In 1908, the New York Curb Market Agency was established, which developed appropriate trading rules for curbstone brokers under "curb agent" E. S. Mendels. In 1910, Mendels testified before the Wall Street Investigating Committee on behalf of the curb brokers, when an attempt was made to dislodge them from Broad Street. In 1908, 70 Broad Street, between Marketfield and Beaver Street, became the American Bank Note Company Building, the headquarters of the American Bank Note Company. Built in 1913, 23 Wall Street or "The Corner", is an office building formerly owned by J.P. Morgan & Co. – later the Morgan Guaranty Trust Company – located at the southeast corner of Wall Street and Broad Street. So well known as the "House of Morgan" – that it was deemed unnecessary to mark the exterior with the Morgan name. In 1920, journalist Edwin C. Hill wrote that the curb exchange on lower Broad Street was a roaring, swirling whirlpool” that "tears control of a gold-mine from an unlucky operator, then pauses to auction a puppy-dog. It is like nothing else under the astonishing sky that is its only roof.” After a group of Curb brokers formed a real estate company to design a building, Starrett & Van Vleck designed the new exchange building on Greenwich Street in Lower Manhattan between Thames and Rector, at 86 Trinity Place. It opened in 1921, and the curbstone brokers moved indoors on June 27, 1921.