There's an RFP out to redesign the expansive dead zone in downtown Saint Louis known as the Gateway Mall. You can view the RFP
here (warning: it's a huge file).
The RFP is illustrated with various plans for the mall dating back to 1907. Some are interesting, most are not. There's a plan from the 80s that called for constructing buildings in the mall, eliminating the green space. That's where I'd go with a plan for the Gateway Mall. Downtown doesn't a mile of green space, it needs activity and moving bodies. One interesting suggestion in the RFP was to take the dead wall space of the parking garages across from Kiener Plaza and transforming them into multi-media attractions. I thought that was a clever idea and it could add some life to the place.
I'm looking forward to viewing the submissions...I'm just hoping someone has the guts to build the space out.