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<br />18 Codifying New Urbanism <br /> <br />. <br /> <br />Variation in lot size and housing types <br />helps to maintain a healthy range <br />of household types and avoids the loolc <br />of "cookie cutter" subdivisions. <br /> <br />. <br /> <br />Accessory du.>ellings diversify housing <br />opportunities and pro'vide flexibility for <br />household needs that et>olve over time. <br />Accessory dwellings rarely need to exceed <br />the footprint of a three-car garage <br />(about 600 square feet). Entrances for <br />accessory dwellings should be <br />visible from a street or alley. <br /> <br />. <br /> <br />FIGURE 3. MIXED DENSITY AND LOT SIZE <br /> <br /> <br />Allow accessory dwellings. Allow accessory dwellings as of right in all <br />residential and mixed-use districts within residences as well as within <br />detached garages and other accessory structures. For purposes of calculat- <br />ing density, accessory units can be exempted entirely or counted as at most <br />one-half of a unit, reflecting their smaller impact on services than the pri- <br />mary dwelling. Exempting accessory units from density calculations pro- <br />vides maximum incentive for their construction (Figure 4). <br /> <br />FIGURE 4. ACCESSORY DWELLINGS <br /> <br />SIDE DRIVE ACCESS <br /> <br /> <br />ALLEY-FED ACCESS <br />