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Sanborn City Zoning Code

DISTRICTS

170.40 AG - AGRICULTURAL DISTRICT.

1.   Intent. This district is designed to preserve lands best suited for agricultural use from encroachment of incompatible uses, and to preserve in agricultural use land suited to eventual development in other uses pending proper timing for practical and economical provisions of utilities, major streets, schools, and other facilities so that reasonably compact development will occur and the fiscal integrity of the City preserved. A change of zoning from AG to any other classification shall be in accordance with planning practices established by the Commission.
2.   Permitted Uses. The following uses are permitted in the AG District:
   A.   Agriculture including the raising of field crops, horticulture.
   B.   Ranch and farm dwellings pertaining to agricultural operations.
   C.   Parks and recreational areas operated by the City or other political subdivision.
   D.   Riding academies.
   E.   Country clubs, as defined herein, when located on a lot of at least five acres.
   F.   Recreational camps operated by public, charitable, or religious organizations.
   G.   Buildings and installations geographically necessary to operate a public utility, but not including general offices, material yards, or repair shops. Such facilities shall observe yard space rules, but shall not be required to provide the full lot size and lot width requirements.
   H.   Railroad through or spur tracks, but no siding or other terminal type facilities and no service repair or administrative facilities.
   I.   Greenhouses and nurseries.
   J.   Kennels.
3.   Accessory Uses. Uses of land or structure customarily incidental and subordinate to a permitted use in the AG District including, but not limited to, the following:
   A.   Living quarters for persons regularly employed on the premises, but not including labor camps or dwellings for transient labor.
   B.   Guest houses, not rented or otherwise conducted as a business.
   C.   General home occupations.
   D.   Offices incidental to and necessary for conducting a permitted use.
   E.   Private garages, stables, and barns.
   F.   Roadside stands, not exceeding 400 square feet in floor area, for the sale of agricultural products grown on the premises.
   G.   Nameplates and non-illuminated signs, not to exceed 20 square feet in area, identifying the premises but not containing over 20 percent brand advertising.
   H.   The keeping of not more than two roomers or boarders.
   I.   Other accessory uses and buildings customarily appurtenant to a permitted use.
4.   Special Exceptions. Certain uses may be permitted in the AG District subject to specific conditions and requirements intended to make them compatible with and acceptable to adjacent uses:
   A.   Quarters for transient labor.
   B.   Cemeteries, crematories, mausoleums, or columbariums.
   C.   Commercial mines, quarries and sand and gravel pits.
   D.   Par-3 golf courses.
   E.   Public and quasi-public buildings and structures and uses of an administrative, educational, religious, cultural, or public service type including colleges.
   F.   Local utility services.
   G.   Railroad through and spur tracks.
   H.   Animal husbandry, feedlots, and poultry operations.
5.   Bulk Regulations. The following requirements shall provide for light and air around permitted uses and buildings in the AG District:
 
Min. Lot Area (acres)
Min. Lot Width (feet)
Min. Front Yard (feet)
Min. Side Yard (feet)
Min. Side Yard, Street Side of Cor.
Min. Rear Yard (feet)
Max. Ground Coverage
Max. Height (feet)
10
150
35
20
25
35
10 percent (including accessory buildings)
35
 
6.   Miscellaneous Provisions.
   A.   Off-street parking space shall be provided for all uses established in this zone.
   B.   Only one building for living purposes shall be permitted on one zoning lot except as otherwise provided herein.

170.42 RS-90 - SINGLE-FAMILY RESIDENCE DISTRICT (9,000 SQUARE FOOT ZONE).

1.   Intent. This zone is designed to stabilize and protect the residential characteristics of the district and to encourage a suitable family life on medium size lots. More uses are allowed as a matter of right throughout the zone than in the larger lot size zones.
2.   Permitted Uses. The following uses are permitted in the RS-90 District:
   A.   Single-family detached dwellings.
   B.   Public, parochial, and private schools and colleges offering courses of general instruction when located on sites of at least five acres, and including convents, monasteries, dormitories, and other related living structures when located on the same site as the school or college.
   C.   Parks and recreation areas operated by the City or other political subdivision.
   D.   Public and quasi-public buildings for cultural uses.
   E.   Country clubs as defined herein.
3.   Accessory Uses. Uses of land or structure customarily incidental and subordinate to a permitted use in the RS-90 District including, but not limited to, the following:
   A.   Private garages and private parking areas.
   B.   Limited home occupations.
   C.   Private swimming pools exclusively for the use of residents of the premises and their non-paying guests and subject to any other regulations or ordinances of the City.
   D.   The parking of one unoccupied trailer or self-propelled camper designed for recreational use and not to exceed 36 feet in length within a building, or in the open in a rear yard but subject to any permits required by law or ordinance.
   E.   The storage of one pleasure boat on a trailer within a building, or in the open in the rear yard.
   F.   Other accessory uses and structures customarily appurtenant to a permitted use.
4.   Special Exceptions. Certain uses may be permitted in the RS-90 District subject to specific conditions and requirements intended to make them compatible with and acceptable to adjacent uses:
   A.   Local utility service.
   B.   Churches, synagogues, chapels, and similar places of worship and instruction.
   C.   Utility substations.
   D.   Railroad through and spur tracks, but no sidings or other terminal type facilities and no service, repair, or administrative facilities and only after a showing before the Board that such facilities are necessary in the location proposed.
   E.   The growing of field crops.
5.   Bulk Regulations. The following requirements shall provide for light and air around permitted uses and buildings in the RS-90 District:
 
