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(B) Office Uses on Colby Avenue in R-3 and R-4 Zones. Offices are permitted as a stand-alone use only on corner lots in those portions of the R-3 and R- <br /> 4 zone that front on Colby Avenue, between 19th Street and 25th Street, subject to the following requirements: <br /> 1) Office uses may only be established in existing single-family dwellings or in existing nonconforming buildings. Existing buildings may not be <br /> removed and replaced with new office buildings. <br /> 2) For existing single-family dwellings that are converted to office uses, the building shall maintain the appearance of a single-family dwelling. Any <br /> additions or remodeling shall not increase the gross floor area of the existing building by more than twenty-five percent. <br /> 3) Off-street parking shall be located to the rear of the building and may take access only from the alley, except where an existing parking area takes <br /> access from the street. <br /> 4) Wall signs are limited to one per building, and a maximum area of sixteen square feet. Freestanding signs are limited to one per building, a <br /> maximum height of five feet, a maximum area of sixteen square feet, and shall be set back ten feet from the front or side lot lines. Internally illuminated <br /> signs are prohibited. <br /> (C) Except as provided by paragraphs (B) or(D) of this Special Regulation (10), office uses are permitted in the R-4 or R5 zones only in mixed-use <br /> buildings in which at least fifty percent of the gross floor area is used for two or more dwellings. Chapter 15 of this title, and the multiple-family design <br /> guidelines, shall apply to mixed-use office-residential developments with three or more dwelling units. <br /> (D) When the property is located in the"O" or"C-O" overlay zone, the provisions of Chapter 16 of this title shall apply. <br /> (11) Permitted as an accessory use for those products produced on premises, up to but no more than twenty percent of goods sold may be produced off-site and <br /> by other producers. <br /> (12) Outside runs or other outside facilities for animals are not permitted. Buildings shall be constructed so noise from this use is not audible on residentially <br /> zoned lots. <br /> (13) Bakeries in this zone may devote up to fifty percent of their gross floor area to the production of bakery products for wholesale distribution. In the R-4 and R- <br /> 5 zone, bakeries are permitted only in mixed-use buildings in which: <br /> a) Business is oriented to immediately surrounding neighborhood. <br /> b) At least sixty-five percent of the gross floor area is used for multiple-family dwellings. <br /> c) The maximum gross floor area devoted to an individual nonresidential use is four thousand square feet. <br /> d) No additional curb cuts are permitted for the nonresidential use(s). <br /> (14) Not more than fifty percent of the total floor area may be used for brewery production. <br /> (15) The following regulations apply only to espresso stands which are contained in a structure, and which can serve customers who remain in their vehicles, by <br /> means of a drive-up window. Mobile espresso vehicles are not subject to these regulations. Espresso retail uses not able to serve customers who remain in their <br /> vehicles shall be regulated as a "restaurant." <br /> a) Drive-up espresso stands shall be located so as not to remove or obstruct required off-street parking for other uses on the same lot or an adjoining lot. <br /> b) One off-street parking space shall be provided for each employee working at any given time. <br /> c) Street frontage landscaping shall be provided in accordance with the zone in which the property is located. <br /> d) Holding lanes shall provide sufficient room on-site for three vehicles for each service lane without obstructing required off-street parking areas for other <br /> uses on the lot or an adjoining lot. <br /> e) The building shall be set back a minimum of ten feet from required street frontage landscaping when a drive lane is proposed on the street side of the <br /> structure, and fifty feet from any residentially zoned property. <br /> f) Signs shall be permitted as provided for the zone in which the property is located. <br /> (16) The following regulations shall apply to restaurants: <br /> a) In the R-4 and R-5 zones, restaurants are permitted only in mixed-use buildings in which: <br /> (1) Business is oriented to immediately surrounding neighborhood. <br /> (2) At least sixty-five percent of the gross floor area is used for multiple-family dwellings. <br /> (3) The maximum gross floor area devoted to an individual nonresidential use is four thousand square feet. <br /> 22 <br />