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In all districts, as indicated, the location of primary business entrances, show windows or signs shall be subject to the provisions of this Section.

For the purposes of this Section, a lot of record or a group of contiguous lots of record held in single ownership or control at December 15, 1961, or any applicable amendment thereto shall be considered a single zoning lot, regardless of any subsequent subdivision.

For the purposes of this Section, a corner lot shall include the entire zoning lot notwithstanding the 100-foot limitation in the definition of corner lots in Section 12-10 (DEFINITIONS). All other zoning lots shall be considered zoning lots with single frontage.

The provisions of this Section shall not apply to:

1. vehicular entrances or exits for permitted drive-in uses or automotive service establishments or for permitted or required accessory off-street parking spaces or loading berths;
2. service entrances, or other entrances less than 3 feet, 6 inches in width;
3. windows other than show windows; or
4. ventilators, fire escapes or other appurtenances required by law.