My office caters an event for the fourth. Great view of the Mall from a balcony on the top floor. So popular you have to sign up for a raffle to get a spot.
I used to spend some evenings/weekends in a giant empty NYC office building, perhaps stupidly if not psychopathically.
In one case, my plan was to drop by and grab some work to take home; my purpose, it seems, was to discover a ginormous flood starting one floor above, and alert the authorities.
Is that the new building? Looked nice when I was there for an alumni event though I'll always think fondly on my classes in a windowless room in the car barn.