The brick house at 21 Park Street in Florence in Northampton was built in 1846 by Hall Judd, a founder and last secretary of the Northampton Association of Education and Industry. Part of the communitarian movement of the nineteenth century, the NAEI was a utopian community that was dissolved the same year that Judd was building his home. From 1851 to 1894, the house residence to (his widow?) Frances P. Judd. Dormer windows and a wraparound porch were added to the house around 1910. The house has a hidden staircase that suggests it was used in the Underground Railroad.