Just thought I'd upload my own renderings here (albeit amateur) to help clarify the height a little. This was rendered at around 334 feet above ground which is roughly where the roof height is. The thing about the Marriott Riverwalk is that I'm sure its "official" height is inclusive of its Riverwalk levels, which is what makes its apparent height from street level a bit misleading. (It could be closer to 350ft when you measure from that point). Also, I think the Grand Hyatt is around 425' to its crown so this tower should measure up correctly based on the submission document.
(I rendered the hotel at around 216 feet but I still have no clue on its official height)