My In Detail article in the current issue covers Rafael Moneo's Northwest Corner Building at Columbia University. In addition to filling the final vacancy in the 1890 McKim, Mead & White master plan, the building had to bridge a subterranean recreation center with a 120-foot clear span. In answer, Moneo—along with executive architect Davis Brody Bond Aedas and structural engineer Arup—designed the building's steel framing system as one big truss, with diagonal members bolstering the perimeter moment frame. The majority of the gravity loads, however, are supported by three gargantuan trusses that run the length of the building four levels above the street. These trusses are so big and heavy that Turner Construction had to assemble them on site, on a shed built above the sidewalk, and then slide them into place. The above stop-action video was also assembled by the construction manager, documenting its elegant solution to this seriously heavy erection.