According to the Life Safety Code, a dead-end corridor in a new, unsprinklered business occupancy building may be acceptable if the length of the corridor is less than:

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In the Life Safety Code, dead-end corridors are limited because a longer dead end increases the risk that occupants won’t be able to reach an exit before fire and smoke block the path. For a new building in a business occupancy that is not protected by automatic sprinklers, the maximum allowed length of a dead-end corridor is 20 feet. This keeps egress time short and reduces the chance of occupants becoming trapped. If sprinklers were provided, the limit would be higher, but in an unsprinklered scenario the 20-foot rule is the controlling standard. The other lengths exceed this unsprinklered limit, so they aren’t acceptable.