First Union Bank Building in Savannah

[banctech 0]

As a frequent visitor to Savannah, I have always admired the First Union Building in downtown Savannah not just because it appears to be the tallest, but also because of the details in the north,south, and western sides. However, I can't help but wonder why the east side is so plain and actually ugly. It's as if the original architects were counting on a future addition or at least a neighbor of equal height in the near future that obviously never happened. I always approach downtown from Wilmington Island, so the first thing I see of downtown, is that ugly side of an otherwise handsome building. Does anyone know the story here and why it was designed this way?