sentences:  John H. Addams built the brick, federal-style house in two portions beginning in 1846.The smaller, northern part of the house was built in 1846, and in 1854 he added the larger southern portion of the house and its central entrance.Addams completed further alteration during the 1870s when he added a chimney and bay to the southern portion of the house, and a porch over the central front entrance.