Chowhound from outside Philadelphia coming into San Francisco this weekend and looking for Sunday Brunch at a place that takes reservations. We are staying at a hotel in the Union Square area but also willing to take a cab. I have checked a number of the recommended brunch spots but no reservations and long waits are mentioned. In addition we would prefer to order from a menu rather than a buffet and would like cocktails or champagne to be available. Any recommendations are appreciated.