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            ZERO INTEREST MORTGAGE - note and mortgage under which interest accrues but is not paid until the end of the term of the loan. 
            ZERO LOT LINE - 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. 
            ZERO SIDE YARD - building of a subdivision with each house built on a side boundary line. This gives more usable yard space on a narrow lot. An easement for maintenance is given over a portion of the lot adjoining each house. 
            ZONE - (1) area of a county or city in which the use of the land is restricted by law (zoning ordinance). (2) An area designated by a number for the delivery of mail. Zip codes incorporate the zones. 
            ZONING - division of a city or county by legislative regulations into areas (zones), specifying the uses allowable for the real property in these areas. 
            ZONING MAP - map of a community showing the zones of permitted use under zoning ordinances. 
            ZONING ORDINANCE - law (generally at the city or county level) controlling the use of land and construction of improvements in a given area (zone). 
            ZONING VARIANCE - Also See: Variance. 
            ZYGOCEPHALUM - In civil law an inaccurate measure of land. The area of land a yoke of oxen could plow in one day.