AT&T had a very large presence in the Bourse. My maternal grandfather worked there for nearly 30 years. Here's a link with some background and a good picture of its equipment:

https://www.telegraphlore.com/instruments/athearnrptr/bourse.htm

I worked a couple blocks away from here for over a decade. It was a great place to come and have lunch, if you didn't want to sit out in Independence National Park and watch the tourists walk by.

It was built in 1895 and stopped being a commodities exchange in the 1960s. The latest renovation was completed last year. The Bourse still contains dozens of offices on the upper floors but is now noted for having a first-floor food court specializing in artisanal food.

These early architectural photographs demonstrating the expertise of the photographer in camera perspective adjustments and proper exposure coupled with the resolution capabilities of his choice of lens is downright astonishing. Shorpy’s superior transfer to digital is also acknowledged.

[As far as the Detroit Publishing glass plates are concerned, all Shorpy does is spend an hour or so Photoshopping images that were "transferred to digital" by the Library of Congress. - Dave]