The site plan is posted for the 09/06 AULCC meeting. The elevations are on pages 57-60. The height of the rooftop mechanical and lowest point at ground level are not listed. So the overall height has to be estimated. But 215' seems about right. The start of construction is listed as 10/01.
ftp://ftp.ci.austin.tx.us/ATD_AULCC/AULCC_2018/180906/