PITTSBURGH, PENNSYLVANIA 3-10-2018 Lower Frick Park on Commercial Avenue. The view toward Walnut Towers and the State Route 376 bridge before the Squirrel Hill tunnel from Nine Mile Run in Frick Park, a popular hiking trail. The bridge is slated for reconstruction in the near future and the Walnut Towers apartments have been a bone of contention with local residents. The weight and placement of the parking lot has caused severe landslides onto Commercial Avenue resulting in its closure. Commercial Avenue is heavily traveled on a daily basis.