The late 1800s landmark was said to be "the largest and finest office building in the United States" upon its completion.

The exhibition, which will remain on display at least through October, sheds light on this often-overlooked aspect of the history of tall buildings with models, diagrams, photos, drawings, and videos.

In February, New York City Mayor Zohran Mamdani pitched a seemingly fantastical proposal to President Donald Trump to place a structural deck and a 12,000-unit affordable housing complex atop the ...