Which neoclassical building in Philadelphia was designed by William Strickland as a merchants' exchange?

The neoclassical building in Philadelphia designed by William Strickland as a merchants’ exchange was the Merchants' Exchange Building.

Built between 1832 and 1834, it stood on a triangular site bounded by Dock, Third, and Walnut Streets in Philadelphia’s Old City. The unusual plot shaped Strickland’s design: its curved rear façade followed the nearby road, while its Corinthian columns and classical ornament expressed the Greek Revival style.

The building housed brokers and other commercial groups, including Philadelphia’s Board of Brokers. It was an important center of nineteenth-century trade, though the Philadelphia Stock Exchange later moved elsewhere and eventually adopted its modern name.

A common mix-up is the nearby Second Bank of the United States, which Strickland also designed. That building is a separate Greek Revival landmark on Chestnut Street. The Merchants' Exchange Building survives today as part of Independence National Historical Park and was designated a National Historic Landmark in 2001.