(b) 北楼能耗量比现有条件下的能耗量减少 40%，为此更新过时的主要建筑系统，包括机械、电力、低压配电、管道、输送和垂直运输系统，以达到行业标准和符合建筑规范，并延长北楼使用寿命；
(b) To reduce the North Building’s energy consumption by 40 per cent as compared with existing conditions, by modernizing outdated major building systems, including mechanical, electrical, low-voltage, plumbing, conveyor and vertical transportation systems, so as to meet industry standards and code compliance and extend the building’s useful life;