[CC Ch. 35 §1; Ord. No. 10-1974 Ch. 35 §1, 7-1-1974]
This Chapter, which shall be known as "The Zoning Code of the City of St. John, Missouri," may be cited as "The Zoning Code."
[CC Ch. 35 §2; Ord. No. 10-1974 Ch. 35 §2, 7-1-1974; Ord. No. 962 §1, 3-21-2011; Ord. No. 996 §2, 11-19-2012]
The Zoning Ordinance is adopted to facilitate the implementation of the 2012 Comprehensive Plan of the City of St. John, and to promote health, safety, morals, comfort, and general welfare; to secure economic and coordinated land use; and to facilitate the adequate provision of public improvements.
[CC Ch. 35 §3; Ord. No. 10-1974 Ch. 35 §3, 7-1-1974; Ord. No. 538 §1, 2-5-1996; Ord. No. 791 §1, 3-15-2004; Ord. No. 803 §§1, 3, 6-21-2004; Ord. No. 962 §2, 3-21-2011]
A. 
For the purpose of this Chapter, certain words and phrases are herein defined. Words and phrases defined herein shall be given the defined meaning. Words and phrases which are not defined shall be given their usual meanings except where the context clearly indicates a different or specific meaning.
B. 
Words used in the present tense shall include the future; the singular number includes the plural and the plural includes the singular, the word "dwelling" includes the word "residence," and the word "shall" is mandatory and not permissive.
C. 
The following words and phrases are defined:
ACCESSORY BUILDING
Any building, the use of which is incidental to the principal use of another structure on the same premises.
ACCESSORY LIVING QUARTERS
Living quarters within an accessory building located on the same lot with the main building for the sole use of persons employed on the same premises.
ACCESSORY STRUCTURE
Any structure, the use of which is incidental to the principal use of another structure on the same premises.
ACCESSORY USE
A use incidental and subordinate to the principal use of the premises.
ALLEY
A public right-of-way which affords only a secondary means of access to abutting property.
APARTMENT UNIT
A dwelling unit within a multiple-family dwelling.
AUTOMOBILE (VEHICLE) SALES AREA
An open area, other than a street or alley, used for the display, sale or rental of new or used motor vehicles and where no repair work is done except minor incidental repair of such motor vehicles to be displayed, sold or rented on the premises.
BASEMENT
A floored and walled substructure of a building, at least fifty percent (50%) below the average finished grade of the building. A "basement" shall not be counted as a story.
BLOCK
An area of land surrounded by public highways, streets, streams, railroad rights-of-way, parks or other similar areas or facilities.
BOARD OF ADJUSTMENT
See Article X of this Chapter.
BOARD, PLANNING AND ZONING
The City Planning and Zoning Board of St. John, Missouri.
BUILDABLE LOT WIDTH
The width of a lot minus the combined widths of the minimum required side yards.
BUILDING
Any structure having a roof supported by columns or walls for the shelter, support or enclosure of persons, animals, chattels or property of any kind and, when separated by dividing walls without openings, each such portion of such building so separated shall be deemed a separate building.
BUILDING, HEIGHT OF
The vertical distance measured from the finished ground elevation at the perimeter of such building to the highest point of the roof parapet of a flat roof, or to its roof surface if there is no parapet; to the deck line of a mansard roof; and to the middle point of the vertical distance between eaves and ridges of gable, hip, and gambrel roofs.
BUILDING LINE
A line drawn parallel to a lot line at a distance therefrom equal to the depth of the corresponding required yard.
CITY
The City of St. John, Missouri.
CITY PLANNING AND ZONING BOARD
The City Planning and Zoning Board of St. John, Missouri, as defined in Article VI, Section 6.02 of the City Charter.
CLINIC
The group practice of medicine or dentistry for humans including assistants and laboratories, but not including in-patient care or operating rooms for major surgery.
CLUB
A building or a portion of a building intended to be used as a center of informal association for a selective membership not open to the general public.
COMMUNITY CENTER
A facility maintained by a public agency or by a not-for-profit community or neighborhood association primarily for social, recreational, or educational needs of the community or neighborhood.
COMPREHENSIVE PLAN
The Comprehensive Plan of the City of St. John as defined in Article VI, Section 6.03 of the City Charter.