Min. Lot Area (sq. ft.)
Min. Lot Width (feet)
Min. Front Yard (feet)
Min. Side Yard (feet)
Min. Side Yard, Street Side of Cor.
Min. Rear Yard (feet)
Max. Ground Coverage
Max. Height (feet)
9,000
75
30
10
20
30*
25 percent (including accessory buildings)
35
 
*Except those lots with an alley as the rear property line may have a garage or an accessory building not exceeding 680 sq. ft. for garages or 144 sq. ft. for accessory buildings located within two feet of the rear property line. Those lots without an alley as the rear property line may have a garage not exceeding 680 sq. ft. or an accessory building not exceeding 144 sq. ft. located within 10 feet of the rear property line.
6.   Miscellaneous Provisions.
   A.   Off-street parking shall be provided for all uses established in the residential zone.
   B.   Only one building for living purposes shall be permitted on one zoning lot, except as otherwise provided herein.

170.44 RD-60 - DUPLEX RESIDENCE DISTRICT (6,000 SQUARE FOOT ZONE).

1.   Intent. This zone is designed to provide for one and two dwelling areas on lots of moderate size.
2.   Permitted Uses. The following uses are permitted in the RD-60 District:
   A.   Single-family detached dwellings.
   B.   Residential buildings containing not more than two dwelling units.
   C.   Public, parochial, and private schools and colleges offering courses of general instruction when located on sites of at least five acres, and including convents, monasteries, dormitories, and other related living structures when located on the same lot as the school or college.
   D.   Parks and recreation areas operated by the City or other political subdivision.
   E.   Public and quasi-public buildings for cultural uses.
   F.   Country clubs.
3.   Accessory Uses. Uses of land or structure customarily incidental and subordinate to a permitted use in the RD-60 District including, but not limited to, the following:
   A.   General home occupations.
   B.   Private garages and parking areas.
   C.   Private swimming pools exclusively for the use of residents of the premises and their non-paying guests and subject to any other regulations or ordinances of the City.
   D.   The parking of one unoccupied trailer or self-propelled camper designed for recreational use and not to exceed 36 feet in length within a building, or in the open in a rear yard but subject to any permits required by law or ordinance.
   E.   The storage of one pleasure boat on a trailer within a building.
   F.   Other accessory uses and structures customarily appurtenant to a permitted use.
4.   Special Exceptions. Certain uses may be permitted in the RD-60 District subject to specific conditions and requirements intended to make them compatible with and acceptable to adjacent uses:
   A.   Utility substations.
   B.   Railroad through and spur tracks, but no sidings or other terminal type facilities and no service, repair, or administrative facilities and only after a showing before the Board that such facilities are necessary in the location proposed.
   C.   Fraternity and sorority houses when directly associated with a college or university.
   D.   Buildings of non-profit community organizations and social welfare establishments other than those providing living accommodations.
   E.   Churches, synagogues, chapels, and similar places of religious worship and instruction of a quiet nature when located in a substantial structure.
   F.   The growing of field crops.
5.   Bulk Regulations. The following requirements shall provide for light and air around permitted uses and buildings in the RD-60 District:
 
Min. Lot Area
Min. Lot Width (feet)
Min. Front Yard (feet)
Min. Side Yard (feet)
Min. Side Yard, Street Side of Cor.
Min. Rear Yard (feet)
Max. Ground Coverage
Max. Height (feet)
6,000 sq. ft. for single-family dwellings; 4,000 sq. ft. for each dwelling unit in excess of one
50
30
5
15
25*
40 percent
35
 
*Except those lots with an alley as the rear property line may have a garage or an accessory building not exceeding 680 sq. ft. for garages or 144 sq. ft. for accessory buildings located within two feet of the rear property line. Those lots without an alley as the rear property line may have a garage not exceeding 680 sq. ft. or an accessory building not exceeding 144 sq. ft. located within 10 feet of the rear property line.

