I'm not sure I would mind seeing the park developed. I think the plaza/park in front of the new library and the architecture building will fill the same role. I'd rather see the retail strip extended down the street some more. It'd be nice to have a prominent store built on the underused lawn at the corner of Brunswick, and smaller shops and eateries in another building fronting on both the street and the pedestrian path in behind, with a little bit of residential above.
I'm not 100% on the green building, but I'd definitely like to see something like the blue one built. I think the path to Pizza Corner should be preserved as a pedestrian-only street.
(of course, this all depends on the old library sticking around. Not sure if it should or not...it's an awkward space and I don't think it's anything too special architecturally.)