The rate of vacancy is the part of vacant dwelling among the letting housing proposed to let in the whole of housing leted or proposed to let.
The percentage of unoccupied rental space or units, e.g hotel rooms, compared to total available rental area at a given time
[n] - the percentage of all rental units (as in hotels) that are unoccupied or not rented at a given time
noun the percentage of all rental units (as in hotels) that are unoccupied or not rented at a given time