Developments above Hollywood Road, including the Central School site, should be low density to preserve the integrity of the last two low-rise districts in Central, an architectural study says. The study, conducted by Chinese University, analysed Central's cityscape using aerial photos and identified small districts that were worthy of preservation. 'The two groups of post-war buildings in Tai Ping Shan Street and Graham Street are the last two low-rise areas to be found in Central,' said Woo Pui-leng, an associate professor of the university's department of architecture, referring to tenement buildings of four-to-six storeys built after the second world war. 'Instead of forcing people to walk inside huge structures, the two areas are still full of street life with small shops and neighbourhood activities,' she said, adding that Yu Lok Lane and the Staunton Street neighbourhood would soon be replaced by high-rises in renewal projects. The development approach to areas above Hollywood Road was critical because these areas, including the former Central School site, linked the two low-rise districts. But recent redevelopments taking place between the two areas had destroyed the integrity of the low-rise cityscape. 'The high-rises that have recently popped up have blocked the visual corridor between the two areas and people can hardly walk from Tai Ping Shan Street to Graham Street now,' Dr Woo said. She said Wing Lee Street - part of the Staunton Street redevelopment project - was the main passage through the two low-rise areas, and urged the Urban Renewal Authority to improve the connection and urban design of the project. 'Post-war tenement buildings of human scale are an endangered species in the process of extinction,' said adjunct associate professor Yuet Tsang-chi, who also participated in the research, adding that they were integrated places for life and work. An exhibition illustrating the transformation of Central is now open at the Conservancy Association Centre for Heritage and features models of the two low-rise areas.