Once the old Washington Mall is torn down, Costco will become the anchor tenant. When Costco takes over the property, which has been empty for more than a decade, it will be one of the biggest stores in southwest Pennsylvania,

Washington County commissioners said most of the old Washington Mall will be torn down to make way for new dining and retail. Those new locations will include a Costco store.

In a “major announcement” during their real estate expo Wednesday, the Washington County commissioners revealed that the retail warehouse club will become the anchor tenant at the Washington Mall site once that property is demolished and prepared for development.