All agreements in writing relating to real property situate in this Commonwealth by the terms whereof the parties executing the same do grant, bargain, sell, or convey any rights or privileges of a permanent nature pertaining to such real property, or do release the grantee or vendee thereunder against damages which may be inflicted upon such real property at some future time, shall be acknowledged according to law by the parties thereto or proved in the manner provided by law, and shall be recorded in the office for the recording of deeds in the county or counties wherein such real property is situate.