Museum of the City of New York On 5th Avenue at 100th Street. A lovely old Mansion, this facility holds 500 throughout the second floor galleries. The Balcony and Main floor can be used as well as the old Waiting Room that has been renovated. Lexington is easier to book. Westbury Gardens Grand old house on a lovely estate.
Grounds are spectacular but it needs a tent.
Corporate use only. Arboretum Planting Fields on the North Shore of Long Island. Can accomodate 250 Indoors and can be tented. The Picnic House, on a hilltop it overlooks a meadow. It is large enough for 200 guests to be seated.