If you stay at the Sheraton University City in Philly, you can check out the morning of the exam and leave you stuff with the front desk or in your car. The car is parked in a garage which opens into the Sheraton University City Hotel. If you park there, you can leave the car in the hotel's garage until6pm on the day that you check out. So if you check in one day and check out the next morning, the parking cost is $15. If you check out and leave your car there, as long as you leave by 6pm (which you will if you are taking the 8am start time CSA), then it costs the same $15. It is only a 3-4minute 2 block walk from that hotel to the testing center.