Glad you mentioned that NOYB, I was able to pull a few images from the archive. Asterisk being that shots at night before there was decent daylight are iffy, and it was far enough away that it isn't as perfectly clear as one would like... but its plenty to get an idea of how they did it from 7:15AM onward at least. A bit of a time-lapse video is embedded below. Here's my account based on the pics of two separate sections of the building that were moved and the time stamps that were on the images:
At 7:16AM you can see the first of two sections coming North on the 18th st bridge in what would typically be the Southbound lane (traffic of course directed accordingly).
By 7:46AM that first section had cleared the bridge
At about 7:53AM you can see the second section starting to come North on 18th toward the bridge
By 8:11AM that first section was taken and left stationary about I'm going to guess the equivalent of a city block West down Grand Valley road
By 8:46AM the second section clears the bridge
At about 8:50AM traffic looks like it was opened up again on the Southbound lane of 18th st
At 8:51AM the second section has met up with the first section on Grand Valley Road
At 8:57AM both sections are towed West down Grand Valley road out of the frame of the camera.... never to be seen again
Here's the time-lapse. Might need to click to make it full screen by using the icon at the very bottom-right: