Many sections of the greater Boston area are characterized by densely populated neighborhoods. Many of these neighborhoods were established before the adoption of zoning codes that set minimum side and rear yard setbacks. And even today, in urban settings, there are some zoning codes that allow zero-foot set back criterion in some zoning districts. The result is that there are many structures in the Commonwealth built on, or within, just a few feet of a lot line. And in urban areas, there are row houses with shared party walls and adjoining roof lines. The proximity of these structures to abutting lot lines makes it extremely difficult or sometimes simply impossible for a property owner to make a repair to their property without entering their neighbors' land.