Walk ups are buildings that are accessed by stairs rather than elevators. There are several synonyms for walk ups, including walk-up apartments, walk-up buildings, and stair-access buildings. Other terms that are commonly used to describe walk ups include boutique buildings, brownstones, and tenements. These types of buildings are often found in urban areas and are popular among people who prefer a more old-school feel to their living arrangements. They also tend to be more affordable than buildings with elevators, making them an attractive option for young professionals and students. Whether you call them walk ups, walk-up apartments, or stair-access buildings, these structures remain a timeless part of city living.