1. Purpose. The commercial districts are established to accomplish the general purpose of this title and the Comprehensive Plan and for the following specific purposes:
   1. To group compatible business uses which will tend to draw trade that is naturally interchangeable and so promotes the business prosperity and public convenience;
   2. To provide an adequate supply of business and professional services to meet the needs of the residents; and
   3. To promote a high quality of total commercial development and design that produces a positive visual image.
2. Intent. The specific intent of each commercial district is as follows.
   1. C-1, shopping center commercial district. This district is intended to provide a district which may be applied to land in single ownership or unified control for the purpose of developing a planned business center with a unified and organized arrangement of buildings and service facilities at key locations which are suitable for the use and which are centrally located within the residential area they are intended to serve.
   2. C-2, neighborhood and service center commercial district. This district is intended for the convenience of persons residing in nearby residential areas and is limited in its function to accommodating the basic day-to-day shopping needs of the typical family. It is also intended as a business district which may be located in separate areas adjacent to shopping centers and thus help to keep the basic retail areas compact and convenient, and in other separate areas to provide a district which may be located in close proximity to a major thoroughfare or highway in order that highway service types of land use can be provided.
   3. C-3, office commercial district. This district is intended to provide a district which is related to and may reasonably adjoin high density or other residential districts for the location and development of administrative office buildings, medical uses, and related office uses which are subject to more restrictive controls.

1. Purpose. The light industrial district is established to accomplish the general purposes of this title and the Comprehensive Plan and the following specific purposes:
   1. To provide employment opportunities; and
   2. To group industrial and certain uses in locations accessible to highways so that the movement of raw materials, finished products, and employees can be carried on in performance standards in SLPC 16.28.010.
2. Intent. It is recognized that, while the city is predominantly residential in character, industrial uses are an important part of the city land use pattern. The regulations for this district are intended to encourage industrial development that is compatible with the surrounding or abutting land uses. To accomplish this compatibility, development in the light industrial district:
   1. Is limited to administrative, wholesaling, manufacturing, and related commercial uses that can be carried on in accordance with the performance standards set forth in SLPC 16.28.010;
   2. Must provide suitable open spaces, landscaping, and parking areas; and
   3. Must establish a high standard of appearance and controls for external effects (such as noise, smoke, and the like).

1. Commercial districts. Uses in commercial districts shall be allowed as set forth in SLPC 16.04.040 App. D.
2. Light industrial district. Within a light industrial district, no building or land shall be used except for one or more of the uses as set forth in SLPC 16.64.040 App. D, providing they comply with the performance standards set forth in SLPC 16.28.010.

All required yards shall either be open landscaped and green areas or be left in a natural state, except where off-street parking is required as specified in SLPC 16.40.010. If any yards are to be landscaped, they shall be landscaped attractively with lawns, trees, shrubs, and the like. Any areas left in a natural state shall be properly maintained in a sightly and well-kept condition.

1. If new public streets are proposed or if the development will require more than one lot or tract, the layout of any proposed streets shall show the right-of-way widths and the proposed names of all streets. Proposed street names shall not duplicate the name of any street already in existence in the city or its environs unless the proposed street is an extension of an already existing street. The street layout shall cover the whole ownership tract.
2. All public rights-of-way with non-residence districts shall be considered collector streets or arterials as defined in the city thoroughfare plan.
3. Upon finding by the Planning Commission and City Council that the proposed zoning district and preliminary plat will constitute a district of sustained desirability, will be consistent with long range comprehensive plans for the city, and will meet the requirements of the district, the City Council may establish that district on the property included in the preliminary plat. The preliminary plat as approved, together with such covenants, deed restrictions, controls, or conditional use permits as may be attached to it, shall be filed and recorded by the owner or developer in the office of the County Register of Deeds and shall become a part of the ordinance establishing the zoning change. Any substantial change to the plan will require resubmission for approval by the Planning Commission and City Council.
4. The final platting of the land shall be subject to requirements for approval, recording, and the installation of improvements as required by other city ordinances.
5. The owner or developer must agree to comply with all the requirements of the city regarding lighting, noise abatement, traffic control and regulation, maintaining order, and keeping the premises free from debris.

