According to a report from New York City's Office of Long-Term Planning and Sustainability, some of the city's largest buildings use up to five times the energy as buildings of similar size. The report is part of a wider effort to encourage property managers to take advantage of existing programs and incentives to upgrade their facilities. The New York Times reports:
The reason for the sharp discrepancies in energy use will not be fully identified until the buildings undergo required energy audits, starting next year, but the benchmarking data reveals some patterns. For instance, older buildings of every stripe, even those dating to the early 1900s, performed better than most structures from recent decades. [B]uilding experts say it is likely because they have fewer windows and thicker walls, which provide better insulation.