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boundaries of the districts on the Official Zoning Map, the following rules shall apply: 1. Boundaries indicated as approximately following the center lines of streets, highways, or alleys shall be construed to follow such center lines. 2. Boundaries indicated as approximately following platted lot lines shall be construed as following such lot lines. 3. Boundaries indicated as approximately following City limits shall be construed as following such City limits. 4. Boundaries indicated as following railroad lines shall be construed to be midway between the main tracks. 5. Boundaries indicated as following shorelines shall be construed to follow such shorelines, and in the event of change in the shoreline shall be construed as moving with the actual shoreline. 6. Boundaries indicated as following the center lines of streams, rivers, canals, or other bodies of water shall be construed to follow such center lines. 7. Boundaries indicated as parallel to or extensions of features indicated in subsections 1 through 6 above shall be so construed. 8. Distances not specifically indicated on the Official Zoning Map shall be determined by the scale of the map. 9. Where physical or cultural features existing on the ground are at variance with those shown on the Official Zoning Map, or in other circumstances not covered by subsections 1 through 8, the City Planning Board shall recommend and the City Council shall interpret the district boundaries. 10. Where a district boundary line divides a lot which was in single ownership at the time of passage of this Ordinance, the City Planning Board may recommend and the City Council may permit the extension of the regulations for either portion of the lot into the remaining portion of the lot.