Within the 30 days first following the filing of a land use appeal, if the appeal is from a board or agency of a municipality, the municipality and any owner or tenant of property directly involved in the action appealed from may intervene as of course by filing a notice of intervention, accompanied by proof of service of the same, upon each appellant or each appellant's counsel of record. All other intervention shall be governed by the Pennsylvania Rules of Civil Procedure.
53 P.S. § 11004-A