well, just looking visually at the rendering, i can tell something is wrong. 1522 on the lake, the building on the left in the image below, is 192'. there is no way that the transera, as depicted in the rendering, is 233' taller than 1522. for the 425' figure to be correct, the transera would have to be more than twice as tall as 1522, which is clearly not how it's shown. either the building has grown or the height figure is wrong or the rendering is inaccurate/outdated.
based on this rendering, and 1522's known height, my best guess would place the height of the transera in the 300'-325' range.