There was a post(s) about this being a potential tower site a while back - in the update thread probably. But it's official now because a site plan for a "high rise office tower" project named "Tower 5c" was filed this morning. Specific tower info is not yet available.
https://abc.austintexas.gov/web/perm...pertyrsn=91634
Here's the location from Streetview:
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