The "...Lancaster County court held its first session in August 1729, at a local tavern."
Things have changed since then. (Here is more history.)
The modern Lancaster County Court of Common Pleas handles:
The Court of Common Pleas also administers specialized treatment courts for qualified criminal offenders to build recovery and wellness into the criminal justice process. In many cases, successful participation leads to reduced punishments. And offenses may be removed from criminal records.
For people who are representing themselves (without lawyers), there is self-help center in the Courthouse.
The Court of Common Pleas is housed in the Lancaster County Courthouse, along with many of the county court system offices.