This research page shows some more interesting examples of rooftop facilities. The page show recent youth training facilities developed in America by Manchester City F.C. More interesting is the Montalban Theater in California. With the help of Nike they were able to expand and build a rooftop court. One thing I love is that the rooftop court is not just used for sports but is also used for event giving the space a multi-functional purpose.
http://www.themontalban.com/
