This building was built in 1959 to house the extensive, and historically important, library of the American Philosophical Society. Its Fifth Street façade is a re-creation of the building built in 1790 to house the Library Company of Philadelphia, the subscription lending library founded by Benjamin Franklin and others. This building, along with the First Bank of the United States, the central pavilion of Pennsylvania Hospital, and Woodlands in West Philadelphia, demonstrated clearly that Philadelphia had embraced the new Federal style.