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§ 10.56 ,, 6. Average lakeshore setback. No principal . l . or accessory structure shall be located closer to the lakeshore than the average distance from the shoreline of existing residence buildings on adjacent lots, except that this does not apply to stairways, lifts, landings, and lockboxes. Further, the average lakeshore setback shall apply only to classified lakes, and shall -not apply to tributaries. The average lakeshore setback line shall be a straight line connecting the most lakeward protrusions of the residence buildings on the immediately adjacent lakeshore lots. D. Minimum Lowest Floor Elevations. All structures located within the Shoreland Overlay District which are subject to the flood plain regulations of Section 10.55 of this ordinance shall be placed at an elevation consistent with the requirements of that section. The regulatory flood protection elevation shall be established as set forth in Section 10.55, Subd. 7 of this code. Al 1 structures constructed within the Shore land Overlay District shall have their lowest floor, including basement, placed at an elevation no lower than the regulatory flood protection elevation. Where the regulatory flood plain elevation cannot reasonably be determined, the minimum elevation at which the lowest floor, including basement, ·may be placed shall be determined as follows: 1. For lakes, by placing the lowest floor at a level at least 3 feet above the highest known water level, or 3 (. feet above the Ordinary High Water Level, whichever is higher. 1 - 2. For rivers and streams, by placing the lowest floor at least 3 feet above the flood of record. E. Water-oriented Accessory Structures. The only water-oriented accessory structure allowed to be located nearer the Ordinary High Water Level than the normal structure setback as specified in this section shall be a lock box no greater than 20 square feet in area and no higher than 48 inches in height. Such a structure requires a building permit from the City. F. Stairways, Lifts and Landings. Stairways and lifts are the preferred alternative to major topographic alterations for ~chieving access up and down bluffs and steep slopes to shore areas. Stairways, lifts and landings shall be allowed in the shore setback zone and must meet the following design requirements: 1. Stairways and lifts must not exceed 4 feet in width. 2. Landings for stairways and lifts shall not exceed 32 square feet in area. 3. Canopies or roofs are not allowed on c-·· stairways, lifts, or landings. ':.-_,· ORONO CC 376-12 (2-24-92)