Here's what I'd do, if it were my building.
50 years ago, the tallest building in town was the late CNB Building, topped by that enormous rotating digital clock which was a tremendous source of civic pride. I remember reading on here that it was possible to read the time on it from several miles away. See where I'm going? Why not re-create the clock atop Burnett Plaza's elevator penthouse?
It wouldn't need to be an exact replica -- for one thing, CNB isn't around anymore, and for another, there have been 50 years of technological advances that could go into a new clock (LED lights, for example). But it could certainly be designed to look and feel like the old one did.
If I'd been a kid back then, I would have thought that clock was the neatest thing in the world. As it was, I had to settle for the smaller display atop the 12-story "Big Blue" building in downtown Wichita Falls, not all of whose bulbs seemed to be in working order half the time. Sadly, we hardly ever went to Fort Worth when I was a kid, so I never got to see it for myself. But how cool would it be to bring back a beloved piece of Fort Worth history?
Just imagine this on top of Burnett Plaza....