PNC Bank building a ‘breathing’ skyscraper for its new Pittsburgh headquarters

 Eco-friendly office buildings aren’t exactly unheard of, but we can’t recall seeing anything matching the scale of this skyscraper Hao Ko and his associates at Gensler have designed for PNC Bank. Excavation work has already begun in Pittsburgh, the home of this “breathable” building that will feature a sophisticated double-skin ventilation system allowing fresh air to be pulled in and dispersed throughout its 33 floors — at least when local northeast weather permits it.