1. Purpose. It is the policy of the city to encourage excellence in site and building design of commercial and industrial development in zoning districts C-1, C-2, C-3, and I-1. The site plan review enables the City Council to insure that the applicant has made adequate provisions for utilities (sewer, water, and storm sewer), traffic (off-street parking, circulation access), safety precautions (lighting, pedestrian walks, traffic-control signs), and amenities (exterior design, landscaping, and screening).
2. Required information for site plans. A building permit application in the above listed zoning districts shall include 11 paper copies and one digital copy of site plans presenting the following information:
   1. Complete architectural plans showing the floor plans and elevation of the proposed buildings, and identification of the use of each structure;
   2. Complete plans and specifications for exterior wall finishes proposed for all principal and accessory buildings;
   3. Provision for off-street parking, vehicle storage, internal and external circulation, and supplementary traffic data in sufficient detail to calculate traffic generation, parking requirements;
   4. The type and placement of signs, other than street name signs;
   5. The type and location of firefighting facilities;
   6. The nature and extent of cut and fill and degree of soil compaction, along with related engineering data;
   7. Plans and specifications for facilities for drainage of the lots, if any, and the sites, streets, highways, and alleys, including provisions of storm drainage, culverts, and appurtenant structures and reference to supplementary data for drainage;
   8. Plans and specifications for distribution and service lines for water supply to the building site; wells or other sources of supply;
   9. Plans and specifications for sewage and all liquid or solid waste storage and disposal facilities, including main and secondary collection lines and stub-offs from the secondary collection lines to the building site;
   10. The type, placement, and number of traffic safety signs and traffic-control devices;
   11. The type, placement, and number of lighting devices for parking lot and building lighting, including height, wattage, direction of illumination, and expected light intensity;
   12. Barricades and other safety devices;
   13. Complete landscaping and screening plans, including species and sizes of trees and shrubs proposed; and
   14. Complete plans for proposed sidewalks to service parking, recreation, and service areas.
3. Procedure for approval of site plans. Upon receipt of site plans, the Zoning Administrator shall refer copies of the same to the Police Department, the Fire Department, the City Engineer, and other city departments as are appropriate. Each of these departments shall within 15 days advise the Zoning Administrator whether the site plans are in conformance with the provisions of all applicable ordinances and policies of the city insofar as the same fall within the jurisdiction of each particular department. Upon receipt of the comments and advice from the aforementioned departments, the Zoning Administrator shall place the site plan review approval on the agenda of the next regularly scheduled Council meeting for Council action thereon.
4. Exceptions to site plan review procedure. An applicant may not have to present information required by Paragraph B in cases where the city staff determines that the application will not affect utilities (sewer, water, and storm sewer), traffic (off-street parking, circulation, access), safety precautions (lighting, pedestrian walks, traffic-control signs), or amenities (exterior design, landscaping, and screening).
   1. An applicant will not be required to file a separate site plan review under this section in cases where the site plan review is an integrated part of another independent review made by the city, i.e., conditional use application.
   2. Under circumstances to be determined by the city staff, an applicant may be permitted to file a partial site plan for that portion of his or her total project that will impact on any of the above- described subjects of concern to the city.
5. Building permits. Following approval of the site plans, the Building Inspector may grant building permits for proposed structures provided that the proposed structure meets the requirements of the city building code and all other applicable city ordinances and regulations.
6. Site plan review fees. The person applying for site plan approval shall fill out and submit an application, in the form prescribed by the city, to the Zoning Administrator. The application shall be accompanied by a fee as established by resolution of the City Council to cover administrative expenses relating to the site plan review.

