The oldest extant building on Hillhouse Avenue in New Haven is this Federal-period house with later Victorian-era modifications. The Abigail Whelpley House was built by 1826 (with some estimates as early as 1800 and moved to the site) and was a traditional, five-bay, two-story Federal style residence. It is said that the house was built by James Abraham Hillhouse (1789-1841) for his widowed family member, Ms. Whelpley, and her two sons. As of 1849, the property was owned byNoah Porter, later President of Yale, who would alter the house in the 1860s with the addition of a mansard roof and trim, all designed by architect, Henry Austin. The house, now known as Allwin Hall, is maintained by Yale University and contains offices for the program on Ethics, Politics & Economics.