170.46 RG-20 - GENERAL RESIDENCE DISTRICT (2,000 SQUARE FOOT ZONE).

1.   Intent. This zone is designed to provide for moderately high density apartment development and other uses which have characteristics similar to those found in the operation of apartment houses.
2.   Permitted Uses. The following uses are permitted in the RG-20 District:
   A.   Single-family detached dwellings.
   B.   Multiple dwellings containing not more than 12 dwelling units.
   C.   Parks and recreation areas operated by the City or other political subdivisions.
   D.   Public and quasi-public buildings for cultural uses.
   E.   Country clubs.
   F.   Hospitals and rest homes, nursing homes.
   G.   Rooming houses and boarding houses.
   H.   Apartment hotels.
   I.   Private clubs, fraternity houses, sorority houses, lodges, and similar establishments, but specifically excluding those establishments which have a name or legal basis as the aforesaid, but are in fact operated as a business enterprise, and also excluding concessions associated with the aforesaid which are operated as a business enterprise.
   J.   The offices of one or more professional persons engaged in the activities which generate a limited amount of contact with the general public, but including medical clinics, offices of lawyers, accountants, architects, planners, engineers, and similar professions.
   K.   Buildings of non-profit community organizations and social welfare establishments.
3.   Accessory Uses. Uses of land or structure customarily incidental and subordinate to a permitted use in the RG-20 District including, but not limited to, the following:
   A.   Private garages and private parking areas.
   B.   Private swimming pools exclusively for the use of residents of the premises and their non-paying guests and subject to any other regulations or ordinances of the City.
   C.   The parking of one unoccupied trailer or self-propelled camper designed for recreational use and not to exceed 36 feet in length within a building, or in the open in a rear yard but subject to any permits required by law or ordinance.
4.   Special Exceptions. Certain uses may be permitted in the RG-20 District subject to specific conditions and requirements intended to make them compatible with and acceptable to adjacent uses:
   A.   Utility substations.
   B.   Railroad through and spur tracks, but no sidings or other terminal type facilities and no service, repair, or administrative facilities and only after a showing before the Board that such facilities are necessary in the location proposed.
   C.   Office buildings for the conduct of the administrative business of a single company when such business does not deal with the public directly from the site of such office building.
   D.   Mortuaries, funeral homes, and funeral chapels.
   E.   Public, parochial, and private schools and colleges offering courses of general instruction when located on sites of at least five acres, and including convents, monasteries, dormitories, and other living structures when located on the same site as the school or college.
   F.   Churches, synagogues, chapels, and similar places of religious worship and instruction of a quiet nature when located in a substantial structure.
   G.   The growing of field crops.
5.   Bulk Regulations. The following requirements shall provide for light and air around permitted uses and buildings in the RG-20 District:
 
Min. Lot Area Per Dwelling Unit
(sq. ft.)
Min. Zoning Lot
(sq. ft.)
Min. Lot Width (feet)
Min. Front Yard (feet)
Min. Side Yard (feet)
Min. Side Yard, Street Side of Cor.
Min. Rear Yard (feet)
Max. Ground Coverage
Max. Height (feet)
2,000*
6,000
50
30
5
10
10**
80 percent (including accessory buildings)
75
 
*Except that residential buildings containing one dwelling unit shall have a minimum lot area of 6,000 sq. ft. and residential buildings containing 2, 3, or 4 dwelling units shall have a minimum lot area of 2,500 sq. ft. per dwelling unit.
**Except those lots with an alley as the rear property line may have a garage or an accessory building not exceeding 680 sq. ft. for garages or 144 sq. ft. for accessory buildings located within two feet of the rear property line. Those lots without an alley as the rear property line may have a garage not exceeding 680 sq. ft. or an accessory building not exceeding 144 sq. ft. located within 10 feet of the rear property line.

