Here is the site plan for the earlier version. This is probably where the old 273 foot height came from. That height was to the main roof, and this version only had 19 floors. The mechanical screen was actually higher than 273 feet. I measured it to about 27 feet, which would bring the height to 300 feet. That makes sense with it having 19 floors instead of 20. Another floor would have added 15 feet which is close to the 20 floor version that's being built.
https://sanantonio.legistar.com/Legi...tions=&Search=