The Goldtex apartment community in the Loft District just became the first LEED Gold certified residential high-rise in Philadelphia. The Post Brothers development company announced the certification for the building yesterday in a press release, noting that Goldtex saves about 15 million pounds of CO2 each year—that's about how much 1,200 cars emit. OK, but what exactly about the building's redesign earned the nod from the US Green Building Council? Well for one, Goldtex runs on 100 percent wind-generated power. The building's new facade also creates an insulating thermal barrier by using the original shell as a heat sink, according to the release. Then, there are the windows, which feature electronically-controlled shades, as well as heat-blocking coatings, which help the building both consume and retain energy. Plus, every apartment has Energy-Star appliances and LED light fixtures.