The Bucks County Commissioners have sold their old Upper Bucks Government Services Center building, on Route 309 in Quakertown. It has been vacant since 2008, when the county moved its offices to a new building on California Road in Richland Township.  At one time it housed a district court, the health and consumer protection departments, adult probation and parole and several nonprofit organizations.  A Perkasie-based tax preparation and insurance company known as White Rhino Enterprises has bought the building for $550,000.