170.48 ER - EXISTING RESIDENTIAL DISTRICT.

1.   Intent. This district is intended to provide for an area of City with minimum development regulations. This district is to be located in portions of the City which have been developed prior to the adoption of these zoning regulations.
2.   Permitted Uses. The following uses are permitted in the ER District:
   A.   Single-family detached dwellings.
   B.   Multiple dwellings containing not more than 12 dwelling units.
   C.   Parks and recreation areas operated by the City or other political subdivisions.
   D.   Public and quasi-public buildings for cultural uses.
   E.   Country clubs.
   F.   Hospitals and rest homes, nursing homes.
   G.   Rooming houses and boarding houses.
   H.   Apartment hotels.
   I.   Private clubs, fraternity houses, sorority houses, lodges, and similar establishments, but specifically excluding those establishments which have a name or legal basis as the aforesaid, but are in fact operated as a business enterprise, and also excluding concessions associated with the aforesaid which are operated as a business enterprise.
   J.   The offices of one or more professional persons engaged in the activities which generate a limited amount of contact with the general public, but including medical clinics, offices of lawyers, accountants, architects, planners, engineers, and similar professions.
   K.   Buildings of non-profit community organizations and social welfare establishments.
3.   Accessory Uses. Uses of land or structure customarily incidental and subordinate to a permitted use in the ER District including, but not limited to, the following:
   A.   Private garages and private parking areas.
   B.   Private swimming pools exclusively for the use of residents of the premises and their non-paying guests and subject to any other regulations or ordinances of the City.
   C.   The parking of one unoccupied trailer or self-propelled camper designed for recreational use and not to exceed 36 feet in length within a building, or in the open in a rear yard but subject to any permits required by law or ordinance.
4.   Special Exceptions. Certain uses may be permitted in the ER District subject to specific conditions and requirements intended to make them compatible with and acceptable to adjacent uses:
   A.   Utility substations.
   B.   Railroad through and spur tracks, but no sidings or other terminal type facilities and no service, repair, or administrative facilities and only after a showing before the Board that such facilities are necessary in the location proposed.
   C.   Office buildings for the conduct of the administrative business of a single company when such business does not deal with the public directly from the site of such office building.
   D.   Mortuaries, funeral homes, and funeral chapels.
   E.   Public, parochial, and private schools and colleges offering courses of general instruction when located on sites of at least five acres, and including convents, monasteries, dormitories and other living structures when located on the same site as the school or college.
   F.   Churches, synagogues, chapels, and similar places of religious worship and instruction of a quiet nature when located in a substantial structure.
   G.   The growing of field crops.
5.   Bulk Regulations. The following requirements shall provide for light and air around permitted uses and buildings in the ER District:
 
Min. Lot Area (sq. ft.)
Min. Zoning Lot
(sq. ft.)
Min. Lot Width (feet)
Min. Front Yard
Min. Side Yard (feet)
Min. Side Yard, Street Side of Cor.
Min. Rear Yard (feet)
Max. Ground Coverage
Max. Height (feet)
6,000
6,000
50
15 feet or in line with the two immediately adjacent, developed lots, whichever is the greater
5
12
25*
40 percent (including accessory buildings)
35
 
*Except those lots with an alley as the rear property line may have a garage or an accessory building not exceeding 680 sq. ft. for a garage or 144 sq. ft. for an accessory building located within two feet of the rear property line. Those lots without an alley as the rear property line may have a garage no exceeding 680 sq. ft. or an accessory building not exceeding 144 sq. ft. located within 10 feet of the rear property line.

170.50 CGB - CENTRAL GENERAL BUSINESS DISTRICT.

1.   Intent. To provide a general business district which will take into account the special characteristics of the Central Business District including the orientation to pedestrian traffic rather than vehicular traffic.
2.   Permitted Uses. The following uses are permitted in the CGB District:
   A.   Bakery or pastry shops employing not more than five persons on the premises, exclusive of drivers; bicycle sales and repair shops, but not including sales and repair of motor-driven vehicles; billboards and general advertising signs; bowling alley, trampoline or rebound equipment center, miniature golf, pool hall, dance hall, kiddy parks, skating rinks; building other than heavy storage and maintenance shops for municipal or governmental purposes; business and commercial schools; clinics for people only; dancing schools including group instruction; feed and seed store; frozen food lockers for individual or family trade, but no slaughtering, killing, eviscerating, skinning, plucking, or smoking on the premises; furniture and antique homes and stores including used furniture stores; garages for the storage of automobiles, but not including major repair, body and fender work or painting; greenhouses, commercial; nursery stock sales yards; loan office; extremely light, professional type manufacturing and repair of such items as eyeglasses, custom jewelry, prosthetic devices, and other similar services and manufacture; mortuaries, funeral homes, and funeral chapels; motel, hotel; general office buildings; commercial parking lots; pawn shops; pet shops; printing job when mechanical operation is not visible from a street and employing not over four persons; radio and television stations, except transmission towers over 35 feet high; stationary and office machine sales and service; tavern, cocktail lounge, club operated as a tavern or cocktail lounge; theater other than drive-in; upholstery shops; automatic vending structures when located on that portion of a lot in which a principal building is permitted.
   B.   Other retail and service establishments which may be determined by the Board of Adjustment to be similar to the above listed principal permitted uses and which are in harmony with the purpose of this district. Excluded is any use not listed as a permitted use in this district but is specifically listed as a permitted use in another district.
   C.   Residential structures and other structures and uses permitted in the RG-20 District when not in conformity with the space limits of the RG-20 District.
3.   Accessory Uses. Uses of land or structure customarily incidental and subordinate to a permitted use in the CGB District including, but not limited to, the following:
   A.   Accessory uses for residential development shall include those listed under the RG-20 District and shall be established and conducted in accordance with the regulations of that district.
   B.   Signs including illuminated signs.
   C.   Other accessories normally appurtenant to uses permitted in this district.
4.   Special Exceptions. Certain uses may be permitted in the CGB District subject to specific conditions and requirements intended to make them compatible with and acceptable to adjacent uses:
   A.   The Board of Adjustment may allow residential and mixed business and residential structures to conform with the space limits of the RG-20 District or any other district requiring more lot area per dwelling unit, upon a finding that the proposed density of residential use will be in harmony with nearby residential zoning, and when said mixed occupancy building is specifically designed and constructed for such mixed occupancy, but shall not include the construction of a business building in the yard of a residence or within an existing residence.
5.   Bulk Regulations. The following requirements shall provide for light and air around permitted uses and buildings in the CGB District:
 
