I was stopped before turning left into a parking space. I was driving slowly. The car stopped but I did not engage the brake as a Tesla will stop once the foot is removed from the accelerator. At that point the car leaped forward at full speed hitting parts of a building and a fence. I did NOT step on the accelerator. No one was injured. The airbags did not deploy even though there was $17,000 damage to the front of the car. There were no warning signals. The person inside the building was waiting for me and saw the car come to a stop.