Zoning regulations, although important, are not the sole restrictions on land use. Property owners and a variety of entities may agree to impose additional private restrictions on specific pieces of land. These private restrictions can create confusion regarding who, between the parties to the agreement and the municipality, has the authority to interpret and enforce their terms. The Pennsylvania Commonwealth Court recently issued a detailed, albeit nonprecedential, opinion addressing this type of scenario in Naylor v. Board of Supervisors of Charlestown Township, No. 659 C.D. 2018 (Pa. Cmwlth. Jan. 7, 2021). In Naylor, the court addressed a decades-long disagreement over the scope of a conservation easements. Among its holdings, the court concluded a township did not have standing to enforce a private conservation easement, even when it owned a separate parcel subject to the same easement. Naylor is a good reminder that municipal regulations and private agreements are distinct matters with independent enforcement mechanisms.

Easements are a common form of private land use restriction. An easement is a nonpossessory interest of a holder in real property, imposing limitations or affirmative obligations on property called the "servient" estate. Conservation easements are designed for certain "conservation" purposes, such as protecting the natural or scenic values of real property; assuring its availability for agricultural, or recreational use; protecting, or managing the use of natural resources; or maintaining land, air, or water quality.