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(a) Permitted Obstructions. In all Mission Bay Use Districts, the obstructions permitted over streets and alleys and usable open space by Section 136 are permitted over streets and midblock lanes (defined in Section 996(b)(4) to be the same as an alley as used in Section 136) and usable open space in Mission Bay Use Districts, except that, in MB-R districts, obstructions are not permitted over streets and obstructions over midblock lanes and park pathways (as defined in Section 996(b)(7)) are limited to one and one-half feet.
(b) Modifications and Limitations on Bay Windows. In order to allow more variety in the design of bay windows in Mission Bay Use Districts the restrictions on the dimension of bay windows contained in Section 136 are modified as follows:
(1) In addition to other bay windows permitted by Section 136, the Zoning Administrator may allow a bay window of any shape which is determined to enhance the visual appearance of the structure provided that:
(A) The total area of the horizontal projection of whatever height does not exceed 45 square feet for each increment of 25 feet of lot width;
(B) The projection into the required open area does not exceed three feet in depth and is no closer than eight feet to the centerline of any midblock lane, and
(C) There is a horizontal separation between bay windows of at least four feet.
(2) In addition to other permitted corner bay windows permitted by Section 136, the Zoning Administrator may allow a corner bay window of any shape which is determined to enhance the visual appearance of the structure provided that:
(A) The bay at each line establishing the required open area is no greater than 15 feet in width;
(B) The total area of the horizontal projection of whatever height does not exceed 90 square feet;
(C) There is a horizontal separation between the corner bay and other bays of at least four feet; and
(D) The projection into the required open area does not exceed three feet span and is no closer than eight feet to the center line of any midblock lane.
(3) Cornices at the top of bays, projecting no more than the permitted projection of the bays, which link two rows of bay windows to establish a + 25 foot building articulation are permitted.
(c) Obstructions by Minor Architectural Features. Within the area of minimum vertical clearance required by Section 136 for obstructions over usable open space, horizontal projections, not to exceed six inches, of a purely architectural or decorative character, such as sills, room and window moldings, belt courses, columns, piers and rusticated materials, are permitted.
(Added by Ord. 63-91, App. 2/27/91)