We Moved! Our main office has been relocated. Due to continued growth and in order to better serve our customers we have relocated our Herndon office to the Sunbury Plaza on North 4th Street in Sunbury. As of April 2017 the business name for our new office and Sunbury location will be Susquehanna Outdoors instead of Hillside Structures, however it is still under the same ownership. Our mailing address will remain as Hillside Structures, 612 Amish School Road, Herndon PA 17830 but our Herndon office will now be open by appointment only. Call or stop by today!