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In all districts, as indicated, all open off-street parking areas with 10 spaces or more, which are located on zoning lots adjacent to the boundary of a Residence District, either at natural grade or on a roof:

(a)        shall be screened from all adjoining zoning lots in Residence Districts (including such zoning lots situated across a street) by either:

(1)        a strip at least four feet wide, densely planted with shrubs or trees at least four feet high at the time of planting and which are of a type which may be expected to form a year-round dense screen at least six feet high within three years; or

(2)        a wall or barrier or uniformly painted fence of fire-resistant material at least six feet high, but not more than eight feet above finished grade (or above the roof level, if on a roof). Such wall, barrier or fence may be opaque or perforated provided that not more than 50 percent of the face is open;

(b)        shall be maintained in good condition at all times;

(c)        may be interrupted by normal entrances or exits; and

(d)        shall have no signs hung or attached thereto other than those permitted in Section 42-62 (Permitted Signs).

Paragraph (a) shall not apply at the street line of zoning lots where the planting requirements of Section 37-921 (Perimeter landscaping) apply.