One of the biggest architectural losses in New Haven was the 1957 demolition of the Town-Sheffield Mansion, formerly on Hillhouse Avenue. The mansion was built around 1836 by esteemed American architect and civil engineer Ithiel Town (1784-1844) as his own home on Hillhouse Avenue in the Greek Revival style; here he kept what was then an extraordinary architectural library, which was said to have been larger than any other personal collection anywhere at the time, including that of Sir John Soane in London. After Town’s death, the house was bought by Joseph Earl Sheffield in 1859, benefactor of the Sheffield Scientific School at Yale, and modified by local architect, Henry Austin in the Italianate Villa style. Alterations included two large asymmetrical towers, a new porch, and symmetrical side wings with large bay windows. After Sheffield’s death in 1889, the building was used for laboratory space for the school. Although the house was one of Austin’s most important works, it was demolished in 1957 by Yale to make way for Dunham Laboratory.