3. 正如秘书长上一份报告所述，项目包括一个一次性基本建设翻修项目，其 20年期总体拥有成本，与分阶段将大楼局部升级的做法比较，将节省约 15.5%。此外，项目还将建成一栋“净零”1 大楼，可大幅减少(零)能源消费，降低长期维修费用和带来延长大楼使用寿命 40-50 年的额外好处。
3. As described in the previous report of the Secretary-General, the project consists of a one-time capital renovation project that would result in a total cost of ownership over a 20-year period that would be approximately 15.5 per cent less costly than a phased, partial upgrade of the building. In addition, the project would provide a “net zero” 1 building, with a significantly reduced (zero) energy consumption, lower ongoing maintenance costs and the added benefit of extending the useful life of the building by 40–50 years.