Philadelphia architects Cope & Stewardson designed Graystone and its matching carriage house, employing the Collegiate Gothic Style of architecture for which the firm is famous. The mansion’s stately exterior of stone and slate is complemented by an equally handsome interior that includes fine wood beams, carved panels and decorative mantels. Abram Huston died in 1930 and his widow sold the property to the City of Coatesville in 1938. From 1939 until 1992, Graystone functioned as the City Hall office building. To hold public records, a two-story vault was installed. The photos below highlight the demolition of the vault and renovations to the adjoining rooms.