1. Time of construction. No accessory building or structure shall be constructed on any lot prior to the time of construction of the principal building to which it is accessory.
2. Air conditioning units. Air conditioning units shall meet the noise standards as outlined in SLPC 16.40.010 Paragraph B.
3. Attached accessory buildings. In case an accessory building is attached to the main building, it shall be made structurally a part of the principal building and shall comply in all respects with the requirements of this title applicable to the principal building.
4. Detached accessory buildings. A detached accessory building shall not be located in any required front or side yard setback. A detached accessory building shall not be closer than eight feet to the principal building, except as otherwise provided in this title.
5. Rear yard requirements for accessory buildings.
   1. No single detached accessory building exceeding either one story or 12 feet in height shall occupy more than 30% of the area of any rear yard. Further, no detached accessory building shall be located within five feet of any rear lot line in an R-1 classification or within 15 feet of any rear lot line in an R-2 or R-3 classification.
   2. The sum total of land occupied by all accessory buildings shall not exceed 40% of the area of the required rear yard, but in no case greater than 1,200 square feet.
6. Height requirements. No accessory building shall exceed 18 feet in height or the height of the principal structure, whichever is less.
7. Additional accessory uses. The following accessory uses, in addition to those specified, shall be permitted in any residence district, if the accessory uses do not alter the character of the premises in respect to their use for the purposes permitted in the district:
   1. The operation of necessary facilities and equipment in connection with schools, colleges, universities, hospitals, and other institutions permitted in the district;
   2. Recreation, refreshment, and service buildings in public parks and playgrounds; and
   3. Fallout shelters.
8. Satellite receive-only antennas. Satellite receive-only antennas (SROA) shall be a permitted accessory use in all districts, subject to the following regulations:
   1. Free-standing SROA. In all zoning districts within the city, SROA shall be subject to the same front, rear, and side yard setback requirements which would apply to other accessory structures within the district; and
   2. Roof-mounted SROA. SROA mounted on roofs shall be subject to the normal height limits of the zoning district in which each is located and shall comply with all applicable requirements of the Uniform Building Code.

1. District requirements. Yard requirements shall be specified for each district in this title.
2. Extent of front yards. Except for driveways, the front yard shall extend along the entire frontage of the lot and along both streets in the case of a double frontage or corner lot.
3. Walls, fences, and hedges. A wall, fence, or hedge may occupy part of the required front, side, or rear yards.
4. Double frontage lots. On double frontage lots, the required front yard shall be provided on both streets.
5. Corner lots.
   1. The required front yard of a corner lot shall remain free of any wall, fence, structure, tree, shrub, or growth that does not maintain at least 75 percent transparency and could obstruct visibility, creating a traffic hazard. Chain link or decorative fencing that maintains at least 75 percent transparency may be allowed, provided it does not exceed a height of 48 inches from grade level at the lot line. The sight triangle is defined as a triangle formed by two sides measuring 30 feet along the curb lines from the intersection of two intersecting streets, with the third side being a straight line connecting the endpoints of these measurements.
   2. In all instances, there shall be a minimum of 25 feet side yard setback when abutting a street.
      
      Cross-reference:
      Intersection Sight Triangle, see SLPC 16.64.040
6. Rear yards opening onto alleys. In determining the depth of rear yard for any building where the rear yard opens into an alley, one-half of the width of the alley, but not exceeding ten feet, may be considered as a portion of the rear yard, subject to the following qualifications:
   1. The depth of any rear yard shall not be reduced to less than ten feet by the application of this exception; and
   2. If the door of any building or improvement, except a fence, opens toward an alley, it shall not be erected or established closer to the center line of an alley than a distance of 15 feet.
7. Exemptions to yard regulations. Measurements for yards required in each district shall be taken from the nearest point of the wall of a building to the lot line in question, subject to the following qualifications:
   1. Cornices, canopies, or eaves may be extended into the required front yard a distance not exceeding four feet, six inches;
   2. Fire escapes may extend into the required front yard a distance not exceeding four feet, six inches;
8. A landing place or uncovered porch may extend into the required front yard a distance not exceeding six feet, if the landing place or porch has its floor no higher than the entrance floor of the building. An open railing may be placed around the place;
   1. A covered porch may extend into the required front yard a distance not exceeding six feet, if the landing place or porch has its floor no higher than the entrance floor of the building and is not enclosed with windows, screens or the like. The covered area shall not exceed 60 square feet and shall be architecturally compatible (siding, roof material, roof pitch, and the like) with the principal structure. An open railing may be placed around the porch.
   2. The above enumerated architectural features may also extend into any side or rear yard to the same extent, except that no porch, terrace, or outside stairway shall project into the required side yard distance.

