24-33

Permitted Obstructions in Required Yards or Rear Yard Equivalents

In all Residence Districts, the following obstructions shall be permitted when located within a required yard or rear yard equivalent:

(a)        In any yard or rear yard equivalent:

(1)        Arbors or trellises;

(2)        Awnings and other sun control devices, provided that when located at a level higher than the first story, excluding a basement, all such awnings and other sun control devices:

(i)        shall be limited to a maximum projection of 2 feet, 6 inches into such required yard; and

(ii)        shall have solid surfaces that, in aggregate, cover an area no more than 30 percent of the area of the building wall (as viewed in elevation) from which they project;

(3)        Canopies;

(4)        Chimneys, projecting not more than three feet into, and not exceeding two percent of the area of, the required yard or rear yard equivalent;

(5)        Eaves, gutters or downspouts, projecting into such yard or rear yard equivalent not more than 16 inches or 20 percent of the width of such yard or rear yard equivalent, whichever is the lesser distance;

(6)        Exterior wall thickness, where such wall thickness is added to the exterior face of a building wall existing on April 30, 2012, provided the added wall thickness has a thermal resistance (R-value) of at least 1.5 per inch, and is limited to one inch of thickness for every foot of existing yard width, up to a maximum thickness of eight inches. When an open area is provided along a common lot line, then such exterior wall thickness is limited to one inch for every foot of existing open area on the zoning lot;

Where buildings that have added exterior wall thickness pursuant to this Section are enlarged, such enlarged portion may similarly encroach upon required yards in order to align with the exterior walls of the existing building, provided such enlargement contains less floor area than the existing building, and there is no encroachment of floor area into a required yard;

(7)        Fences;

(8)        Flagpoles;

(9)        Parking spaces for automobiles or bicycles, off-street, open, accessory;

(10)        Solar energy systems, on walls existing on April 30, 2012, projecting no more than 10 inches and occupying no more than 20 percent of the surface area of the building wall (as viewed in elevation) from which it projects;

(11)        Steps, and ramps for people with disabilities;

(12)        Terraces or porches, open;

(13)        Walls, not exceeding eight feet in height and not roofed or part of a building.

(b)        In any rear yard or rear yard equivalent:

(1)        Balconies, unenclosed, subject to the provisions of Section 24-165;

(2)        Breezeways;

(3)        Any building or portion of a building used for community facility uses, including accessory parking spaces for bicycles within such building, provided that the height of such building shall not exceed one story, nor in any event 23 feet above curb level, and further provided that the area within such building dedicated to accessory parking spaces for bicycles shall not exceed the area permitted to be excluded from floor area, pursuant to Section 25-85 (Floor Area Exemption). In addition, decks, parapet walls, roof thickness, skylights, vegetated roofs and weirs, pursuant to Section 24-51 (Permitted Obstructions), shall be permitted above such an accessory building, or portion thereof. However, the following shall not be permitted obstructions:

(i)        in all Residence Districts, any portion of a building containing rooms used for living or sleeping purposes, other than a room in a hospital used for the care or treatment of patients;

(ii)        in R1, R2, R3-1, R3A, R3X, R4-1 R4A or R4B Districts, any portion of a building used for any community facility use;

(iii)        in all Residence Districts not listed in paragraph (b)(3)(ii) of this Section, beyond 100 feet of a wide street, any portion of a building used for a community facility use other than a school, house of worship, college or university, or hospital and related facilities;

(4)        Fire escapes;

(5)        Greenhouses, accessory, non-commercial, limited to one story or 15 feet in height above natural grade level, whichever is less, and limited to an area not exceeding 25 percent of a required rear yard or rear yard equivalent on a zoning lot;

(6)        Parking spaces, off-street, accessory to a community facility use, provided that the height of an accessory building, or portion of a building used for such purposes, shall not exceed 15 feet above curb level. However, such accessory building or portion of a building shall not be a permitted obstruction in R1, R2, R3-1, R3A, R3X, R4-1, R4A or R4B Districts;

(7)        Recreation or drying yard equipment;

(8)        Sheds, tool rooms or other similar accessory buildings or other structures for domestic or agricultural storage, with a height not exceeding 10 feet above the level of the rear yard or rear yard equivalent;

(9)        Solar energy systems on the roof of a building permitted as an obstruction to such yard, up to four feet in height as measured perpendicular to the roof surface when located above a permitted community facility use or attached parking structure; however, limited to 18 inches in height as measured perpendicular to the roof surface when located above a shed or detached parking structure, or on any roof with a slope greater than 20 degrees;

(10)        Water-conserving devices required in connection with air conditioning or refrigeration systems in buildings existing prior to May 20, 1966, if located not less than eight feet from any lot line.

However, no portion of a rear yard equivalent which is also a required front yard or required side yard may contain any obstructions not permitted in such front yard or side yard.

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