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Bent, galvanized metal flashing that is installed above a horizontal trim board of an exterior window, door, or brick run. It prevents water from getting behind the trim/brick and into the home.

The construction of a building on any of the boundary lines of a lot. Usually built on the front line, such as a store built to the sidewalk. (See also Zero Side Yard).

The building of a subdivision with each house built on a side boundary line. This gives more usable yard space on narrow lots. An easement for maintenance is given over a portion of the lot adjoining each house.

The division of a city or county by legislative regulations into areas (zones), specifying the uses allowable for the real property in these areas.

A law (generally at the city or county level) controlling the use of land and construction of improvements in a given area (zone).