There are a number of differences. The top level is different: the render was all glass, the build is not. There are no windows to a basement level. And the third level corner doesn't have that little step back on the east side.
Those half-windows are weird, but maybe there's reason for that. Stairwells and elevators?
Oh well. Given some of the uglies that have gone up in this town, I don't think this will rank among the worst. Hopefully whatever exterior colour treatment is applied will bear that out.
If only it had cornices.