IBC Section 403.3.1

IBC 909.11 / IBC 403.4.7

IBC Section 909.11 requires smoke control systems to be connected to both normal and emergency power. Smoke damper actuators that fail during a power outage cannot reposition, rendering the smoke control system non-functional. All smoke control components, including damper actuators, must be on emergency power per IBC 403.4.7.

IBC Section 3006

This passes code with conditions. IBC Section 3006.2 requires enclosed elevator lobbies or an approved alternative at each floor in high-rise buildings to prevent smoke from entering the hoistway. The lobby does not necessarily require its own pressurization system if the building's smoke control system (per IBC 909) prevents smoke from migrating through the lobby to the hoistway. Smoke detectors for Phase I recall are separately required per NFPA 72. Note that general elevator hoistway venting is no longer a code requirement — old Section 3004 (Hoistway Venting) was removed/reserved in the 2015 IBC and later editions because lobby and hoistway-opening protection (Section 3006) supersede it, so venting at the top is optional, not mandated. The building's approach of using the floor smoke control system in lieu of individual lobby pressurization is permitted if the smoke control engineer of record demonstrates adequate protection.

IBC Section 403.1 / IBC 905.3.1

This fails code. IBC Section 403.1 defines a high-rise building as having an occupied floor located more than 75 feet above the lowest level of fire department vehicle access. At 72 feet, this building is NOT classified as a high-rise under IBC. However, some jurisdictions amend the threshold to 55 or 60 feet. The question states 72 feet — technically under the IBC threshold of 75 feet, but local amendments may apply. More critically, IBC Section 905.3.1 independently requires a Class III standpipe system where the floor level of the highest story is located more than 30 feet above the lowest level of fire department vehicle access. So while the building may avoid IBC 403 high-rise requirements, it still requires standpipes per IBC 905.3.1 (NFPA 14 governs how that standpipe is installed and sized, not where it is mandated). The owner's blanket statement that none of these systems are required is incorrect.

IBC Section 403.4.6

This passes code. IBC Section 403.4.6 requires a fire command center in all high-rise buildings. It must be located on the first story of the building, with direct access from the exterior. The required features include: fire alarm system interface, voice/alarm communication, fire department telephone, elevator floor indicators and controls, emergency generator status, smoke control system interface, sprinkler valve and waterflow indicators, standpipe status, and stairwell door unlocking controls. The 1-hour fire rating, emergency lighting, and location on the ground floor with exterior access all meet the code requirements. This room serves as the central coordination point for fire department operations in the building.

IBC/IFC Section 915 / NFPA 72

Carbon monoxide detection requirements live in IBC/IFC Section 915 (with installation and design per NFPA 72 — the former standalone CO standard NFPA 720 was withdrawn after 2015 and merged into NFPA 72 starting with the 2019 edition). Where CO detection is provided for fuel-burning equipment, mounting at breathing height (5 feet) is acceptable for CO since it is roughly the same density as air and mixes throughout the space. Hardwired with battery backup and connection to the building alarm meet or exceed those requirements. Note: specific commercial mechanical-room mandates are AHJ/jurisdiction-dependent.