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Exceptions to this rule:When the 1-799 range has been exhausted within a square, the Surveyor\u2019s Office assigns numbers from 1200 or may even use 8000 and aboveFor reasons unknown, 42 Squares have record lot numbers greater than 799 but less than 1200Additionally, in most case scenario\u2019s, a piece of property must be a Record Lot before a building permit will be issued for that site in the District of Columbia, and all proposed Record Lots are carefully reviewed by Zoning Administration officials for compliance with the city\u2019s Zoning Ordinances. Other agencies that review new record lots besides OS are Office of Zoning, Office of Planning, the Dept. of Public Works, Historic Preservation and DDOT.Record lots are defined only when requested by property owners, normally when they are seeking a building permit. Record lots are recorded in Plat Books and Subdivision Books in the Office of the Surveyor. These documents are bound volumes of historical representations of the locations of property lines, and they include record dimensions, though typically no bearings of lines. These lots are located within squares, which usually correspond to one or two city blocks. Certain record lots can also be classified as \u201cof-lots\u201d. An \"Of-Lot\" is the D.C. Surveyor\u2019s Office term for describing \u201cRemaining/Part of Original Lot X\u201dIn the record lot feature class, if a domain value of 1 resides in the \u201cOF_LOT\u201d field, you can assume that at one time the original lot was modified. 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