A LEADING property firm has hit out at the Government over new rules which it is claimed could drag down the level of building management in Hongkong. Alan Constable, of Urban Property Management, claimed parts of the recently enacted Multi-Storey Buildings Amendment Bill were ''seriously flawed''. And he believed the quality of management services in the territory would slump unless changes were made. He said: ''Twenty years ago the standard of management of private housing, apart from the luxury sector, was a joke. ''There were many problems. But a system has been developed in Hongkong which I think is the best anywhere. ''It would be very sad to see the situation which created this very high standard being destroyed.'' The clause in the ordinance causing the controversy states a property manager can be dismissed without reason by owners with a 50 per cent share of the building. Mr Constable fears the new system will suffer more problems than the previous one which was built on ''trust'' between owner and manager. He has urged the Government to change the role of the tribunal set up to solve disputes between the two parties. ''Before it [the tribunal] came in, we thought it would be there to look closely at both sides and decide if the manager was unfairly dismissed. ''But it seems that if the estate manager appeals to the tribunal and, if it is found the owners did everything by the book, then that is it.'' Mr Constable, a director and general manager of the firm which was the founding member of the Hongkong Association of Property Management Companies, believed standards would suffer. Estate managers would be reluctant to carry out any long-term projects. The first area to be affected would be preventative maintenance. ''What is worth $1 now may be worth $10 in five years' time. ''But some owners might not want to pay when they don't know if they will still be there to see the results.'' Mr Constable said disputes often arose when the manager raised his fee. The new legislation would make it easier to force lower charges - but would also lead to a drop in quality, he said. ''The owners' corporation I have dealt most closely with over the last 20 years has worked well. ''I listen to what they have to say, and then I may suggest that the work needed is essential. ''They normally go along with it because they know me. Many of the people who are on owners' corporations are the salt of the earth. ''I am just frightened the bully boys will move in because there is a lot of money in it.'' The company, created in 1981, celebrated its residential portfolio reaching 50,000 units last week.