While in the process of pulling into marked stall in parking lot car accelerated unexpectedly jumping over a concrete stop and crashing into the wall of a building. Car sustained eleven thousand dollars worth of damage and the wall that was hit was caved in. Cost of wall repair is unknown at this time. After the collision an attempt to dislodge the car was attempted by putting the car in reverse. The engine RPM was still racing and the car jerked backwards uncontrollably requiring the engine to be shut off to stop the car. Nobody was injured only property damage.