The Koon house is distinguished architecturally for its design elements that differentiate it from the bungalow, the most commonly found Craftsman influenced house form in Cumberland. The Koon house was built in a large scale, with horizontal massing of rectangular shapes, a hipped roof covered with round terra cotta tiles, and a single exterior wall covering (brown brick). The interior of the house conveys a feeling of open space, an important feature of this period. While these modern forms and concepts were chosen by the architects of the Koon house, they also incorporated Queen Anne details they were familiar with from the late 19th century, such as a curved stairway, decorative mantel in the office, bowed wall of the dining room, and sash windows at the rear of the house. The house today remains a private home.
The Thomas Koon House is located at 221 Baltimore Ave., just east of the Downtown Cumberland Historic District. As a private residence, the house is not open to the public.