The lettable space (vermietbare Fläche - "VMF") is the area of a property that can effectively be let or offered for lease. It consists of the floor area not including any structural elements or supporting pillars as well as any areas of the building dedicated to connecting areas and service ducts.

In older investment properties lacking CAD documentation, it is often not possible to calculate lettable space applying these criteria.

In such instances, calculations for the occupiable area or living space (Wohnfläche) often include internal partition walls as well as structural elements.