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two-hour fire-resistive construction. All openings in such separation shall be protected by a fire assembly
having a one and one-half-hour fire-resistive rating.
(3) A "Three-Hour Fire-Resistive Occupancy Separation" shall be of not less than three-hour fire-resistive
construction. All openings in walls forming such separation shall be protected by a fire assembly having a
three-hour fire-resistive rating. The total width of all openings in any three-hour fire-resistive occupancy
separation wall in any one-story shall not exceed 25 per cent of the length of the wall in that story and no
single opening shall have an area greater than 10.00 square meters (107.1 square feet). All openings in
floors forming a "Three-Hour Fire-Resistive Occupancy Separation" shall be protected by vertical
enclosures extending above and below such openings. The walls of such vertical enclosures shall be of
assembly having one and one-half-hour fire-resistive rating.
(4) A "Four-Hour Fire-Resistive Occupancy Separation" shall have no openings therein and shall be of not
less than four-hour fire-resistive construction.
(d) Fire Ratings for Occupancy Separation. Occupancy separations shall be provided between various
groups, subgroupings, or divisions of occupancies. The Secretary shall promulgate rules and regulations
for appropriate occupancy separations in buildings of mixed occupancy: Provided, That where any
occupancy separation is required, the minimum shall be a "One-Hour Fire-Resistive Occupancy
Separation"; and where the occupancy separation is horizontal, structural members supporting the
separation shall be protected by equivalent fire-resistive construction.
SECTION 3.01.04: Location on Property
(a) General. Buildings shall adjoin or have access to a public space, yard, or street on not less than one
side. Required yards shall be permanently maintained. For the purpose of this Section, the center line of
an adjoining street or alley shall be considered an adjacent property line. Eaves over required windows
shall be not less than 75 centimeters (30 inches) from the side and rear and rear property lines.
(b) Fire Resistance of Walls. Exterior walls shall have fire resistance and opening protection in
accordance with requirements set by the Secretary. Projections beyond the exterior wall shall not extend
beyond a point one-third the distance to the property line from an exterior wall; or a point one-third the
distance from an assumed vertical plane located where fire-resistive protection of openings is first
required due to location on property, whichever is the least restrictive. Distance shall be measured at right
angles from the property line. When openings in exterior walls are required to be protected due to
distance from property line, the sum of the area of such openings shall not exceed 50 per cent of the total
area of the wall in each story.
(c) Buildings on Same Property and Buildings Containing Courts. For the purpose of determining the
required wall and opening protection, buildings on the same property and court walls shall be assumed
to have a property line between them. When a new building is to be erected on the same property with an
existing building, the assumed property line from the existing building shall be the distance to the property
line for each occupancy as set forth by the Secretary: Provided, That two or more buildings on the same
property may be considered as portions of one building of the aggregate area of such buildings is within
the limits of allowable floor areas for a single building; and that when the buildings so considered house
different occupancies or are of different types of construction, the area shall be that allowed for the most
restricted occupancy or construction.
SECTION 3.01.05: Allowable Floor Areas
(a) Areas of One-Story Buildings and Building Over One Story. Allowable floor areas for one-story
buildings and buildings over one story shall not exceed the limits determined in accordance with
occupancy groups and types of construction.
(b) Area Separation Walls. Each portion of a building separated by one or more area separation walls
may be considered a separate building provided the area separation wall meet the requirements of this
SECTION 3.01.06: Allowable Area Increases
(a) The floor area hereinabove provided may be increased in certain specific instances and under
appropriate conditions, based on the existence of public space, streets, or yards extending along the
adjoining two or more sides of the building or structure.
SECTION 3.01.07: Maximum Height of Buildings and Increases
(a) The maximum height and number of stories of every building shall be dependent upon the character of
the occupancy and the type of construction, and shall not exceed the limits determined by population
density, building bulk, widths of streets, and car parking requirements. The height shall be measured
from the highest adjoining sidewalk or ground surface, provided that the height measured from the lowest
adjoining surface shall not exceed such maximum height by more than 3.00 meters (10 feet): Except, That
towers, spires, and steeples, erected as a part of a building and not used for habitation or storage, are
limited as to height only by structural design if completely of incombustible materials, or may extend not to
exceed 6.00 meters (19 feet, 8 inches) above the height limits for each occupancy group if of combustible
SECTION 3.01.08: Maximum Requirements for Group A Dwellings: One Two Stories
(a) Dwelling Location and Lot Occupancy. The dwelling shall occupy not more than