The matters covered by this section shall include: a) any municipal zoning regulation, or any amendment thereof, which would change the district classification of or the regulations applying to real property lying within a distance of 500 feet from the boundary of any city, village, or town, or from the boundary of any existing or proposed county or state park or other recreation area, or from the right-of-way of any existing or proposed county or state parkway, thruway, expressway, road or highway, or from the existing or proposed right-of-way of any stream or drainage channel owned by the county or for which the county has established channel lines, or from the existing or proposed boundary of any county- or state-owned land on which a public building or institution is situated; and b) any special permit, site plan, or variance affecting such real property within such distance of 500 feet. The term "proposed" shall be deemed to include only those recreation areas, parkways, thruways, expressways, roads or highways which are shown on a county plan adopted pursuant to Subdivision 2 of § 239-d of the General Municipal Law or adopted on an official map pursuant to § 239-e of such law.[1]