I was slowly pulling (front end forward) into a parking space at a local retail store. Parking spots are perpendicular to building. There is a space about the width of a sidewalk that runs along the front of the building. As I was coming to a complete stop, the car suddenly accelerated on its own, crashed into the building and then stopped. The airbag did not deploy. The car is available for inspection. Both Toyota and Farmers Insurance have said they will pull data from the event logs. The unintended acceleration malfunction put me and others at severe risk. The storefront has a concrete and glass front which was damaged from the impact. If an employee or shopper had been in the area of the crash, they could have been severely injured. I suffered a contusion of the sternum and stiff neck and shoulders. The vehicle's event data has not yet been pulled and evaluated. There were no advance warning signals.