DENSE PLANTING STRIP
A continuous area of land set aside along the perimeter of a parcel or lot that is established to protect an abutting land use from the land use on the subject parcel. A dense planting strip consists of a landscaped surface, not less than the full width or full length of the parcel or lot and contains dense foliage, shrubbery, evergreens or other such plant material not less than four (4) feet in height and planted in such a way as to limit visibility between adjoining parcels or lots. Such dense planting strip shall be permanently maintained.
DEVELOPER
That person, firm or corporation by whom a tract will be subdivided and/or improved pursuant to the requirements of this Chapter.
DEVELOPMENT
The act of changing as well as the state of a tract of land after its function has been purposefully changed by man, including, but not limited to, structures on the land and alterations to the land.
DISTRICT
A part or parts of the City of St. John for which the Zoning Code establishes regulations governing the development and use of land therein.
DISTRICT CLASSIFICATIONS
The "FP" Flood Plain, the "PS" Park and Scenic, the "R" Residence, the "C" Commercial, the "I" Industrial, and the "S" Special districts of St. John, Missouri.
DORMITORY
A building, usually associated with an educational or religious institution, with many rooms providing sleeping and living accommodations for a number of usually unrelated persons.
DWELLING
Any building, or portion thereof, used exclusively for human habitation; except hotels, motels, dormitories, or house-trailers.
DWELLING UNIT (RESIDENTIAL UNIT)
A room or group of rooms located within a dwelling and forming a habitable residence for one (1) family.
DWELLING, SINGLE-FAMILY
A detached building designed for or occupied exclusively by one (1) family and shall include, but not be limited to, any home in which eight (8) or fewer unrelated mentally or physically handicapped persons reside, and may include two (2) additional persons acting as houseparents or guardians who need not be related to each other or to any of the mentally or physically handicapped persons residing in the home.
DWELLING, TWO-FAMILY (DUPLEX)
A detached building designed for or occupied exclusively by two (2) families living independently of each other.
DWELLING, THREE-FAMILY (TRIPLEX)
A detached building designed for or occupied exclusively by three (3) families living independently of each other.
DWELLING, MULTIPLE-FAMILY
A building, or portion thereof, used or designed as a residence for four (4) or more families living independently of each other.
EASEMENT
A grant by a property owner to the public, to a corporation, utility or to a person for the use of land for a specific purpose.
EASEMENT, ROAD MAINTENANCE AND IMPROVEMENT
A grant by a property owner to the City, County, or State for the purpose of road maintenance, improvement and widening.
EASEMENT, UTILITY
A grant by a property owner to a public utility company for the purpose of installation, improvement and maintenance of public utilities.
ENGINEER
A professional engineer registered in the State of Missouri.
FAMILY
An individual, or two (2) or more persons related by blood or marriage, or a group of persons who need not be related by blood or marriage living together and subsisting in common as a single non-profit housekeeping unit utilizing only one (1) kitchen and shall include, but not be limited to, any private residence licensed by the Division of Family Services or Department of Mental Health to provide foster care to one (1) or more but less than seven (7) children who are unrelated to either foster parent by blood, marriage or adoption.
[Ord. No. 1148, 6-4-2018]
FARM
A parcel of land used for growing or raising of agricultural products including related structures thereof.
FENCE
A structure, exposed on both sides erected from the ground level up for the purpose of enclosing a piece of land or to separate two (2) contiguous pieces of land.
FENCE - HAZARDOUS
Any single strand wire having sharp points or protrusions which can cause serious injury. Including, but not limited to, barbed wire, razor wire, etc.
FLOOD PLAIN
A geographic area susceptible to periodic inundation from overflow of natural waterways and determined as to its extent in St. John by the 1964 Flood Elevation Study made by the St. Louis County Planning Commission.
FOSTER HOME FOR HANDICAPPED CHILDREN
An institution providing sleeping and living accommodations for the full-time care, training, recreation, and convalescent needs of three (3) or more physically or mentally handicapped minors.
FRONTAGE
That edge of a lot or series of contiguous lots bordering a street right-of-way.
FUEL CENTER
An accessory structure or accessory building used for dispensing, or sale at retail, of vehicle fuel that is an accessory use to another permitted land use and development with a primary structure larger than one hundred thousand (100,000) square feet.
[Ord. No. 1237, 10-3-2022]
GARAGE, PARKING
A building, or portion thereof, designed or used exclusively for the storage of motor-driven or self-propelled vehicles; and at which gasoline, motor fuels, and oils are not sold and motor-driven or self-propelled vehicles are not serviced, equipped, repaired, hired or sold.
