Houston's still one of the greenest office markets in the US, according to CBRE and Maastricht University's newly released 2015 Green Building Adoption Index, but we have dropped a rank. In 2014, Houston was fourth in the country with 55% of our office product Energy Star or LEED certified. This year, we've slid to fifth, with 53% of offices certified. The report finds that green certification is primarily a big city, big building phenomenon—only 4.5% of all buildings less than 100k SF qualify as green, compared to 62% of buildings over 500k SF. But even those larger cities and properties are slipping a little in their growth of green initiatives; Houston isn't the only market whose percentage dropped, and the report found that some buildings certified in 2014 didn't re-up. That's probably an indication that owners didn't spend the time and money to get recertified, not that the buildings became less sustainable.