A PROMISE by the Government to build more flats was meaningless unless land was provided, a legislator said yesterday. United Democrat Lee Wing-tat said land for public housing did not need endorsement by the Sino-British Land Commission and so more could be granted. The Government has pledged to set up a multi-billion dollar fund under the Housing Authority to build 10,000 more flats. ''Without promises from the Lands Department, those who are most in need of public housing, such as tenants on waiting lists, or the caged men in some private flats, will continue to suffer,'' he said. Mr Lee said the authority's huge accumulated surplus was only ''an illusion'' because of a land shortage. Deputy Secretary for the Treasury, Stephen Selby, said search for suitable land was hampered by environmental and traffic problems. He hoped the fund would provide the authority with greater flexibility to resolve such problems. The target of 10,000 flats a year was only an estimate, he said. There was no timetable for the Government to provide the 58 hectares sought by the authority. Director of Housing, Fung Tung, said the authority had the financial strength to meet the target set out by the Government. Bill Lay, spokesman for the Social Workers' Concern Group on Private Block Re-development, urged the Government to reduce the amount of land put to public auction and allocate more to the authority. But Mr Selby said the amount of land auctioned did not affect the supply for public housing because the authority's needs were considered first.