The area near the Q and the Jake seem like they'd be decent for a small jam. There're a number of parking garages and lots there as well.
Moving toward CSU might prove fruitful, but I've not walked around there since starting to look at things through a parkour lens (I'm new to the discipline).
Other than the M-F 9-5 (really it's more like 7:30-6:30) daily grind, I'm game for a jam.