GARAGE, PRIVATE
An accessory building with capacity for not more than four (4) motor vehicles for storage only, with no provision for servicing such vehicles for profit.
GARAGE, SERVICE
Any building or premises, except those described as a private garage or parking garage, used for the storage or care of self-propelled vehicles, or where any such vehicles are equipped for operation, serviced, repaired or kept for remuneration, hire or sale.
GARDEN APARTMENT
An apartment unit in a multiple-family dwelling with a maximum of three (3) stories, which usually integrates indoors and outdoors by using large windows and by opening apartments onto private patios, terraces or balconies.
GOLF COURSE
An area or course for playing golf which consists of at least nine (9) holes, except miniature golf, within which the playing area is not artificially illuminated.
GOLF, MINIATURE
A commercial recreation facility resembling golf but containing short "holes," the majority of which are under three hundred (300) feet in length.
HOME OCCUPATION
A domestic activity carried on by no more than two (2) members of a family residing on the premises and providing that there are no signs or any display that will indicate from the exterior of the building that it is being utilized, in whole or in part, for any purpose other than that of a dwelling; providing, also, that there is no stock in trade or commodity sold or stored upon the premises, no person is employed other than a member of the family residing on the premises, and no mechanical equipment is used except such as is customary for purely domestic or household purposes. However, a "home occupation" shall not be interpreted to include barber shops, beauty parlors, tourist homes, and restaurants.
HOSPITAL
An institution providing medical and surgical care for both in and out patients and including medical service, training, and research facilities.
HOTEL
A building in which lodging, with or without meals, is provided and offered to the public for compensation and which is open to transient guests; provided however, that there are no provisions for cooking in any individual room.
HOUSE-TRAILER
A self-contained mobile structure, non-self-propelled, intended to be used for dwelling purposes and which has been, or reasonably may be, equipped with wheels or other devices for transporting said structure.
HOUSE-TRAILER PARK
An area designed or intended to be used as a site for occupied house-trailers.
JUNK YARD
A parcel of land on which waste material and/or inoperative vehicles and other machinery are collected, stored, salvaged, or sold.
KENNEL
The use of land or buildings for the purpose of selling, breeding, boarding, or training dogs or cats or both; or the keeping of three (3) or more dogs over six (6) months of age; or the keeping of three (3) or more cats over six (6) months of age; or the keeping of more than four (4) dogs and cats. The word "selling" as herein used shall not be construed to include the sale of animals six (6) months of age or younger which are the natural increase of animals kept by persons not operating a kennel as herein defined; nor shall selling be determined to include isolated sales of animals over six (6) months old by persons not operating a kennel as herein defined.
LOADING SPACE
A paved space within the main building or on the same lot for the standing, loading or unloading of trucks.
LOT
A platted parcel of land intended to be separately owned. developed, or otherwise used as a unit.
LOT, AREA
The total horizontal area within the boundaries of a lot.
LOT, CORNER
A lot abutting upon two (2) or more streets at their intersection.
LOT, DEPTH
The average horizontal distance from the front lot line to the rear lot line.
LOT, DOUBLE FRONTAGE (THROUGH LOT)
A lot having frontage on two (2) non-intersecting streets as distinguished from a corner lot.
LOT, INTERIOR
A lot other than a corner lot.
LOT LINES (PROPERTY LINES)
The lines bounding a lot as defined herein.
LOT LINE, FRONT
In the case of an interior lot, that line which separates said lot from the street right-of-way. In the case of a corner lot or double frontage lot, those lines separating said lot from the street rights-of-way.
LOT LINE, REAR
In the case of an interior lot, that lot line that is most distant from, and is parallel or nearly parallel to the front lot line. In the case of a corner lot, that lot line which is parallel or nearly parallel to the shortest front lot line. There is no rear lot line on a double frontage lot.
LOT LINE, SIDE
Any lot line which is not a front lot line or a rear lot line.
LOT OF RECORD
A lot which is part of a subdivision, the plat of which has been recorded in the Office of the Recorder of Deeds of St. Louis County; or a parcel of land which was legally approved and the deed recorded in the Office of the Recorder of Deeds of St. Louis County prior to the adoption of this Chapter. A Deed of Trust is not to be considered a deed by the terms of this definition.
LOT WIDTH
The horizontal distance between the side lot lines measured at the building line.
MOTEL (MOTOR HOTEL)
A building or group of buildings containing individual sleeping or living units for the temporary residence of transient motorists or travelers, and with parking facilities conveniently located to each such unit.
