Which 1891 lecture venue in New York hosted Tesla's high-frequency demonstrations?

The 1891 lecture venue in New York that hosted Tesla’s high-frequency demonstrations was Columbia College.

On May 20, 1891, Tesla presented “Experiments with Alternate Currents of Very High Frequency and Their Application to Methods of Artificial Illumination” before the American Institute of Electrical Engineers. Columbia College, now Columbia University, provided the New York setting for the lecture.

Tesla used resonant electrical circuits to generate extremely high-voltage, high-frequency alternating currents. His demonstrations included luminous discharges, glowing tubes, induction effects, and lamps that could operate with unusual wiring arrangements. The apparatus contained the essential elements of what became known as the Tesla coil.

A common mix-up is confusing the venue with later institutions where Tesla lectured. He demonstrated related work in London, Paris, Philadelphia, and St. Louis during the early 1890s, but the landmark 1891 New York presentation was at Columbia College. The event helped introduce his high-frequency research to the American electrical engineering community.