At this point, Why not let the new Festival Building or whatever it is look more like the other buildings in the core with matching facade and rooflines, and include a roof garden for events and fireworks viewing. The original buildings were all glass window walls before they were covered up... Match what was there, but purpose built with elevators, escalators and stairs to access the roof garden and upper tier and extended roof over a "Festival kiosk garden" area. No reason this building should look low and squat and cheap... It should still match the rest of the buildings there...
And for God's Sake make the centerpiece a spectacular fountain worthy of the park...not a promotional display planter...boo!