NON-CONFORMING LAND USE OR STRUCTURE
A land use or structure which existed lawfully on the date (July 1, 1974) this Zoning Code or any amendment thereto became effective and which fails to conform to one or more of the applicable regulations in the Zoning Code or such amendment thereto, except minimum lot area, yard, and setback requirements.
NURSERY, DAY
A building used for the supervision and care of preschool children during daylight hours; provided however, that no residence shall be used by more than six (6) such children, other than those of the operator.
NURSERY SCHOOL
A pre-kindergarten school for children primarily between the ages of three (3) and five (5).
NURSING HOME
A building intended for use as a medical care facility for persons who need nursing care and medical service but do not require intensive hospital care.
OFFICE
A building, or portion of a building, wherein services are performed involving predominantly administrative, professional or clerical operations.
OPEN SPACE, PUBLIC
Land which may be dedicated or reserved for acquisition for general use by the public, including parks, recreational areas, school sites, community or public building sites, and other public lands.
OPEN STORAGE
Storage of material or goods on the ground outside of a building.
OVERLAY ZONING DISTRICT
A zoning district which can be utilized as an alternate zoning district for a specified area within the City of St. John, if certain general conditions are met. Sections 400.160 and 400.170 of this Chapter describe the two (2) "Overlay Zoning Districts" within the City.
PARCEL (TRACT) OF LAND
A separately designated area of land delineated by identifiable legally recorded boundary lines.
PARK
An area open to the general public and reserved for recreational, educational, or scenic purposes.
PARKING AREA, PUBLIC
An open area, other than a street or alley, used for the temporary parking (one (1) day or less) of self-propelled vehicles, and which is available for public use whether free, for compensation, or as an accommodation for clients or customers.
PARKING AREA, SEMI-PUBLIC
An open area, other than a street or alley, used for temporary parking (one (1) day or less) of self-propelled vehicles as an accessory use to such land uses as semi-public institutions, schools, churches, hospitals, and non-commercial clubs.
PARKING SPACE
A durable, dust-proof, surfaced, properly graded for drainage, usable and accessible space; enclosed in a main building, in an accessory building, or unenclosed; and which is not less than eight (8) feet wide by fifteen (15) feet long.
[Ord. No. 1171, 6-3-2019]
PEDESTRIAN WAY
An easement or right-of-way dedicated to public use to facilitate pedestrian access to adjacent streets and properties.
PERMITTED BY RIGHT
Uses which are listed in each zoning district under the title "Permitted Land Uses and Developments."
PERSONAL SERVICES
Those activities which provide frequently or recurrently needed services on site and which involve the care of a person or his personal goods or apparel. Typical uses include beauty or barber shops, electrolysis studios, nail salons, shoe shining and/or repair operations, tailors and neighborhood laundry and dry cleaning operations.
PLANNED DEVELOPMENT
A development which is approved through a zoning procedure designed to permit flexibility in building types and relationships between buildings. In a planned zoning district, a tract of land may be developed for any use permitted in that district, provided that approval is obtained by securing a Planned Development Permit from the City Council in compliance with the procedure delineated in Section 400.320 of this Chapter. Height, lot area, lot dimensions, yard, off-street parking, off-street loading, and sign requirements shall be limited by the conditions in the ordinance authorizing the establishment of the particular Planned Development.
PLANNING AND ZONING BOARD
The City Planning and Zoning Board of St. John, Missouri.
PLANT NURSERY
A farm, garden, or other cultivated land, together with accessory structures, designed and intended to be used only for the cultivation and sale of live vegetation.
PROPERTY LINE
The legally recorded boundary of a lot, tract, or other parcel of land.
PUBLIC UTILITY FACILITY
A public utility facility serving a wide area, such as a high voltage transmission tower or a power generation plant.
PUBLIC UTILITY FACILITY, LOCAL
A public utility facility serving a local area only, such as an electric substation, a water or gas pumping or regulating station, or a telephone switching center.
PUBLIC WORKS, DIRECTOR
An individual person or a firm, appointed by the City Manager, whose function is to review all zoning petitions, and development plans prior to their review by the Planning and Zoning Board, in order to ensure that they are complete; to inspect developments to insure that they are constructed according to the approved plans; to issue building permits; and generally to perform all functions assigned to him by reference in this Chapter.
RECREATIONAL VEHICLE
Any vehicle which relates to, or is used primarily for, recreational activities.
