Need Restaurant Suggestions: Small Baby Shower

I am throwing a baby shower for about 15-20 guests. I would love to do brunch or lunch in Park Slope--no more than 40 bucks a person. Restaurant must be wheelchair accessible. Is this a possibility? Any suggestions? Thanks in advance!

I had brunch at Maria's Mexican Bistro yesterday and at 12:30pm it was empty. Food was good - prefix (9.95pp) and certainly a large enough space, that is if you want to go mexican. While there are some small steps, I do believe their is another entrance that can be reached to get to the dining area.