Chapter 5 Form District Regulations Part 3 Suburban Form Districts Page 2 of 4

3. NOTE: See Section 5.1.8 for maximum setback alternatives.

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   6. Buffer and Transition Standards: - Setbacks and buffers established in Table 5.3.2 may be superseded by parkway requirements, buffer yard or form district transition zone standard pursuant to Chapter 10 Part 2, Chapter 10 Part 3 or Chapter 5 Part 7, in which case the greater standard shall apply.
   7. Pre-Existing Structures: - Non-residential structures constructed prior to the effective date of the NFD and exceeding 80,000 square feet in area on the first floor may be expanded provided that the standards listed in Section 5.5.2. The cumulative area of expansion shall not exceed 5% of the area of the structure as it existed on the effective date of the NFD regulation. The project shall be subject to the Category 3 procedures.
   8. Multiple Principal Structures Setback – Common wall construction is permissible for non-residential structures, unless restricted by Table 5.3.2. Principal structures on the same or adjacent lots constructed as detached buildings shall maintain the following minimum separations:
      1. Building wall has primary entrance or exit: 25 feet
      2. Building wall has secondary entrance or exit: 15 feet
      3. Building wall has no entrance or exit: 10 feet
   9. The buildable width of a corner lot created prior to the effective date of the NFD shall not be reduced to less than thirty two (32) feet by the application of the required side yard on the street side.
4. Alternative Housing Styles
   
   Alternative housing styles, including zero lot line, duplexes, and townhouses are encouraged in the Cornerstone 2020 Plan to provide housing choices for people of varying ages and incomes.
   1. Where permitted by the Planned Residential Development District (Section 2.7.3), the alternative housing styles shall meet the requirements set forth in Table 5.3.1, unless otherwise specified below:
      1. Detached and semi-detached units (including Zero Lot Line):
         1. Minimum Lot Area – 3000 sq ft
         2. Minimum Lot Width – 30 ft.
         3. Minimum Front Yard Setback – 15 ft.
         4. Minimum Side Yard Setback – 0 ft. between the unit and the property line; 6 feet between adjacent units on separate lots.
         5. Minimum Rear Yard Setback – 25 ft; if alley: 5 ft.
         6. Maximum contiguous units – 2.
      2. Attached Units-Townhouse (single family units with common side walls)
         1. Minimum Lot:Area: - end units: 3,000 sq ft; interior units: 2,000sq. ft.
         2. Minimum Front Yard Setback – 15 ft.
         3. Minimum Lot Width – 18 ft.
         4. Minimum Side Yard Setback – 0 ft. between attached units. Between end units, the requirements in Table 4.1 shall apply.
         5. Minimum Rear Yard Setback – 25 ft; if alley: 5 ft.
         6. Maximum contiguous units in single family zoning districts – 4
      3. Attached Unit -Patio Home (single family units with common side and rear walls)
         1. Minimum Lot Area – 3000 sq ft
         2. Minimum Lot Width –35 ft.
         3. Minimum Front Yard Setback – 15 ft.
         4. Minimum Side and Rear Setback– 0 ft. between attached units; minimum distance between adjacent structures, 10 ft.
         5. Minimum Rear Yard Setback – 25 ft; if alley: 5 ft.
         6. Maximum Contiguous Units – 4.
   2. Where permitted by the Alternative Development Incentives regulation (Chapter 4 Part 5), the alternative housing styles shall meet the requirements set forth in Table 5.3.1, unless otherwise specified below:
      1. Detached units (including Zero Lot Line):
         1. Minimum Lot Area – 4500 sq. ft. in R-4 District; 3000 sq. ft. in R-5 District, , subject to the following conditions:
            1. No more than 25% of detached units may have a lot area less than 6000 sq. ft. in R-4, or less than 4000 sq. ft. in R-5; and
            2. At least 20% of the lots in the development are 9000 sq. ft. in area or greater in R-4, and at 6000 sq. ft. in area or greater in R-5.
         2. Minimum Lot Width – 40 ft. in R-4 District; 35 feet in R-5 District
         3. Minimum Front Yard and Street Side Yard Setback –20 ft.,
            15 ft. if adjacent to alley
         4. Minimum Side Yard Setback – 0 ft. between the unit and the property line; 6 feet between adjacent units on separate lots.
         5. Minimum Rear Yard Setback – 25 ft., 5 ft. if adjacent to alley
      2. Semi-detached units (single family units with one common wall)
         1. Minimum Lot Area – 3000 sq. ft., subject to the following conditions:
            1. No more than 25% of detached units may have a lot area less than 6000 sq. ft. in R-4 or less than 4000 sq. ft. in R-5; and
            2. At least 20% of the lots in the development are 9000 sq. ft. in area or greater in R-4, and at 6000 sq. ft. in area or greater in R-5.
         2. Minimum Lot Width – 30 ft.
         3. Minimum Front Yard and Street Side Yard Setback –20 ft.
            15 ft. if adjacent to alley
         4. Minimum Side Yard Setback – 0 ft. on common wall side; 6 ft. on other side
         5. Minimum Rear Yard Setback – 25 ft.
            15 ft. if adjacent to alley
         6. Maximum contiguous units - 2
      3. Attached Units-Townhouse (single family units with common side walls)
         1. Minimum Lot:Area: - end units: 3,000 sq ft; interior units: 2,000sq. ft., subject to the following conditions:
            1. No more than 25% of detached units may have a lot area less than 6000 sq. ft. in R-4 or less than 4000 sq. ft. in R-5; and
            2. At least 20% of the lots in the development are 9000 sq. ft. in area or greater in R-4, and at 6000 sq. ft. in area or greater in R-5.
         2. Minimum Front Yard and Street Side Yard Setback – 20 ft.
            15 ft. if adjacent to alley
         3. Minimum Lot Width – 18 ft.
         4. Minimum Side Yard Setback – 0 ft. between attached units. Between end units, the requirements in Table 5.3.1 shall apply.
         5. Minimum Rear Yard Setback – 25 ft; if alley: 5 ft.
         6. Maximum contiguous units in single family zoning districts – 4
      4. Attached Unit -Patio Home (single family units with common side and rear walls)
         1. Minimum Lot Area – 3000 sq. ft., subject to the following conditions:
            1. No more than 25% of detached units may have a lot area less than 6000 sq. ft. in R-4 or less than 4000 sq. ft. in R-5; and
            2. At least 20% of the lots in the development are 9000 sq. ft. in area or greater in R-4, and at 6000 sq. ft. in area or greater in R-5.
         2. Minimum Lot Width –35 ft.
         3. Minimum Front Yard and Street Side Yard Setback – 20 ft.
            15 ft. if adjacent to alley
         4. Minimum Side and Rear Setback– 0 ft. between attached units; minimum distance between adjacent structures, 10 ft.
         5. Minimum Rear Yard Setback – 25 ft; if alley: 5 f
         6. Maximum Contiguous Units – 4.

Neighborhood Threshold Table

The following parts of chapter 5 shall apply to all developments meeting the thresholds and applicability requirements set forth in Table 5.3.3. below.