As far as call letters: The K-W boundary was originally a line that roughly matched the Texas-New Mexico border. This lasted until the mid 20's when it was moved east to the Mississippi. This is why you see some "W" stations in Texas.
Even after the line move, stations could still petition the government for exemptions. Also, stations that pre-dated the regulations were grandfathered, such as the aforementioned KDKA.
35 years since I graduated college, and I still remember this stuff from the tests (Radio/Television Communications major) 
Finally, GREAT JOB on the building. It looks fantastic.
