Alexander Hamilton's home site is on Walnut Street in Philadelphia, Pennysylvania. The Secretary of the Treasury lived in a house on this site in 1791. Due to the residence law passed by Congress in July of 1790, all federal government offices were forced to relocate to Phialdelphia, the new interim capitol of the country. Hamilton found a home for the Treasury Department on Third Street, between Chestnut and Walnut. He procured a house for himself on what was 79 South Third Street, near Walnut, just a block away from his offices. It was also here that Hamilton began a notorious affair with Maria Reynolds, a supposedly spurned wife who required his gallant help. She would become his mistress until early in 1792. There is a plaque on the front of the Nelson Building, which stands on the site of Hamilton's former home, indicating his brief associate with the place.