According to  a new study, Atlanta is one of the most environmentally friendly cities in the country when it comes to office buildings.

The fourth annual Green Building Adoption Index a study conducted by researchers at the Commercial Real Estate Services (CBRE) and Maastricht University in the Netherlands — showed that more than half (55%) of Atlanta’s office space is “green certified,” either through the USGBC LEED program or through Energy Star.

Out of the 30 largest office markets in the United States, Atlanta ranks third on the list of eco-conscious office spaces, following San Francisco (#2) and Chicago (#1). Almost 25 percent of all offices in Atlanta are Energy Star labeled—second only to Manhattan and nearly double the national average.

In 2015, the city of Atlanta adopted the commercial buildings energy efficiency ordinance requiring that commercial buildings spanning at least 25,000 square feet, must annually measure and publish their energy and water use. The goal is to see a 50 percent reduction in CO2 emissions from commercial buildings by the year 2030, according to Atlanta mayor Kasim Reed.

Less than 5 percent of U.S. office buildings in 2005 were certified as “green” or “efficient,” researchers wrote. Since then, the statistic jumped to 38 percent. The CBRE study confirmed that institutional owners of office buildings continue to pursue green building certifications in the 30 largest U.S. markets.

As the trend for green design and renovation continues, clearly, these top 30 cities nationwide are receptive target markets for all those in the sustainable, environmental building and design sectors.