St. Luke’s University Health Network has opened a seventh medical office building in the area of Eighth and Eaton avenues in Bethlehem. St. Luke’s University Health Network has opened a seventh medical office building in the area of Eighth and Eaton avenues in Bethlehem. The newest SLUHN building in the neighborhood off Rt. 378 is located at 1530 Eighth Avenue and opened at the beginning of September.