East Avenue Specialty Center Norwalk, CT. Request an Appointment. East Avenue Specialty Center Norwalk, CT. Request an Appointment. ... Patient Portal. Patients & Families. ... Administrative Offices 40 Sunshine Cottage Road Skyline Suite 1N-C26 Valhalla, NY 10595 Billing Questions: 844-664-6938 General Inquiries: 914-594-2242. Boston Children ....