Walk-ups is a term commonly used to describe a type of apartment building without an elevator, where residents must walk up flights of stairs to reach their units. However, there are many synonyms that are equally applicable to describe walk-ups, including low-rise, no-lift, stair-access and walk-up buildings. These types of buildings are typically found in densely populated urban areas, where space is at a premium and multi-story buildings can accommodate more residents. While walk-ups can present physical challenges for some residents, they are often appealing due to their affordability and proximity to urban amenities. Synonyms for walk-ups may vary by region or country, but they all refer to the same concept of a multi-story building without an elevator.