There can be an average of 35 - 70 sq. ft. underneath a standard Queen size mattress, depending on its height from the floor. That's roughly the size of an average bedroom closet, lying down! This bed frame reclaims storage space, relieving valuable closet space. Ideal for mattresses of any size, you simply won't believe how incredibly useful this is! This particular model boasts a roll-away filing cabinet underneath, and so much more!