Built for bank president B. C. Clark and his wife, Sallie, Highlands is Marlin's most notable residence and one rich in history as well as local folklore. The two-and-a-half-story wood-frame house ambles over a prominent hilltop on the outskirts of town. Classically inspired, the house is asymmetrical with a distinctive roof cresting, graceful arches and columns, and Palladian and bay windows, many of which have stained or leaded glass. Attributed to Allen, the house is similar to other residential designs by him, especially in its low-pitched hipped roof and dormers. Interiors are sumptuous with a stained glass dome in the great hall, dark mahogany woodwork in the main dining room, tufted leather wainscoting in a family dining area, and sloping cornices decorated with swags of gold leaf and plaster denticulation. Once operated as a local museum, Highlands is now privately owned.