An application process is required to obtain housing in either of the LLC dormitories. Hartley also houses Columbia's undergraduate housing office. A small kosher deli used to be housed on the main floor.
Overhauled during a 1980s renovation, the dorm is organized into mostly two-story suites, where up to 15 students live in single and double rooms. The suites' common space includes kitchens, bathrooms and living/dining areas. Along with neighboring Wallach Hall, it is currently part of the Living and Learning Center (LLC), home to suite-style housing that intermingles all class levels and features interactive events designed to draw them together.