Min. Lot Area for Business
Min. Lot Width (feet)
Min. Front Yard (feet)
Min. Side Yard (feet)
Min. Lot Area for Residences
None
None for business
None for business
5 feet when abutting any district requiring a side yard
Structures shall conform with the provisions of the RG-20 District, except as may be modified by the Board of Adjustment in accordance with the special exception provisions of this district.
Min. Side Yard, Street Side of Cor.
Min. Rear Yard (feet)
*Max. Ground Coverage
Max. Height (feet)
None
10
95 percent
35
 
*Including accessory buildings, loading docks, incinerators, and vending devices
6.   Miscellaneous Provisions.
   A.   Off-street loading shall be provided for all new buildings. Off-street parking may be provided by governmental or group action. It is not desired that each building supply parking space to meet its full demands on or adjacent to its site in that such an arrangement would tend to spread the CGB District over too large an area to make pedestrian communication and interchange inconvenient.
   B.   Only one building for living purposes shall be permitted on one zoning lot except as otherwise provided herein.

170.52 HSB - HIGHWAY SERVICE BUSINESS DISTRICT.

1.   Intent. This district is designed to provide for the effective use of land situated in relationship to major highways and highway interchanges so efficient grouping of activities can develop to serve the traveling public. Front yard requirements are designed to provide for the safety of the traveling public by provision for adequate off-highway maneuvering and parking space.
2.   Permitted Uses. The following uses are permitted in the HSB District:
   A.   Motels and motor hotels designed for accommodation of the traveling public, and including swimming pools, children’s play yards, golf putting greens, and similar uses when they are a part of said motel or motor hotel developments.
   B.   Restaurants and eating places, provided however, that no such establishment shall be operated as a restaurant or eating place in which more beer or other intoxicating beverages are sold than food. Taverns, bars, cocktail lounges, and similar establishments which require licensing for the dispensing of beverages shall be prohibited except as a part of and located in the same building as a restaurant or eating place specified above.
   C.   Gasoline service stations which do not conduct major automotive repairs, body or fender work, or automobile painting, and at which all used and waste materials are kept within a solid enclosure so that the contents are not visible from a street, highway, interstate highway, or other properties; gasoline pumps and other facilities shall be considered as structures and shall not be located within a required yard space.
   D.   Self-operated vending devices, provided such devices shall be placed for operation and stored behind the building line specified herein for conventional structures.
   E.   Drive-in configurations of any business otherwise permitted in this district, provided that any such establishment shall provide adequate off-street space for the maneuvering and storage of patrons’ vehicles, and further provided that there be a sturdy, close-woven or solid fence suitable for the retaining of any discarded paper or other material on all sides of the parking area except the front, and provided no music or loud speaker system shall be installed or operated that can be heard at neighboring residential motel or motor hotel properties, and providing all lighting shall be directed and shielded so as to light only the property of such establishments.
   F.   Light retail establishments such as: apparel, drug, variety, florist, gift, grocery, jewelry, small appliances, bakery, and dairy; provided, however, that these uses do not exceed 500 square feet of gross floor area and are incidental to the primary uses listed under Paragraphs A, B, and C above, of principal permitted uses.
   G.   Light service establishments such as: tailor, dressmaker, barber, beauty operator, dance studio (but excluding dance halls), real estate, insurance, photographer, professional offices (but excluding veterinary hospitals), self-service laundry, and dry cleaning.
   H.   Other light retail and service establishments which may be determined by the Board of Adjustment to be similar to the above listed uses and which are in harmony with the purposes of the district.
   I.   Single family residences, when not in a business building or on the same zoning lot as a business building or on the same zoning lot as a business building, and when in conformity with the space limits of the RD-60 District.
3.   Accessory Uses. Uses of land or structure customarily incidental and subordinate to a permitted use in the HSB District including, but not limited to, the following:
   A.   Accessory uses for residential development shall include those listed under the RD-60 District and shall be established and conducted in accordance with the regulations of that district.
   B.   Accessory uses for commercial development shall include those normally appurtenant to such development, except as further specified herein, and shall be located in accordance with the space limits of this district.
4.   Special Exceptions. Certain uses may be permitted in the HSB District subject to specific conditions and requirements intended to make them compatible with and acceptable to adjacent uses:
   A.   Local utility service.
   B.   Churches, synagogues, chapels, and similar places of worship and instruction.
   C.   Utility substations.
   D.   Railroad through and spur tracks, but no sidings or other terminal type facilities and not service, repair or administrative facilities and only after a showing before the Board of Adjustment that such facilities are necessary in the location proposed.
5.   Bulk Regulations. The following requirements shall provide for light and air around permitted uses and buildings in the HSB District:
 
