What, 4801 West Freeway? That was demolished years ago when they re-routed I-30. (Not the downtown re-routing of a few years back, but the one that realigned everything between Summit and Montgomery (or so.) That's when KTVT moved to Bridge St (30 and Bridgewood area on the east side) at the state's expense. The remains of KFJZ had relocated earlier to 5915 Pioneer Pkwy (SH303) in Arlington sometime in the late 70s, IIRC.
4801 was a beautiful building, from what I've seen in photos (I grew up in Dallas, so that once-a-year ride out to Seminary South never included a trip by KTVT/KFJZ to visit Icky Twerp, no matter how much I begged.) The facility looked WAY too modern and useful to destroy, but that's "progress" for ya.