Here's what I have on the potential new tallest.
The project is named "Astra" and SCB out of Chicago is the listed architect along with CCBG. SCB has some pretty decent stuff, so I think this will be a good design. The addresses listed are 337-377 N. 2nd Ave which is the row of parking lots on the East side of 2nd 1/2 block down from Fillmore. They are pushing for the max height of the lot which is 525'.
I've sent in a public records request once and was sent back nothing but the deed history for these lots. I've sent in a 2nd public records request with more accurate information, so I hope they send me more pertinent info this time. I'll post once I receive it. Here are the fact finding and pre-app for Astra. Project number is 19-1918 for those that want to follow. There is also a sub development permit that was issued back in June. From what I have and from what ljbuild posted earlier and with Aspirant behind this development, I think we may have a good possibility of seeing this built.