Min. Lot Area for Business or Industry
Min. Lot Area for Residence
Min. Lot Width (feet)
Min. Front Yard
Min. Side Yard
10,000 sq. ft.
Conform to the provisions of the RD-60 District
None for business
25 feet from a street or highway right-of-way, except that one sign or decorative pylon may be placed at a property line or within the required yard space
None, except that no building shall be located closer than 25 feet from any street or highway right-of-way line except as provided herein
Min. Rear Yard
Max Ground Coverage
Max. Height (feet)
None
40 percent for business or industry
55
 
6.   Miscellaneous Provisions.
   A.   Off-street parking and loading shall be provided for all uses established in this district.
   B.   Only one building for living purposes shall be permitted on one zoning lot except as otherwise provided herein.

170.54 ML - LIGHT MANUFACTURING DISTRICT.

1.   Intent. This district provides for a wide range of commercial and industrial uses, all of which shall be able to meet comparatively rigid specifications as to nuisance-free performance. The district specifically excludes residences on the theory that the mixture of residential use, and the public service and facilities for residences with those for industry is contrary to the purposes of these regulations irrespective of whether the industry is encroaching on a living area or a living area is encroaching on an industrial area.
2.   Permitted Uses. The following uses are permitted in the ML District:
   A.   Any use allowed in the CGB District, except that all dwellings and other types of living accommodations shall be prohibited save that one quarters for a guard or caretaker shall be permitted as an accessory use for any permitted use occupying more than 20,000 square feet of lot area.
   B.   Any business, commercial, or industrial use which can meet the performance standards set forth for this district but not specifically excluded or specifically mentioned as belonging in another less restrictive district.
   C.   Agriculture, including the raising of field crops, horticulture, and animal husbandry. Feed lots, poultry farms, fur farms, and kennels shall be allowed when such activities shall meet the performance standards set forth for this district.
3.   Excluded Uses. The following uses are prohibited within the ML District:
   A.   Dwellings, except caretaker and guard quarters as set forth herein.
   B.   Public, parochial, and private schools and colleges, except trade schools.
   C.   Hospitals, clinics, rest homes, and other institutions for housing or care of human beings.
   D.   Motels, hotels, and mobile home parks.
   E.   Any use not enumerated as permitted in this district but which is specifically provided for in another district or districts.
4.   Accessory Uses. Uses of land or structure customarily incidental and subordinate to a permitted use in the ML District:
   A.   Any accessory use normally appurtenant to a permitted use shall be allowed provided such use shall conform with all performance standards set forth for this district.
5.   Special Exceptions. Certain uses may be permitted in the ML District subject to specific conditions and requirements intended to make them compatible with and acceptable to adjacent uses.
   A.   Recreation uses which are temporary in nature and do not involve any appreciable amount of fixed construction and which will not interfere with the efficient functioning of the district for its primary purpose of providing for manufacturing and heavy commercial establishments, may be allowed only upon appeal to the Board of Adjustment.
6.   Performance Standards. The following performance standards shall apply in the ML District:
   A.   Physical Appearance. All operations shall be carried on within an enclosed building except that new materials or equipment in operable condition may be stored in the open. Normal daily wastes of an inorganic nature may be stored in containers not in a building when such containers are not readily visible from the street. The provisions of this paragraph shall not be construed to prohibit the display of merchandise or vehicles for sale or the storage of vehicles, boats, farm machinery, trailers, mobile homes, or similar equipment when in operable condition.
   B.   Fire Hazard. No operation shall involve the use of highly flammable gases, acid, liquors, grinding processes, or other inherent fire hazards. This provision shall not be construed to prohibit the use of normal heating fuels and welding gases when handled in accordance with other ordinances of the City.
   C.   Noise. No operation shall be carried on which involves noise in excess of the normal traffic noise of the adjacent street at the time of the daily peak hour of traffic volume. Noise shall be measured at the property line. When the level of such noise cannot be determined by observation with the natural senses, a suitable instrument may be used and measurement may include breakdown into a reasonable number of frequency ranges. All noises shall be muffled so as to not be objectionable due to intermittence, beat, frequency, or shrillness.
   D.   Sewage and Liquid Wastes. No operation shall be carried on which involves the discharge into a sewer, water course or the ground of liquid wastes of any radioactive nature, or liquid wastes of a chemical nature which are detrimental to normal sewage plant operation or corrosive and damaging to sewer pipes and installations.
   E.   Air Contaminants.
      (1)   Air contaminants and smoke shall be less dark than designated Number One on the Ringleman Chart as published by the U.S. Bureau of Mines, except that smoke of a density designated as Number One shall be permitted for one four minute period in each one-half hour. Light-colored contaminants of such an opacity as to obscure an observer’s view to a degree equal to or greater than the aforesaid shall not be permitted.
      (2)   Particulate matter of dust as measured at the point of emission by any generally accepted method shall not be emitted in excess of two-tenths grains per cubic foot as corrected to a temperature of 500 degrees Fahrenheit, except for a period of four minutes in any one-half hour, at which time it may equal but not exceed six-tenths grains per cubic foot as corrected to a temperature of 500 degrees Fahrenheit.
      (3)   Due to the fact that the possibilities of air contaminants cannot reasonably be comprehensively covered in this section, there shall be applied the general rule that there shall not be discharged from any sources whatsoever such quantities of air contaminants or other material in such quality as to cause injury, detriment, nuisance, or annoyance to any considerable number of persons or to the public in general or to endanger the comfort, repose, health, or safety of any such considerable number of persons or to the public in general or to cause or have a natural tendency to cause injury or damage to business, vegetation, or property.
   F.   Odor. The emissions of odors that are generally agreed to be obnoxious to any considerable number of persons shall be deemed that strong odors of putrefaction and fermentation tend to be obnoxious and that such odors as associated with baking or the roasting of nuts and coffee shall not normally be considered obnoxious within the meaning of this chapter.
   G.   Gases. The gases sulfur dioxide and hydrogen sulfide shall not exceed five parts per million; carbon monoxide shall not exceed five parts per million. All measurements shall be taken at the zoning lot line.
   H.   Vibration. All machines, including punch presses and stamping machines, shall be so mounted as to minimize vibration and in no case shall such vibration exceed a displacement of three thousandths of an inch measured at the zoning lot line. The use of steam or broad hammers shall not be permitted in this district.
   I.   Glare and Heat. All glare, such as welding arcs and open furnaces, shall be shielded so that they shall not be visible from the zoning lot line. No heat from furnaces or processing equipment shall be sensed at the zoning lot line to the extent of raising the temperature of air or materials more than five degrees Fahrenheit.
7.   Bulk Regulations. The following requirements shall provide for light and air around permitted uses and buildings in the ML District:
 
