Which early zoning tool was used to manage the sheer volume of building allowed on a given piece of land by using a ratio?

Answer

Floor Area Ratio (FAR)

Floor Area Ratio (FAR), the ratio of a building's total floor area to the size of the lot, was the crucial component used by regulators to manage the sheer volume of building that could occur on a given piece of land.

Which early zoning tool was used to manage the sheer volume of building allowed on a given piece of land by using a ratio?
inventorsystemregulationurban planningzoning