here it is in 2008 lit up for the Festival of Lights.
Background
Peregrines were first noticed downtown in winter 1989 - 1990. To provide a breeding site for these birds, nest boxes were installed
at the Gulf Tower in 1991 by the Western Pennsylvania Conservancy (WPC). One was put on the south side of the building, the
other on the north side. The birds bred in a nest box the first year they were put up. Over time both nest boxes were used, although
it appeared that the peregrines initially preferred the north box facing the Allegheny River. Because the north box was used
more frequently, the south box was removed when it started to deteriorate.
There's 42 stories the falcons utilize the 40th floor North side
For those who didn't see this, here's some of "Beauty's" baby pics on Imprints
http://rfalconcam.com/imprinting/?p=725