Chicago’s offices have gone green. The windy city now has the highest percentage of certified LEED or Energy Star office buildings, 66 percent, among the 30 largest real estate markets in the U.S., according to a study published on Thursday by CBRE Group Inc. and Maastricht University.

Chicago increased its percentage of green office space square footage by 6.5 percent in the last year, taking the top spot away from San Francisco, which slipped to second place in the annual study. In San Francisco, green buildings represent almost 62 percent of commercial office space.

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