Thanks for the suggestions. We have decided to go with Regis. I checked back and it turns out the patio will fit our group!
For future reference for anyone searching brunch options, Clementine does not take reservations/groups on Sundays neither does Hull Street Blues.
We are looking for a restaurant in Baltimore to host a party of 18 for a Sunday brunch in late April. This event is celebrating our daughter's christening. Our budget is $25/head. We will have 4 kids (not including baby) and one gluten-free person.
So far we have ruled out Gertrude's (too confusing to get to and not kid friendly), Ten Ten (didn't call us back), and Regis.(too small).
Thanks in advance for recommendations, and I'll be sure to follow up!