Min. Lot Area (sq. ft.)
Min. Lot Width (feet)
Min. Front Yard (feet)
Min. Side Yard (feet)
Maximum Height
10,000
50
20
None
No restriction except as limited by gross floor area ratio and by any restrictions imposed by virtue of aircraft approach and turning zone height restrictions
Min. Rear Yard (feet)
Min. Side Yard, Street Side of Cor.
Min. Rear Yard (feet)
Max. Ground Coverage
None
10 feet
None
75 percent
 
8.   Miscellaneous Provisions.
   A.   Off-street parking and loading shall be provided for all uses established in this district.

170.56 HI - HEAVY INDUSTRIAL DISTRICT.

1.   Intent. This district is intended to provide areas for activities and uses of a heavy industrial character and is the least restrictive of any district. In the best interest of the City, certain uses in the HI District shall be subject to final City Council approval, conditional approval, or denial to insure that proper safeguards are taken. No residential uses are permitted.
2.   Permitted Uses. There may be any use, excluding residential uses and mobile homes. The following uses must be given separate Board of Adjustment approval before a zoning permit is issued:
   A.   Acid manufacture.
   B.   Cement, lime, gypsum, or plaster of paris manufacture.
   C.   Distillation of bones.
   D.   Explosive manufacture or storage.
   E.   Fat rendering.
   F.   Fertilizer manufacture.
   G.   Gas manufacture.
   H.   Garbage, offal, or dead animals, reduction or dumping.
   I.   Glue manufacture.
   J.   Petroleum, or its products, refining of.
   K.   Smelting of tin, copper, zinc, or iron ores.
   L.   Stockyards or slaughter of animals.
   M.   Junk yards. Must be surrounded by a solid fence at least six feet high located within building lines and the junk piled not higher than the fence.
   N.   Commercial livestock confinements not meeting the definition of “Agricultural.”
3.   Required Conditions.
   A.   The best practical means known for the disposal of refuse matter or water-carried waste, the abatement of obnoxious or offensive odor, dust, smoke, gas, noise, or similar nuisance shall be employed and subject to all State and federal regulations.
   B.   All principal buildings and all accessory buildings or structures, including loading and unloading facilities, shall be located at least 100 feet from any “R” District boundary, except where adjoining a railroad right-of-way, and 50 feet from any commercial boundary.
4.   Accessory Uses. Uses of land or structure customarily incidental and subordinate to a permitted use in the HI District.
   A.   Accessory buildings and uses customarily incidental to a permitted use.
   B.   Living quarters for watchmen or custodians of industrial properties.
5.   Bulk Regulations. The following requirements shall provide for light and air around permitted uses and buildings in the HI District:
 
