There's not much to see here but the back gate of the outside wall protecting the property. But it makes a nice place to have your photo taken.
Anti graffiti coats the walls and many people have written on the plastic sheets fitted to part of the wall.
Personally I didn't want to write on the wall but quietly play my guitar and overdub full guitar sound when I got back home. A salute to the greatest rock singer of all time and the music that is a soundtrack to so many of our lives.