When I worked in Downtown LA, the roof of my building held the tennis courts for the Downtown YMCA..
What people didn't know, was that there were 2 big driving cages . The YMCA didn't really control them anymore. So as a tennant of the building, I would go up there all the time and gust hit golfballs for hours. Every once in awhile one would go through the double nets and end up on Figueroa ( Doh ! )
Oh the building, if anyone works there is the world trade center (LA one - only 7 stories )..