RESIDENCE
Any building, or portion thereof, which is designed or used exclusively for residential purposes; except hotels, motels, or dormitories.
RESTAURANT
An establishment where the sale of foods prepared for consumption on the premises represents the major source of income for the establishment.
RESTAURANT, DRIVE-IN
An establishment where food and/or beverage is sold to the consumer, where motor vehicle parking space is provided, and where provisions are made to permit such food and/or beverage to be consumed in the motor vehicle parked upon the premises or anywhere on the premises outside the main building.
RETREAT
A building or group of buildings with designated open areas utilized and maintained for educational and religious conclaves, seminars, and similar activities by particular educational, religious, fraternal, or other groups.
SEMI-FINISHED MATERIAL
Material which has gone through one (1) or more stages of processing.
SERVICE STATION
Any structure or premises used for dispensing, or sale at retail, of automotive vehicle fuels or lubricants, and for the lubrication of automobiles and replacement or installation of minor parts and accessories; excluding, however, major repair work, such as motor replacement, body and fender repair, spray painting, and the storage of junk or vehicles for sale.
SETBACK
The average horizontal distance between the building line and the lot line.
SIGN
A name, identification, description, display, or illustration which is affixed to, or points out, a building, structure, or tract of land, and which directs attention to an object, product, place, person, service, activity, institution, organization or business.
1. 
Attached sign: A sign which is in any manner affixed to any exterior wall of a building and which projects not more than eighteen (18) inches from the building wall and which does not extend more than five (5) feet above the highest point of the roof surface of a flat roof; the deck line of a mansard roof; or the eave line of a gable, hip or gambrel roof.
2. 
Business sign: A sign which directs attention to a business or profession conducted or to a commodity, service or entertainment sold or offered upon the premises where such sign is located.
3. 
Directional sign: A sign identifying entrances, exits, aisles, ramps, and similar traffic-related information.
4. 
Flashing sign: An illuminated sign on which an artificial or reflected light is not continuously constant in intensity and/or color.
5. 
Free standing sign: A sign not attached to or painted on a building, but which is mounted on a separate structure which is affixed to the ground. A sign attached to a flat surface such as a fence or wall which is not part of a building shall be considered a free standing sign.
6. 
Height of free standing sign: The vertical distance measured from either the ground elevation of the structure supporting the sign or the upper surface of the nearest curb or edge of a street, whichever is lower, to the highest point of a sign.
7. 
Illuminated sign: Any sign designed to internally give forth artificial light or designed to reflect light from one or more exterior sources of artificial light erected for the sole purpose of illuminating the sign.
8. 
Indirectly illuminated sign: A sign which does not produce artificial light from within itself but which is illuminated by spotlights, floodlights, or other artificial light source(s) not a part of the sign itself.
9. 
Information sign: A sign which identifies a residence, a non-commercial activity, including historic markers, or a sign conveying cautionary and similar information.
10. 
Internally illuminated sign: A sign so designed that its source of artificial light is contained within itself and said source is not directly visible when in normal operation.
11. 
Mechanical sign: A sign that contains moving parts; creates the effect of illusion of having any moving parts; or has flashing or intermittent lighting.
12. 
Name plate: A non-business sign which states only the name or address or both of the occupant of the lot where the sign is located.
13. 
Off-premise sign: A sign which contains a message unrelated to a premises or profession or to a commodity, service or entertainment, sold or offered upon the premises where such sign is located.
14. 
Projecting sign: A sign which is attached to and whose front edge projects more than eighteen (18) inches from the face of a wall of a building.
15. 
Sign, area (outline area): The area of a sign shall include the space to be used for advertising purposes, including the spaces between open-type letters and figures, including the background structure, or other decoration or addition which is an integral part of the sign. The perimeter shall not include any structural or framing elements lying outside the perimeter and not an integral part of the sign.
16. 
Temporary business sign: A sign which gives information concerning a product, service, or activity offered, conducted or sold on the premises upon which the sign is erected and which is not displayed for more than seven (7) consecutive days.
17. 
Temporary sign: A sign which is intended to promote community or civic projects, construction projects, or other special events and intended for non-permanent use whose size and duration is defined in applicable sign regulations set forth herein.
18. 
Time and temperature sign: A sign in a commercial district used solely to convey a message stating the time of day and the temperature. Such sign shall not be considered a mechanical sign or a flashing sign.
19. 
