My understanding is that Tillerson fired the 7th floor on Feb. 7, 2017
It goes back to the ‘Height of Buildings Act’ of 1910. In recent years, they have been trying to make exceptions for areas outside of the original L’Enfant plan; but I hope they never allow DC to be made a ‘skyscraper’ city. (I don’t go down to the District much anymore, but when I worked there it was fun to to try and understand how the height of a building related to the width of the street it was on):
https://en.wikipedia.org/wiki/Height_of_Buildings_Act_of_1910