7 Pa. Code § 137b.73b
The owner of enrolled land may temporarily lease a portion of the land for pipe storage yards provided that roll-back taxes shall be imposed upon those portions of land subject to preferential assessment that are temporarily leased or otherwise devoted for pipe storage yards and the fair market value of those portions of land shall be adjusted accordingly. The imposition of roll-back taxes on portions of land temporarily leased or devoted for pipe storage yards does not invalidate the preferential assessment of land which is not so leased or devoted and that land shall continue to be eligible for preferential assessment if it continues to meet the requirements of section 3 of the act (72 P. S. § 5490.3). Only one lease under this section is permitted to a landowner and a copy of the lease shall be provided to the county assessor within 10 days of its signing by the landowner. The lease may not exceed 2 years and may not be extended or renewed. Following the expiration of the lease, the land shall be restored to the original use which qualified it for preferential assessment, and preferential assessment shall resume unless the county assessor determines upon inspection that this restoration requirement has not been met.
7 Pa. Code § 137b.73b