I worked on the 4th and 5th floor of this building for a few years, and there’s no reason why would want this building at a time when there is plenty of space on the market. The bottom floors were designed to be a 1970s data center, and so the city block sized floors only have windows on only one side. So during the winter months when it gets dark early, you might not see sunlight on weekdays except during your morning commute.
The plus side of this building is that it is one of, if not the most, seismically safe building in the city. So if you’re optimizing for that, you can probably get a great deal right now.