hybridy;
try this:
http://www.flat151.com/index.htm it's on one of the floors of the murphy telegraph building. only thing i've heard about it is that's it's nice but a little pricey.
some other more conventional ideas: there is the top floor of the gaurdian building that you can rent. it has the views and you can even run it in conjunction with a lobby party. the lobby or black box theatre at the max m. fisher/orchestra hall. lobby of the fox theatre. the masonic has a multitude of sizes, styles, and areas available - take a tour and check them all out.