I was program director of KEGL when we moved it first from Fort Worth to Arlington (on Pioneer Parkway, across the street from the Lake Arlington dam), and then to the Urban Center in Las Colinas (Irving).
KEGL's city of license was (and is) Fort Worth.
Upon our applying for it, the FCC granted the station what's known as "The Arizona Waiver," allowing the station to locate its studio operations outside the city of license. (Hard to believe, but back in the day, you had to get this Arizona Waiver from the FCC to be able to broadcast from elsewhere but your city of license.)
I think in hindsight, the move to Arlington was more about Gery Swanson wanting to sell the station, and figuring that it would bring more if it were in its own building. That move was as much about getting us out of the old Channel 11 building on West Freeway (I-30 and Hulen) as it was about moving to Arlington.
But the move to Las Colinas in Dallas County was expressly for the purpose of getting our sales operation (and frankly, the entire operation) closer to where the most market dollars were. Prior to the move to Las Colinas, KEGL had always operated a satellite sales office in Dallas. Not only did that add operating cost, but it also caused some operating complications. Sales people would bring back tapes of commercials and they had to be shuttled clear across town just to get them on the air. This was before the days of digital audio and the internet.
The move to Las Colinas enabled the station to have ONE base of operation for all departments. And it put us in much closer proximity to where the dollars were.
It's radio, man. It's always about the money. Don't you know that?