been frozen and the market value of the flats had dropped by up to 40 per cent since the land use problem emerged. 'The Government should investigate if there is any maladministration involved,' Mr Chan said. One of the owners, Folk Mak Fuk-hung, said the court ruling would have huge implications. The Government should check to see whether there were similar problems with other sites, to prevent property owners or potential buyers suffering. 'We paid the market price for the flats,' Mr Mak said. 'But suddenly we were told our flats had problems.' Following the Privy Council decision, Ryoden will be able to press on with its development without paying extra land premiums.