CBRE Group recently announced the findings of their 2015 Green Building Adoption Index, a measurement of the use of energy-efficient buildings among different classes of buildings across the country.

The survey specifically looked at the 30 biggest cities in the United States and assigned rankings to them based on environmentally-conscious certifications, including LEED. San Francisco placed second, just .4 percent behind the overall leader, Minneapolis, and 3.2 percent higher than last year. A press release from the organization stated that this city has “significantly closed the gap” compared to its 2014 performance.

One of the main discoveries of the survey was the prevalence of LEED and green building practices among larger buildings, that is those greater than 500,000 feet, instead of in smaller ones less than 100,000 feet.

The sheer amount of commercial space that achieved LEED status seems to have decreased. Research was conducted alongside Maastricht University, and the release quotes Dr. Nils Kok, a professor from that university, on some of the reasons for apparent changes in the data.

“It appears that some of the buildings that were previously certified did not renew their certification in 2014,” Dr. Kok explained. “This does not necessarily mean that the energy use of these buildings has changed, but that some owners and managers choose not to spend the time or expense to reapply for certification every year.”

According to information from Green California, the state has certified 142 buildings for LEED to date, only a minor increase from the previous year but a continuation of an upward trend that has been in progress since 2003. Of these certifications, nearly 50 percent are silver, and 52 percent are for the LEED New Construction Rating System, also known as LEED-NC.

When planning environmental office solutions for your company, working with a business that knows LEED requirements will help you earn credits for reusing material.