Warning sign: An information sign which is intended to give notice of danger or possible harm.
SPECIALIZED PRIVATE SCHOOL
An institution emphasizing specialized and individual instruction for students at the grade school, junior, or senior high school level whose instructional needs are not specifically being met by public school districts.
STADIUM
A structure built about a central open space or arena with tiers of seats for spectators.
STORAGE WAREHOUSE
A completely enclosed structure available for lease or rent for the purpose of the short or long term general storage of household goods, vehicles, or other personal property.
STORAGE YARD
An area from which no retail sales are undertaken and which is used for the outdoor storage of equipment, goods and material.
STORY
That portion of a building, other than a basement, included between the surface of any floor and the surface of the floor next above it, or if there be no floor above it, then the space between the surface of the floor and the ceiling above it.
STORY, HALF
A story under a gable, hip or gambrel roof, with exterior walls on at least two (2) opposite sides that are not more than three (3) feet above the floor level of such story.
STREET
A general term denoting a public or private way which affords the principal means of access to abutting property. The term includes all facilities which normally occur within the right-of-way. It shall also include such other designations as highway, thoroughfare, parkway, throughway, road, pike, avenue, boulevard, lane, place, and court, but shall not include an alley or a pedestrian way.
STREET, ARTERIAL
A multi-lane facility designed for movement of a relatively large volume of traffic. Arterials provide connections between local and collector streets and freeways.
STREET, COLLECTOR
A street located within a neighborhood or other integrated-use area which collects from and distributes traffic to local streets, and connects arterial streets.
STREET, LOCAL
A street, used primarily to provide direct access to abutting properties.
STREET, FRONTAGE OR SERVICE
A minor street generally parallel to and adjacent to arterial streets and highways which provides access to abutting properties and protection from through traffic.
STRUCTURE
Anything constructed or erected, the use of which requires permanent location on the ground, or which is attached to something having a permanent location on the ground. This definition does not apply to existing parking lots.
STRUCTURE, HEIGHT OF
The vertical distance measured from the finished ground elevation at the perimeter of such structure to its highest point.
STRUCTURAL ALTERATION
Any change in the supporting members of a building, such as bearing walls, columns, beams or girders, or any substantial change in the roof or in the exterior walls.
SUBSTANTIAL CONSTRUCTION, DEVELOPMENT, OR WORK
1. 
In a project involving structures, the completion of excavation for footings and foundations.
2. 
In a project involving no structure or insignificant structures, the completion of grading.
TOWNHOUSE
A single-family attached dwelling unit, usually in rows of houses with common side walls at least partially, and usually with at least one (1) walk-up floor above ground floor.
USE
As utilized herein, "use" is any functional, social, economic or technological activity which is imposed or applied to land or to structures on the land.
USED OR NEW AUTOMOBILE, TRUCK, OR OTHER MOTOR VEHICLE DEALER
A dealer in used or new automobiles, trucks, motor vehicles or recreation vehicles when purchased or sold as a unit and any enfranchised new car dealer operating a used car or truck department.
VARIANCE
A modification or variation of the provisions of this Chapter as applied to a specific piece of property and approved by the Board of Adjustment, except that modification in the allowable uses within a district shall not be considered a variance.
VETERINARY CLINIC
A facility for the practice of veterinary medicine.
WAREHOUSE
A building used for the storage of goods, wares, or merchandise that will be processed, sold, or otherwise disposed of off the site of the premises.
YARD
An open space on the same lot with a building, unoccupied and unobstructed by any portion of a structure from the ground upward, except as otherwise provided in this Chapter. Unless otherwise stated in this Chapter, the width of a side yard, the depth of a front yard, or the depth of a rear yard, shall be the minimum horizontal distance between the lot line and the nearest portion of the main building.
YARD, FRONT
A required yard extending across the full width of the front of the lot between the side lot lines and measured between:
1. 
The front line of the lot and the nearest point of the building; or
2. 
The front line of the lot and the nearest point of any steps, unenclosed balcony, unenclosed porch or terrace.
YARD, REAR
A required yard extending across the full width of the lot at the opposite end of the lot from the front yard, and measured between the rear line of the lot and the rear of the main building or any projections thereof, other than steps, unenclosed porch or terrace. On corner lots the "rear yard" shall be considered as parallel to the street upon which the lot has its least dimension.
YARD, SIDE
A required yard between the nearest point of the main building and the side lines of the lot and extending from the front lot line to the rear lot line.