1. Setbacks and existing buildings. When more than 25% of the frontage of the side of the street between intersections is occupied by structures having setbacks from street rights-of-way of a greater or lesser amount than hereinafter required, the majority setback of all existing buildings between the intersections shall be maintained by all new or relocated structures. In the event a building is to be built where there is such an established setback different from that required hereinafter and there are existing buildings on both sides of the new building, the front setback shall not be required to be greater than the average setback of the first adjacent building on each side.
2. Maximum lot coverage. Principal and accessory structures shall not cover more than 35% of any zoning lot located in the R-1 and R-2 Districts. Principal and accessory structures shall not cover more than 50% of any zoning lot located in the R3 District.
3. Impervious surface coverage. Impervious surfaces shall not cover more than 50% of any zoning lot located in the R-1 and R-2 Districts, and not more than 60% in the R-3 District. Impervious surfaces shall not cover more than 75 % of any zoning lot located in the commercial or industrial districts. The remainder of the zoning lot shall be covered with turf grass, native grasses, perennial flowering plants, shrubs, trees or similar landscape material sufficient to prevent soil erosion, minimize off-site stormwater runoff, and encourage natural filtration function.

1. All open areas of any lot shall either be open landscaped with trees, shrubs, and planted ground cover or left in a natural state, except as provided in SLPC 14.16.080.
2. A reasonable attempt shall be made to preserve as many existing trees as is practicable and to incorporate them into the site plan.
3. All new landscape trees and shrubs must meet the American Standard for Nursery Stock and American National Standard relating to planting guidelines, quality of stock and appropriate sizing of the root ball. Landscape trees must be balled and burlapped or moved from the growing site by tree spade. Deciduous trees will be not less than one and one quarter inches but not more than three inches caliper for balled and burlapped trees, and not less than three inches but not more than six inches caliper for spade-moved trees. Coniferous trees will not be less than six feet in height but no more than eight feet for balled and burlapped trees, and not less than eight feet in height but not more than 14 feet for spade-moved coniferous trees. The city may allow larger balled and burlapped or spade moved trees if these trees are accompanied with a three year guarantee.
4. All site areas not covered by buildings, sidewalks, parking lots, driveways, patios or similar hard surface materials shall be covered with sod or an equivalent ground cover approved by the city. This requirement shall not apply to site areas retained in a natural state.
5. In order to provide for adequate maintenance of landscaped areas, an underground sprinkler system shall be provided as part of each new development, except one- and two-family dwellings and additions to existing structures which do not at least equal the floor area of the existing structure. A sprinkler system shall be provided for all landscaped areas except areas to be preserved in a natural state.
6. Not more than 25% of the required number of trees shall be composed of one species unless approved by the city. No required tree shall be any of the following:
   1. A species of the genus ulmus (elm), except those elms bred to be immune to dutch elm disease;
   2. Box elder;
   3. Eastern cottonwood;
   4. Lombardy poplar;
   5. Ash;
   6. Black locust; or
   7. Female ginkgo.
7. Boulevard areas shall be landscaped in accordance with SLPC 14.16.080.
8. Landscape plan. Landscape plans shall be prepared by a landscape architect or other qualified person acceptable to the Zoning Administrator, drawn to a scale of not less than one inch equals 50 feet and shall show the following:
   1. Boundary lines of the property with accurate dimensions;
   2. Locations of existing and proposed buildings, parking lots, roads and other improvements;
   3. Proposed grading plan with two foot contour intervals;
   4. Location, approximate size and common name of existing trees and shrubs;
   5. A planting schedule containing symbols, quantities, common and botanical names, size of plant materials, root condition and special planting instructions;
   6. Planting details illustrating proposed locations of all new plant material;
   7. Locations and details of other landscape features including berms, fences and planter boxes;
   8. Details of restoration of disturbed areas including areas to be sodded or seeded;
   9. Location and details of irrigation systems; and
   10. Details and cross sections of all required screening.
9. General requirements. General requirements that shall apply in all multiple-family residential, business, and industrial districts include the following:
   1. Plant diversity. The landscape plan design shall, at a minimum, provide at least three of the following required numbers of trees and shrubs in addition to any trees and shrubs as required by this title for screening:
      1. One overstory tree per 3,000 square feet of open area.
      2. One ornamental tree per 1,500 square feet of open space.
      3. One evergreen tree per 3,000 square feet of open area.
      4. One deciduous or evergreen shrub per 100 square feet of open area.
   2. Building perimeter landscaping. At least 50% of the total building perimeter shall be sodded or landscaped with approved ground cover, shrubbery and trees in an area of no less than six feet in width.
   3. Heat island reduction. To minimize impact on microclimate, human and wildlife habitat, shading of parking lots is required. At least one overstory tree shall be planted for every ten parking stalls on site. To satisfy this requirement trees must be located at least four feet and within ten feet of a curb adjacent to any internal parking or drive area. Said trees shall count toward meeting the overall site green space and landscaping requirements identified by this title for the underlying zoning district.
   4. Buffer yards.
      1. Buffer yard location. Where any business or industrial use (i.e., structure, parking or storage) abuts a residential zone or use, such business or industry shall provide a buffer yard and screening along the boundary of the residential property. The buffer area and screening shall also be provided where a business or industry is across the street from a residential zone or use, but not on that side of a business or industry considered to be the front as defined by the city.
      2. Buffer yard design. Except in areas of steep slopes or where natural vegetation is acceptable, as approved by the city, buffer yards shall contain a combination of earth berms, plantings, or privacy fencing of a sufficient density to provide a minimum visual screen and a reasonable buffer to the following heights:
