Serving hopeful parents from Collin County and Dallas County. Barnett Tower, Suite 1001 3600 Gaston Avenue Dallas, TX 75246 Phone: (214) 225-2057 Fax: (214) 423-4031. Temporary hours of operation. Monday-Friday 8:00 a.m.-4:00 p.m. Closed for lunch from 12:00 p.m. - 1:00 p.m. Dallas fertility clinic directions.