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3 . Not more than one ( 1 ) accessory dwelling unit shall be <br /> established in conjunction with a principal dwelling unit . <br /> 4 . No accessory dwelling unit shall be established in conjunction <br /> with a multi - family dwelling unit . <br /> 5 . The heated / cooled gross floor area of the accessory dwelling <br /> unit shall not exceed thirty- three ( 33 ) percent of the <br /> principal structure or seven hundred fifty ( 750 ) gross square <br /> feet , whichever is less . The accessory dwelling unit shall be <br /> no smaller than three hundred ( 300 ) gross square feet of <br /> heated / cooled area . <br /> 6 . No accessory dwelling unit shall have a doorway entrance <br /> visible from the same street as the principal dwelling unit . <br /> 7 . Detached accessory dwelling units shall be located no farther <br /> than seventy- five ( 75 ) feet in distance from the principal <br /> dwelling unit from the closest point of the principal dwelling <br /> unit to the closest point of the accessory dwelling unit . <br /> 8 . Excluding converted garage accessory dwelling units , the <br /> accessory dwelling unit shall be designed so that the exterior <br /> facade material is similar in appearance to the facade of the <br /> existing principal structure . <br /> 9 . One ( 1 ) off - street parking space shall be provided for the <br /> accessory dwelling unit in addition to spaces required for the <br /> principal dwelling unit . <br /> 10 . The accessory dwelling unit shall be serviced by centralized <br /> water and wastewater , or meet the environmental health <br /> department ' s well and septic tank and drain field <br /> requirements . Modification , expansion or installation of well <br /> and / or septic tank facilities to serve the accessory dwelling <br /> unit shall be designed in a manner that does not render any <br /> adjacent vacant properties " unbuildable " for development when <br /> well and / or septic tank facilities would be required to <br /> service development on those adjacent properties . <br /> 11 . No accessory dwelling unit shall be sold separately from the <br /> principal dwelling unit . The accessory dwelling unit and the <br /> principal dwelling unit shall be located on a single lot or <br /> parcel or on a combination of lots or parcels unified under a <br /> recorded unity of title document . <br /> 12 . An accessory dwelling unit shall be treated as a multi - family <br /> unit for traffic impact fee and traffic concurrency purposes , <br /> and the concurrency requirements of Chapter 910 for a multi - <br /> family unit shall be satisfied . <br /> E . Multi -Family Dwelling Units in Conjunction with Commercial Development <br /> - Section 911 . 10 of the LDRs <br /> COMMERCIAL DISTRICTS <br /> USE PRO OCR MED CN CL CG <br /> Multi - Family P P A A A A <br /> Residential <br /> P = Permitted use <br /> A = Administrative permit use <br /> PRO = Professional Office District <br /> OCR = Office , Commercial , Residential District <br /> MED = Medical District <br /> 45 <br />