      3. Plantings. All designated buffer yards must be seeded or sodded except in areas of steep slopes where natural vegetation is acceptable as approved by the city. All plantings within designated buffer yards shall adhere to the following:
         1. Planting screens shall be fully irrigated, consist of healthy, hardy plants, a minimum of six feet in height and designed to provide year round visual obstruction of the item(s) to be screened pursuant to requirements of this title;
         2. Plant material centers shall not be located closer than five feet from the fence line and property line, and shall not conflict with public plantings, sidewalks, trails, etc.;
         3. Landscape screen plant material shall be in two or more rows. Plantings shall be staggered in rows unless otherwise approved by the city;
         4. Shrubs shall be arranged to lessen the visual gaps between trees. Along arterial streets, all plantings of deciduous trees shall be supplemented with shrubs such that the buffer yard contains a continuous band of plants;
         5. Deciduous shrubs shall not be planted more than four feet on center, and/or evergreen shrubs shall not be planted more than three feet on center; and
         6. Deciduous trees intended for screening shall be planted not more than 40 feet apart. Evergreen trees intended for screening shall be planted not more than 15 feet apart.
      4. Walls and fences. All walls and fences erected within designated buffer yards shall meet the following conditions:
         1. A screening fence or wall shall be constructed of attractive, permanent finished materials compatible with those used in construction of the permanent structure. Such screens shall be at least six feet in height and 100% visual obstruction of the item(s) to be screened pursuant to requirements of this title.
         2. Fences may be exposed no more than a maximum length of 20 feet between landscaping areas or clusters.
         3. For interior lots, a gate constructed of the same material as the fence shall be provided in the wall or fence to allow for maintenance of the street side boulevard.
         4. Fences and landscaping shall not be located within the traffic sight visibility triangle.
      5. Earth berms. Earth berms shall adhere to the following:
         1. Except in areas of steep slopes or where other topographic features or physical characteristics will not permit, as determined by the City Engineer, an earth berm shall be installed in all designated buffer yards in accordance with the following requirements:
            1. Berms shall be a minimum of four feet in height.
            2. The slope of the earth berm shall not exceed a three to one (3:1) slope unless approved by the City Engineer.
            3. The earth berm shall contain no less than four inches of topsoil.
10. Parking lot landscaping requirements. The following shall apply to all new development and redevelopment of parking lots for expansions creating 5,000 square feet or more of impervious surface or disturbance of one-half acre or more of land.
    1. Parking lot screening. Parking lot screening shall be designed to reduce the visual impact of surface parking lots; mitigate glare from headlights; improve the aesthetic quality of the area for users of the site, adjacent sites, roadways, and sidewalks; and define the perimeter of the parking lot as follows:
       1. Off-street parking containing six or more parking spaces. Between those portions of an off street parking area containing six more parking spaces and a different zoning district or a public street.
       2. Waiver. Parking lot screening requirements may be waived in circumstances where perimeter screening is provided or where the elevation of the parking area relative to the elevation of the street and sidewalk would make the screening ineffectual as determined by the Zoning Administrator.
       3. Parking lot screening standards.
          1. Parking lot screening must be provided within ten feet of the perimeter of the parking lot to be screened, except for parking lots adjacent to rain gardens/bioretention systems, other landscape features, or where the traffic sight visibility triangle may be impacted.
          2. Parking lot screening shall be a minimum of three feet and a maximum of four feet in height as measured from the adjacent finished surface of the parking area. When shrubs are used to provide the screen, such shrubs must be at least two feet tall at planting and anticipated to grow to at least three feet tall at maturity.
          3. No landscaping or screening shall interfere with driver or pedestrian visibility for vehicles entering or exiting the premises.
          4. Screening for a parking lot may be comprised of 100% evergreen planting materials.
       4. Content. Parking lot screening must consist of at least two of the following:
          1. A compact hedge of evergreen or densely twigged deciduous shrubs spaced to ensure closure into a solid hedge at maturity;
          2. A berm with plantings described above;
          3. Transit shelters, benches, bicycle racks and similar features may be integrated as a part of the screen;
          4. Fencing may be integrated as part of the screen. All wood fencing shall be stained and sealed with a weatherproof product.
    2. Parking island design. Off-street parking areas with at least 25 parking stalls shall contain interior landscaped islands. Such islands shall be bounded by a raised concrete curb or approved equivalent and shall contain mulch (wood, bark, or decorative rock) or turf grass to retain soil moisture. This provision shall not apply to parking structures. The standards for landscape islands are as follows:
       1. Landscape parking lot islands shall be required at the beginning and end of each parking row and shall contain a minimum of 180 square feet and a minimum width of nine feet.
       2. A minimum of one overstory tree shall be provided for each island. This provision may be waived for islands utilized for stormwater management or other utility or safety issues as determined by the City Engineer.
       3. Shrubs, perennials or ornamental grass shall be incorporated in each landscaped island.
       4. Islands shall be prepared with topsoil to a depth of two feet and improved to ensure adequate drainage, nutrient and moisture retention levels for the establishment of plantings.
       5. All perimeter and interior landscaped areas in parking lots shall be equipped with a permanent irrigation system, unless drought tolerant plant materials are used exclusively. Where drought tolerant plant materials are used, irrigation shall be required only for the two-year period following plant installation and may be accomplished using hoses, water trucks, or other nonpermanent means.

