Quickly it simulated the aging and weathering of such a building. Halfway up, something had punched a large hole, letting in weather. Had a falling, inert warhead struck the building?
The winter storms might well have flooded the basement; such towers of steel and glass, perched near the tidal basin, had to be regularly pumped out. Without power, the basement would fill in weeks.
Winds had blown out windows.
Standing gap-toothed, with steel columns partly rusted, even a small breeze could put stress on the steel. Others would take the load, but if one buckled, the tower would shudder like a notched tree. Concrete would explode off columns in the basement. Moss-covered furniture in the lobby would slide as the gound floor dipped. The structure would slowly bend before nature.