Speaking of the blank wall on the North side of the tower, it reminds me of another iconic building in town with an ugly blank wall. The PSFS building looks great from all sides except for when looking directly at its south side. There is a tall, black, blank wall that looks hideous and every time I see it I think the southern exposure must make that wall super hot when the sun is beating on it.
Picture courtesy of http://philaphilia.blogspot.com.
It’s interesting how few pictures there are of the PSFS building from due south.
To a much smaller extent there are a couple of mid rises in Old City which also have southern blank concrete walls. Not my favorite for sure.
My guess is that the W puts some sort of cladding over the blank concrete.