ON 10/22/2015, I PARKED MY JEEP GRAND CHEROKEE WITH ENGINE RUNNING AND EXITED THE VEHICLE.THE SHIFTER WAS PLACED IN PARK PRIOR TO MY EXIT. ABOUT 30 SECONDS LATER, I DISCOVERED MY JEEP CRASHED INTO AN OCCUPIED APARTMENT. THE JEEP HAD ROLLED BACKWARDS, UNATTENDED, ACROSS A PARKING LOT UNTIL IT STRUCK THE BUILDING CAUSING DAMAGE TO THE STRUCTURE. NO INJURIES. SEVIERILLE POLICE REPORT FILED 2015030090.