The balcony on the second floor mimics the one on the ground floor. The only differences are that there are three chair-and-lectern combos and there is no awning. However, like the patio below, the area is charmed similarly to prevent the elements from getting in and ruining the reading experience for customers perched there.
No warning alarm will go off up here. Yet, again like the ground floor, a similar spell to prevent an unpaid book from leaving the premises is still in place up here.