sentences:  When the county seat moved to Williamsport, a log house belonging to the town's founder, William Harrison, served this purpose for several years.The first purpose-built courthouse was completed in 1835 at a cost of $2,000; in 1872, it was replaced with a new building that cost $48,000.The third courthouse was built in 1886, in a new section of town that grew around the newly constructed railroad.