是虚拟语气啊,if only because the duplication of facilities should be avoided, building large new hospitals in the bistate area would constitute a wasteful use of resources.
意思是,如果仅仅因为设施重复建设是要避免的原因,在b地区建设新的大医院将是资源的浪费。
if only because the duplication of facilities should be avoided,是条件状语从句。