1. No lot shall be developed and no use permitted that results in water run-off causing flooding or erosion on adjacent properties. Driveways shall drain to the street.
2. The finished grade at the perimeter of principal buildings on lots shall average a height above center of street of one-half inch per foot of required setback, with a minimum of 24 inches, to assure adequate drainage of rain water from roofs away from the building.

1. Materials, supplies, and merchandise. All materials, supplies, merchandise, or other similar matter not on display for direct sale, rental, or lease to the ultimate consumer or user shall be stored within a completely enclosed building within the commercial and industrial districts or within the confines of an opaque wall or fence not less than six feet high. Merchandise which is offered for sale as described above may be displayed beyond the confines of a building in the commercial and industrial districts, but the area occupied by the outdoor display shall not constitute a greater number of square feet than 10% of the ground floor area of the building housing the principal use, unless the merchandise is of a type customarily displayed outdoors such as garden supplies. No storage of any type shall be permitted within the required front or side street setback.
2. Motor and recreational vehicles.
   1. Motor vehicles.
      1. Off-street parking of commercial vehicles is prohibited in any residential district, with the following exceptions:
         1. Commercial trucks with up to one ton carrying capacity;
         2. Tractors used for pulling trailers; and
         3. Commercial buses, but only if parked as part of an ongoing trip for hire
      2. One commercial vehicle of this type per residence is permitted under this section. Temporary parking for delivery or unloading is excepted from this section.
   2. Recreational vehicles. No recreational vehicle, trailer or boat shall be parked or stored for more than 30 days in any residential district except as follows:
      1. A trailer may be used as a temporary office or shelter incidental to construction on or development of the premises on which the trailer is located during the time construction or development is actively under way.
      2. The following recreational vehicles, trailers and boats may be parked or stored on a lot in the R-1 district and may be parked or stored by a tenant only in the R-2 and R-3 districts, provided they are not used or occupied for living, sleeping, housekeeping, or business purposes, and provided they are parked or stored so as to meet the following criteria:
         1. One recreational vehicle may be parked within the front yard setback provided that the vehicle may not be parked closer than five feet to the side yard property line except by variance granted pursuant to this code, and then only upon an approved driveway;
         2. Travel trailers, pickup coaches, motorized homes, and camping trailers, constructed as temporary dwellings for travel purposes, not exceeding 300 square feet; and
         3. Boats and trailers not exceeding 30 feet in length.
      3. Any recreational vehicle, trailer or boat may be parked anywhere on the premises for temporary loading or unloading purposes.
3. General parking regulations for single- and two-family residential districts. No owner or tenant of a single- or two-family residential property shall allow any motor vehicle or trailer to be parked on the property, outside of a garage, except on an approved driveway, with the exception of those motor and recreational vehicles covered under Paragraph B. Every motor vehicle or trailer which is parked outside of the garage shall display license plates with current registration tags. No motor vehicle or trailer shall be permitted to park in the sight triangle which is required under SLPC 16.28.030 Paragraph F.