Min. Lot Area (sq. ft.)
Min. Lot Width (feet)
Min. Front Yard (feet)
Min. Side Yard (feet)
Min. Rear Yard (feet)
Max Height
9,000
80
30
15
30
The lesser of 3 stories or 45 feet
 
6.   Off-street Parking. The following off-street parking requirements shall apply in the HI District:
   A.   All commercial uses shall provide one parking space on the lot for each 300 square feet of floor area.
   B.   All industrial uses shall provide one parking space on the lot for each two employees of maximum number employed at any one time.
7.   Off-street Loading. The following off-street loading requirements shall apply in the HI District:
   A.   All activities or uses allowed in the HI District shall be provided with adequate receiving facilities accessible by motor vehicle off any adjacent service drive or open space on the same zoning lot.
8.   Signs. The following sign regulations shall apply to the HI District:
   A.   Off-premises signs are permitted.
   B.   Off-premises signs shall comply with the setbacks of the districts they are located in. Other bulk regulations do not apply. Off-premises signs are governed by State and federal regulations along highways, where zoning exists.
   C.   No sign may be lighted in a manner which impairs the vision of the driver of any motor vehicle.
   D.   No sign may obstruct the view of any highway or railroad so as to render dangerous the use of the highway.
   E.   No sign may imitate or resemble an official traffic control sign, signal, or device.
   F.   Signs shall not encroach or extend over public right-of-way.
   G.   No sign may obscure or physically interfere with an official traffic control sign, signal, or device.
   H.   No advertisement or advertising structure shall be posted, erected, or maintained which simulates any official, directional, or warning sign erected or maintained by the State, County, Municipal, or other governmental subdivision or which incorporates or makes use of lights simulating or resembling traffic signals or control signs.
   I.   No advertisement shall be posted or maintained on rocks, fences, trees, or other perennial plants, or on poles maintained by public utilities.
   J.   Signs may be erected on municipal utility structures by written approval of the City.

170.58 M - MODIFIED RESIDENTIAL DISTRICT.

1.   Intent. This district is designed to provide for the inclusion of mobile home parks as an additional use in several districts at locations which are suitable for mobile dwellings.
2.   Permitted Uses. The following uses are permitted in the M District:
   A.   Any principal permitted use in the primary district to which the M District classification is appended when established according to the rules and conditions of the primary district.
   B.   Parks authorized by the City for the parking and occupancy of mobile dwellings.
3.   Accessory Uses. Uses of land or structure customarily incidental and subordinate to a permitted use in the M District including, but not limited to, the following:
   A.   Any permitted accessory use allowed in the primary district to which the M District classification is appended when established according to the rules and conditions of the primary district.
   B.   Those accessory uses other than those permitted by the primary district regulations, but which are or may in the future, be required for inclusion in mobile home parks by other ordinances of the City.
4.   Special Exceptions. Certain uses may be permitted in the M District subject to specific conditions and requirements intended to make them compatible with and acceptable to adjacent uses:
   A.   Any special exception use permitted in the primary district to which the M District classification is appended when established according to the rules and conditions of the primary district.
5.   Bulk Regulations. The following requirements shall provide for light and air around permitted uses and buildings in the M District:
   A.   All space limit provisions of the primary district to which the M District classification is appended shall be adhered to, except that mobile homes may be parked in compliance with minimum standards of other ordinances of the City.
6.   Procedure. The M District shall be considered as a separate and distinct zoning classification and shall be appended to a primary district in the same manner in which zoning map changes are made under the provision of the statutes of the State of Iowa and of this chapter and shall modify the regulations applying to the specific sites or zoning lots upon which the M District is designated.
7.   Miscellaneous Provisions.
   A.   Off-street parking shall be provided for all uses established in this district.
   B.   The entire mobile home park shall be treated as one zoning lot, except that when uses other than those normally included or required by ordinance within a mobile home park are established within the boundaries of a mobile home park, then a separate zoning lot shall be designated for said other uses.