Indicates the total (available plus unavailable) number of accommodation units in an <a class="localLink" href="/ApartmentComplex">ApartmentComplex</a>, or the number of accommodation units for a specific <a class="localLink" href="/FloorPlan">FloorPlan</a> (within its specific <a class="localLink" href="/ApartmentComplex">ApartmentComplex</a>). See also <a class="localLink" href="/numberOfAvailableAccommodationUnits">numberOfAvailableAccommodationUnits</a>.