Developers who plan to put up buildings with 'intelligent' designs or elderly-friendly facilities may enjoy concessions on land premiums, Director of Buildings Leung Chin-man said yesterday. After officiating at a department open day, Mr Leung revealed a plan to commission a consultancy study this year to identify where financial incentives could be offered to encourage developers to construct such buildings. The study would also develop a voluntary design manual for such buildings, Mr Leung said. The proposal follows previous initiatives last year, when the department exempted green facilities, such as balconies and sky gardens, from their gross-floor-area calculations. Overseas buildings had increasingly adopted power-saving devices, such as an automatic shutdown of power when facilities such as lifts or lights were not in use, he said. These so-called intelligent buildings will require extra space for the laying of optical fibre but these areas may be exempted from gross floor areas, Mr Leung said. In terms of buildings designed for old people, they would tend to have bigger lifts, anti-slip floors and toilet handrails, he said. In other cases, buffer areas would be built for elderly people with walking difficulties or where those in wheelchairs could wait for help if needed. These extra areas may also benefit from gross-floor-area exemptions, pending the results of the consultancy study, he said. Meanwhile, thanks to the contracting out of urgent work, the department would be able to demolish 30,000 illegal structures this year, Mr Leung said.