Chicago rises to the top of U.S. cities in percentage of LEED or Energy Star office buildings

Chicago now boasts highest percentage of certified LEED or Energy Star office buildings among the 30 largest real estate markets in the U.S., according to a study published by CBRE Group Inc. and Maastricht University.

About 66% of the city’s office buildings are now certified in one of the two leading green rating systems. Chicago increased its percentage of green office space square footage by 6.5% in the last year, taking the top spot away from San Francisco, which slipped to second place. Chicago’s effort to encourage building owners to add green roofs and to expedite permitting for buildings with sustainable certification, helped it rise in the rankings.

In this year’s annual study, green buildings in San Francisco represented almost 62% of commercial office space. Atlanta, Houston, and Minneapolis rounded out the top five cities for green buildings.

Across the top 30 U.S. real estate markets, the average proportion of green certified square footage is 38%.

New York City has two very large buildings dedicated to answering the 911 calls of its five boroughs. With more than 11 million emergency calls annually, it makes perfect sense. The second of these buildings, the Public Safety Answering Center II (PSAC II) is located on a nine-acre parcel of land in the Bronx. It’s an imposing 450,000 square-foot structure—a 240-foot-wide by 240-foot-tall cube. The gleaming aluminum cube risesthe equivalent of 24 stories from behind a grassy berm, projecting the unlikely impression that it might actually be floating. Like most visually striking structures, the building has drawn as much scorn as it has admiration.