I had an exceptional dinner for 13 at Allen's recently. It may be a little farther from Michigan Avenue than you're hoping for (217 W. Huron), but I found the slight extra distance to be worth the trip. For what it's worth, my group walked comfortably from the Hotel Intercontinental -- it took about 20 minutes.
I don't know if this is a business dinner, but if so, Allen's is a great choice. You can call in advance and plan a group menu with their private dining staff. I was able to choose all my appetizers, entrees, and desserts ahead of time and according to my budget. They also let me choose the wine -- one white and one red -- so I could keep within my budget.
Everything was lovely from start to finish: We were greeted by Chef Allen personally; the menus were custom printed to welcome my visiting group by name; and the food was exquisite and varied. The server even quietly approached me as my alcohol bill reached our agreed-upon limit, just to see whether I wanted to continue with drinks (it was almost dessert, so I cut off the tab). My colleagues are still raving about this dinner, and it was back in late April.
Best of all, they have a wonderful room that's set aside from the rest of the main dining room, but not a sequestered banquet room. If you decide to go, be sure to ask for the "Square Room." It was lively but conversation-friendly.
I've hosted a lot of these things for visiting colleagues, and nothing's even come close to the quality and service I found at Allen's. Highly recommended for a group dinner.
Good luck,
Christy