(a)   Purpose. This district is established to preserve and protect the residential neighborhoods in the City's historic district. These neighborhoods, while containing some multi-family and single-family attached units, are dominated by a significant number of historic detached homes with relatively shallow setbacks and yard depths. Densities are relatively high, with lot sizes generally less than 30,000 square feet. There are strong connections and easy accessibility to the Village Core; however, increasing traffic congestion is a growing detriment to the quality of life in this district's residential neighborhoods. There are few environmental constraints on new development, but there also are few potential development areas. The regulations contained in this district are intended to permit compact residential densities, including multi-family residential uses, while assuring compatibility with existing residential neighborhoods and their historic character and strengthening this district's linkages with the Village Core. Potential traffic impacts from new developments will be scrutinized as part of the development approval process.
   (b)   Uses By-Right.
      (1)   Residential.
         A.   Family day care homes, small (one to six children).
         B.   Residential group homes for up to five handicapped or elderly people.
         C.   Single-family, detached subject to the restrictions in division (d)(4) of this section.
      (2)   Institutional/civic/public.
         A.   Public park or recreation areas, including multipurpose trails.
         B.   Public recreational facilities, indoor or outdoor.
         C.   Public safety and emergency services.
         D.   Essential public utility and public services installations, including bus shelters and bus stops, but not including water towers, power generating stations, transfer stations, or outdoor storage.
      (3)   Accessory uses. See Section 1206.03 .
   (c)   Conditional Uses. The following uses shall be conditionally permitted in District 4 subject to meeting all applicable requirements set forth in this section and Section 1206.02 , Conditional Uses.
      (1)   Residential.
         A.   Assisted living.
         B.   Duplexes.
         C.   Model homes.
         D.   Multi-family.
         E.   Residential group homes for the handicapped or elderly (from six to eight people).
         F.   Single-family, attached.
         G.   Townhomes.
      (2)   Commercial/retail.
         A.   Bed and breakfast inns.
         B.   Private-membership recreational facilities or clubs.
      (3)   Institutional/civic/public.
         A.   Cemeteries.
         B.   Places of religious worship, including churches and synagogues. Religious schools and day care centers may be permitted as accessory uses within the same structure as the principal conditional use.
         C.   Public, non-profit, or private cultural facilities, including but not limited to libraries and museums.
         D.   Public safety and emergency services, including police or fire stations and emergency medical services.
         E.   Schools, public or private–preschool, elementary, secondary, or post-secondary–including dormitories.
      (4)   Accessory uses.
         A.   Shared driveways for dwellings.
         B.   See Section 1206.03.
   (d)   Property Development/Design Standards. In addition to compliance with all applicable standards set forth in Chapter 1207 , Zoning Development and Site Plan Standards, development in District 4 shall comply with all of the following development/design standards (all standards are minimums unless otherwise noted):
      (1)   Maximum net density.
         A.   Single-family detached: four dwelling units per acre unless the net density of a proposed development exceeds 150 percent of the net density of the residential development within 600 feet of a proposed development, excluding vacant parcels. In such case, while the maximum net density is four dwelling units per acre, the proposed development shall be a conditional use subject to procedures of this Code.
         B.   Duplexes: four dwelling units per acre.
         C.   Single-family attached: five dwelling units per acre.
         D.   Townhomes: six dwelling units per acre.
         E.   Multi-family: ten dwelling units per acre.
      (2)   Permitted mix of residential uses per development. Within any one residential development project in District 4, no more than twenty-five percent of the total number of housing units in the development shall be single-family attached and/or multi-family units.
      (3)   Open space. In addition to compliance with the standards and requirements governing open space set forth in Section 1207.05 , development in District 4 shall set aside a minimum of twenty-five percent of the gross land area for private open space.
      (4)   Minimum lot size.
         A.   Single-family detached and duplex: 6,000 square feet.
         B.   Single-family attached: 6,000 square feet.
         C.   Townhomes: 2,500 square feet.
         D.   Multi-family: 10,000 square feet.
      (5)   Minimum lot width.
         A.   Single-family detached: sixty feet.
         B.   Duplexes: sixty feet.
         C.   Single-family attached: twenty feet.
         D.   Townhomes: twenty-four feet.
         E.   Multi-family uses: 150 feet.
         F.   Non-residential uses: 150 feet.
         G.   Lots abutting railroad right-of-way: In order to enable an increase in the rear yard setback and allow room for a landscaped buffer between the dwelling and the railroad right-of-way when a lot abuts and backs onto a railroad right-of-way, the minimum lot width may be reduced by not more than ten percent provided the lot depth is at least 250 feet.
      (6)   Setbacks. Unless modified pursuant to Section 1203.08 , Minor Modifications, the minimum yard setbacks in District 4 shall be:
         A.   Minimum front yard setback:
            1.   Residential uses except multi-family: thirty-five feet.
            2.   Multi-family uses: fifteen feet.
            3.   Non-residential uses: minimum of one and one-half times the maximum height of the principal building.
            4.   Averaging shall be required for setbacks: Except for new residential development on lots fronting arterial roads, the front setback shall not differ by more than ten percent from the average of the front yard setbacks existing on the two properties immediately adjoining the subject property, unless approved by the Architectural and Historic Board of Review. If one or more of the adjoining properties is vacant, the front yard setback shall be fifty feet.
