14B-5-503  General building height and area limitations.
The provisions of Section 503 of IBC are adopted by reference with the following modifications:
1.   Revise Section 503.1 to read:
503.1 General.
Unless otherwise specifically modified in Chapter 4 and this chapter, building height, number of stories above grade plane and building area shall not exceed the limits specified in Sections 504 and 506 based on the type of construction as determined by Section 602 and the occupancies as determined by Section 302 except as modified hereafter. Building height, number of stories above grade plane and building area provisions shall be applied independently. For the purposes of determining building area limitations, building height limitations and type of construction, each portion of a structure separated by one or more fire walls complying with Section 706 shall be considered to be a separate building.”
2.   Revise Section 503.1.1 to read:
503.1.1 Special industrial occupancies.
Single-story buildings and structures of Type I or II construction used exclusively for the production and distribution of electricity, gas or steam or for low-hazard industrial processes that require large areas and unusual building heights to accommodate craneways or special machinery and equipment shall be exempt from the building height and building area limitations specified in Sections 504 and 506.”
3.   Revise Section 503.1.2 to read:
503.1.2 Buildings on same lot.
Two or more buildings on the same lot shall be regulated as separate buildings.
Exception: Two or more buildings on the same lot of record may be considered as portions of one building where the building height and number of stories above grade plane of each building and the aggregate building area of the buildings are within the limitations specified in Sections 504 and 506. The provisions of this code applicable to the aggregate building shall be applicable to each building.
4.   Delete Section 503.1.3.
5.   Revise Section 503.1.4 and its subsections to read:
503.1.4 Occupiable rooftops.
A roof level or portion thereof shall be permitted to be used as an occupiable rooftop provided the occupancy of the roof is an occupancy that is permitted by Table 504.4 for the story immediately below the roof. The area of the occupiable rooftop shall not be included in the building area as regulated by Section 506.
Exception: The occupancy located on an occupiable rooftop shall not be limited to the occupancies allowed on the story immediately below the occupiable rooftop where the building is equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1 or 903.3.1.2 and occupant notification in accordance with Section 907.5 is provided in the area of the occupiable rooftop.”
(Amend Coun. J. 2-19-20, p. 14473, Art. II, § 15)