Indicates the number of available accommodation units in an [ApartmentComplex](http://schema.org/ApartmentComplex), or the number of accommodation units for a specific [FloorPlan](http://schema.org/FloorPlan) (within its specific [ApartmentComplex](http://schema.org/ApartmentComplex)). See also [numberOfAccommodationUnits](http://schema.org/numberOfAccommodationUnits).