The Ellicott Square Building in Buffalo, New York where Tesla lectured

The Ellicott Square Building in Buffalo, New York, 1896. It was claimed that, at the time of its completion, this was the largest (not tallest) office building in the world. It had 447,000 square feet of floor space and an interior glass-covered courtyard. 4000 to 5000 people worked in the building, which contained 5500 tons of steel and had 16 Otis hydraulic elevators. The first floor contained stores, the second floor contained banks and other offices that wanted impressive 14' ceilings, the third through ninth floors contained offices, and half the tenth floor was a business club.