Controversial plans to demolish and redevelop the west wing of the former government headquarters in Central could be blocked after antiquities advisers decided to rate the historical value of the entire complex - the west wing, east wing and main building. Chairman of the Antiquities Advisory Board Bernard Chan said yesterday the rating would be conducted by a panel of professionals and historians and would take two months, after which the board could endorse or change the rating. 'I believe the government will respect the board's arrangement,' Chan said. 'There's still plenty of time before the redevelopment of the west wing starts in 2013.' A board member specialising in architectural conservation, Lee Ho-yin, said: 'The three government blocks should be seen as one totality as they were planned together by one architect. They were just built in different phases.' Tom Ming, executive secretary for the Antiquities and Monuments Office, said the term 'Government Hill' had appeared on government documents since the 1840s but the existing government complex was built a century later in the 1950s. While the government plans to preserve the rest of the area known as Government Hill, it plans to knock down the west wing and replace it with a commercial development. The decision was made yesterday as concern groups urged Antiquities Advisory Board members to preserve Government Hill - including the complex - by giving it a historic rating. But Chan said the existing grading mechanism rated only individual buildings and did not apply to cultural sites. The board had already requested the government study how it could be done. Meanwhile, three young French architects and a local artist have come up with an alternative proposal for the west wing. Poppy Floyd, a French architect who moved to Hong Kong and set up a practice about a year ago, said she could see possibilities based on her experience working on the revitalisation of post-war social housing complexes in Le Mirail, outside Toulouse. She conducted an urban case study for a housing block called Petit Varese, and helped organise a public debate over the redevelopment. Dubbing their proposal 'Second Life Project', her team suggests the wing should be renovated as a mixed-use centre to bring diversity to Central, including exhibition areas, design studios, an avant-garde cinema, halls for high-profile conferences and ceremonies, and education spaces.