Sometimes the false is truer than the true. It is not possible to get a good picture of One PNC Plaza from the ground. The only way to get in the whole building—well, almost the whole building—was to stitch together multiple pictures, which produced a hideously distorted perspective. To create a rendering that looks more like what we perceive (which is not the same as what we see) when we look at the building, old Pa Pitt resorted to complicated trickery for the picture above, making four vertical slices of the picture and adjusting each one of them separately. If you look at the ground level, you can see how everything else has been broken and distorted to make the building look more like itself.
Here is the base of the building without the radical distortions.
One PNC Plaza was designed by Welton Becket and Associates; it opened in 1972. Mr. Becket died at the beginning of 1969; but it is probable that he left drawings of this building on his drafting table, since it had been planned before 1968. The firm continued under his name long after his death; One Mellon Center, which opened in 1980, was also designed by Welton Becket and Associates.
It is a curious fact that One PNC Plaza replaced another skyscraper that was shorter by only four floors: the First National Bank Building, which was designed by Daniel Burnham and ranks at number 35 on Wikipedia’s “List of tallest voluntarily demolished buildings.” It is the tallest building destroyed in Pittsburgh so far.