The 18th & Congress site, if you remember, is the surface lot where the Austin Planetarium attempted to develop a new science & technology museum in conjunction with a 45-story (or so) condo tower.
The lot covers almost 2.5 acres (or just under 109,000 SF). Even though the new building is proposed to be roughly 650,000 of office space, there is a good chance it will not be very tall. It might just be a 6-10 story square-block-sized cube (height could change depending on parking - podium garage or subsurface).
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AUSTIN (City): 979,882 +1.87% - '20-'23 | AUSTIN MSA (5 counties): 2,473,275 +8.32% - '20-'23
SAN ANTONIO (City): 1,495,295 +4.23% - '20-'23 | SAN ANTONIO MSA (8 counties): 2,703,999 +5.70% - '20-'23
AUS-SAT REGION (MSAs/13 counties): 5,177,274 +6.94% - '20-'23 | *SRC: US Census*
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