What is the area of ??the Convenient Hotel with stairs and elevators?

The clear height of the upper and lower aisles of the stair platform should not be less than 2m

But if one of the following conditions is met, a safety exit can be set up: on the 18th floor and below , a tower residence with no more than 8 households on each floor, a building area of ??no more than 650m2, and a smoke-proof stairwell and fire elevator.