 Suppose a "low density residential" zone requires that a house have a setback (the distance from the edge of the property to the edge of the building) of no less than 100 feet (30 m).If a particular property were only 100 feet (30 m) deep, it would be impossible to build a house on the property.Governmental land-use regulation that deny the property owner any economically viable use are deemed a taking of the affected property.