         B.   Minimum side yard setback:
            1.   Single-family uses: eight feet.
            2.   Duplexes: ten feet.
            3.   Multi-family uses: ten feet.
            4.   Side-facing attached garage: twenty-five feet.
            5.   Other accessory structures: four feet.
            6.   Corner lots: thirty-five feet for street side not designated as "front."
         C.   Rear yard depth:
            1.   Principal structure: forty feet.
            2.   Accessory structure: four feet.
         D.   Arterial setbacks: See arterial setback and landscaping requirements in Section 1207.04(k), Landscaping/Buffering.
      (7)   Maximum number of units per structure.
         A.   Single-family attached: eight attached units per structure.
         B.   Townhomes: six units per structure.
         C.   Multi-family: twelve units per structure.
      (8)   Maximum structure height.
         A.   Single-family detached and duplexes: thirty-five feet.
         B.   Single-family attached and townhomes: thirty-five feet.
         C.   Multi-family: forty feet.
         D.   Non-residential: forty feet.
      (9)   Building siting and orientation. The following building siting and orientation requirements shall apply to new development in District 4, except for new development with a front yard depth of 130 feet or more:
         A.   Principal residential structures–single-family detached and duplexes.
            1.   The main entrance(s) to the residence shall face the street.
            2.   The front wall of the principal structure shall be parallel to the street or perpendicular to a radius of the curve of the street extended through the approximate center of the main mass, if the street is curved.
         B.   Principal residential structures–single-family attached, townhomes, and multi-family.
            1.   The entrance to at least one dwelling unit within each building shall face the street. (See Figure 6.)
            2.   Each unit within a structure shall have its own front entryway to the outside.
            3.   The front wall of the principal structure, or the front wall of at least one principal structure in a multi-building development, shall be parallel to the street or perpendicular to a radius of the curve of the street extended through the approximate center of the main mass, if the street is curved.
         C.   Principal residential structures on corner lots.
            1.   In general, the structure shall face one of the streets and not the corner.
            2.   One side of the structure shall be designated the "front" and shall be subject to the requirements set forth in division (d)(9)A. or B. of this section, and requirements regarding private walks and entryways set forth below in division (d)(12) of this section.
         D.   Private garages.
            1.   Doors of attached garages shall not face the street.
            2.   Detached garages shall be located only in the rear yard.
            3.   New development of a residential dwelling shall provide space for the storage of at least one car within an enclosed garage.
         E.   Non-residential development.
            1.   The main entrance to the principal structure shall face the street.
            2.   The front wall of the principal structure shall be parallel to the street or perpendicular to a radius of the curve of the street extended through the approximate center of the main mass, if the street is curved.
            3.   The main body of the principal structure shall be closest to the street.
      (10)   Architecture and design standards. See Architectural Design Guidelines located in Appendix D .
      (11)   Bufferyard requirements for lots abutting a historic landmark. New development on lots that abut a historic landmark shall establish a bufferyard equivalent to or greater than "Bufferyard C" as set forth in Section 1207.04 (g). The bufferyard shall be established on the boundary that abuts the historic landmark.
      (12)   Private walkway entrances. All new development shall connect the front entrance of the principal structure to the sidewalk with a private connecting walkway surfaced with either concrete, brick, or stone, except where the front yard is greater than sixty feet.
      (13)   Driveway curb cuts.
         A.   Single-family detached and duplexes: No more than one driveway curb cut per lot.
         B.   Single-family attached and multi-family: No more than two driveway curb cuts per development site.
         C.   Non-residential uses: No more than one driveway curb cut per lot, except that when the lot is wider than 150 feet then no more than two driveway curb cuts per lot.
      (14)   Location of parking. In addition to the off-street parking requirements set forth in Section 1207.12 , off-street parking shall be located only to the side and rear of the principal building. Off-street parking shall not be allowed within the front setback area.
      (15)   Distance between residential buildings. Structures containing either single-family-attached, townhomes, or multi-family dwelling units shall be separated from each other by a minimum of twenty feet at their closest points.
      (16)   Pedestrian/bicycle pathways and linkages.
         A.   Provision shall be made in the design of all developments for non-vehicular circulation systems, including but not limited to sidewalks, pathways, and bikeways.
         B.   Any amount of land set aside for trails in a development shall be credited toward either the public or private open space requirements set forth in this section and in Section 1207.05.
         C.   Sidewalks at least five feet wide shall be provided on both sides of all streets in District 4, shall run parallel to the street within the right-of-way, and shall be separated from the curb by a planting strip at least five feet in width.
         D.   To the maximum extent feasible, provision shall be made in the design of developments for interconnections with existing or planned streets and pedestrian or bikeway systems on adjoining properties, unless the City determines that such interconnections would have adverse impacts on open spaces, wetlands, sensitive environmental areas, or other significant natural areas.
      (17)   Environmental standards. See Section 1205.13 , Floodplain/Floodway Overlay.
(Ord. 16-148, § 9. Passed 2-21-17; Ord. 18-93. Passed 10-15-19; Ord. 23-84. Passed 12-12-23.)