Office Party Near Murray Hill
With a group that size you'd probably want to call whatever bar/resto in advance. While you may not necessarily want a private room, the place may be willing to give you your own space.
That said, there are a ton of bars along 3rd avenue that are pretty big and would probably be willing to accomodate. They're not fancy, but they'll do.
Choice Kitchen & Cocktails is one that comes to mind, but there are many that would probably work.