Pittsburgh's "breathing" building 

The PNC Financial Group hopes to beat LEED Platinum requirements with promoting a healthy indoor workplace with its latest development the Tower at PNC Plaza. Is Located in downtown Pittsburgh on the corner of Fifth and Wood Streets, the building will be about 800,000 sq ft in size with a budget of approximately $240 million dollars. The "breathing" design created by  Gensler moves away from the traditional closed air-conditioned environment and has the aim of becoming the greenest skyscraper in the world.