A setback, in the specific sense of a step-back, is a step-like form of a wall or other building frontage, also termed a recession or recessed storey. Importantly, one or more step-backs lowers the building's center of mass, making it more stable. A setback as a minimum one-bay indent across all storeys is called a recessed bay or recess and is the more common exterior form of an alcove (architecture). Notable upper storeys forming a step-back may form a belvedere – and in residential use are considered the penthouse. If part of the roof, then they are a loft or attic/garret. History Setbacks were used by people to increase the height of masonry structures by distributing gravity loads produced by building materials such as clay, stone, or brick. This was achieved by regularly reducing the footprint of each level located successively farther from the ground. Setbacks also allowed the natural erosion to occur without compromising the structural integrity of the building. The most prominent example of a setback technique is the step pyramids of Mesopotamia and Ancient Egypt, such as the Teppe Sialk ziggurat or the Pyramid of Djoser. For centuries, setbacks were a structural necessity for virtually all multi-level load-bearing masonry buildings and structures. As architects learned how to turn setbacks into an architectural feature, most setbacks were however less pronounced than in step pyramids and often skillfully masked by rich ornamentation. The introduction of a steel frame structural system in the late 19th century eliminated the need for structural setbacks. The use of a frame building technology combined with conveniences such as elevators and motorized water pumps influenced the physical growth and density of buildings in large cities. Driven by the desire to maximize the usable floor area, some developers avoided the use of setbacks, creating in many instances a range of fire safety and health hazards. Thus, the 38-story Equitable Building, constructed in New York in 1915, produced a huge shadow, said to "cast a noonday shadow four blocks long", which effectively deprived neighboring properties of sunlight. It resulted in the 1916 Zoning Resolution, which gave New York City's skyscrapers their typical setbacks and soaring designs. Setbacks and urban planning Today many jurisdictions rely on urban planning regulations, such as zoning ordinances, which use setbacks to make sure that streets and yards are provided more open space and adequate light and air. For example, in high density