The site plan was released today for the Block 23 office building. The elevations are shown on pages 25 through 27.
ftp://ftp.ci.austin.tx.us/ATD_AULCC/...20LA_PLANS.pdf
The heights are:
397 feet 6 inches to the mechanical penthouse. This is the highest point on the building.
344 feet 6 inches to the 28th floor. This is the highest occupied floor.
There are also 3 more levels above the 28th floor that are mechanical levels.
387 feet 6 inches to the 31st mechanical floor.
373 feet 6 inches to the 30th mechanical floor.
359 feet 6 inches to the 29th floor (main roof) parapet.
357 feet 6 inches to the 29th floor (main roof) slab.