Elevators are integral to accessible, smooth, and efficient operations in many applications. For low-rise buildings, hydraulic elevators or gearless machine room-less (MRL) elevators are most common; this course compares the two in terms of sustainability and cost. Also presented are the history of the elevator, types of elevators suitable for installation in a range of buildings, the distinctions between proprietary and nonproprietary elevator systems, and recommendations on how to specify a nonproprietary system to maximize its long-term benefits.