All areas within the corporate limits of the city which are under water and not shown as included within any district shall be subject to all of the regulations of the district which immediately adjoins the water area. If the water area adjoins two or more districts, the boundaries of each district shall be construed to extend into the water area in a straight line until they meet the other district at a halfway point.

Height limitations set forth elsewhere in this title may be increased by 100% by conditional use permit when applied to the following: chimneys, cooling towers, elevator bulkheads, fire towers, monuments, penthouse sheds, water towers, stacks, stage towers or scenery lofts, tanks, ornamental towers and spires, wireless towers, or necessary mechanical appurtenances usually required to be placed above the roof level and not intended for human occupancy. Application for this permit shall be subject to regulations of SLPC 16.56.010, regarding conditional use permits.

1. Conditional use permit required. A conditional use permit shall be required in all cases where excavation, grading, and filling of any land within the city would result in a substantial alteration of existing ground contour or would change existing drainage or would cause flooding or erosion or would deprive an adjoining property owner of lateral support and would remove or destroy the present cover resulting in less beneficial cover for present and proposed development, uses, and enjoyment of any property in the city. Substantial alteration shall be defined as the extraction, grading, or filling of land involving movement of earth and materials in excess of 25 cubic yards. Land within the city that is substantially altered by excavation, grading, or filling, which work is performed pursuant to the issuance of a building permit, is excepted from the conditional use requirements of this section.
2. Application. Application for a land alteration conditional use permit shall be subject to the regulations of SLPC 16.56.010 and shall contain the following additional information:
   1. The legal description of the land to be altered;
   2. The nature of the proposed alteration and future use of the property;
   3. The starting date and approximate completion date of the operation;
   4. The names of all owners of the land to be altered; and
   5. The names and addresses of all owners and occupants of the adjoining land that may be affected by the land alteration.
3. Bond. The City Council may require from the person securing a land alteration conditional use permit, adequate proof of bonding in the form of a performance bond, sufficient in value to cover the expense of the completion of the development plan or to bring such portion of the completed project to a safe grade and elevation so as to be healthful and safe to the general public and to provide safe and adequate drainage to the site.
4. Safety precautions. If, during the land alteration work, it becomes necessary for the person altering the land to create a condition of grade or drainage not in the interest of health or safety, it shall become that person's duty to correct, immediately, the dangerous situation created, as well as fence that area from the general public during the period of danger.
5. Replacement of landscaping. The person responsible for the proposed land alteration shall agree to replace cover that has been removed, by seeding or sodding the cover to be replaced within 30 days after completion of grading. Where construction of dwellings or buildings is being done over an extended period of time, the Zoning Administrator or City Council may require replacement of ground cover on a portion of the area before the entire project is completed.
6. Declaration as public nuisance. The City Council may, in addition to any or all other remedies available for violation of this title, declare the premises a public nuisance and after a public hearing held upon ten days' notice by registered mail to the last known address of the owner or owners of the property, proceed to have the necessary work done to bring the land to reasonable standards of health and safety and assess all of the costs and expenses thereof against the property.

Whenever any street, alley, or other public way is vacated by official action of the city, the zoning district adjoining each side of the street, alley, or public road shall be automatically extended to the center of the vacation, and all area included in the vacation shall then and henceforth be subjected to all appropriate regulations of the extended districts.