The border of West Hempstead and Franklin Square is marked by Dogwood Avenue, but it is certainly not the limit of the growing membership at Congregation Eitz Chayim of Dogwood Park, which is undergoing an expansion campaign that will give this house-turned-shul a grand entrance with a lobby, classrooms, and a social hall. “There has been a lot of growth with more families moving into this part of town,” said Eric Bienenfeld, a member of Eitz Chayim’s expansion committee. “There is a need for the building to keep up with the growth.”