Ballston Medical Center Parking If there is an attendant on duty, please show your iParkSimple Parking reservation number or Pass, either printed or on your mobile device. If there is no attendant on duty, your reservation will be monitored by your license plate entered on iParkSimple. Make sure your license plate matches the plate on your Parking Pass. Failure to do so will result in a ticket or tow. You may park anywhere that doesn't say "Reserved". NO in/out privileges. You CANNOT enter & exit more than once with one payment.