Have to keep in mind that the Washington Monument is just a skinny tall pile of stones, there is no structural frame. Gravity and stone mass are what keep it place since they started construction in 1848.
With a height of 555 feet the lateral movement is a lot greater the higher one goes. Wouldn’t be surprised to hear of cracks.
Just a few minutes, radio announcement said all buildings on the mall have been evacuated.
IIRC, the Aerospace museum on the mall has a huge glass front wall....