On Tuesday, September 27 at 10:25 AM, I was driving to pickup medication for my dog. I was less than 5 miles away from my home. As I pulled up to park, I slowed down and turned into the nearest parking stall. As I set the automatic shifter to Park, the car came out of park and shifted gears into Drive; mounting the curb. I hit the brake but the car continued to move forward. When I went to pull on my Emergency brake, the car hit the side of the building. As soon as I hit the building, I was able to regain control of the car and turn the ignition off. Gratefully, no one was hurt.