Add Section B-1010.1.9.4.1 as follows:
B-1010.1.9.4.1 Locks and latches. Locks and latches shall be permitted to prevent operation of doors where an elevator lobby is separated from the remainder of the floor by partitions and doors; and where the elevator lobby does not provide access to the required exits, the doors in the lobby partitions are permitted to be locked from the lobby side provided the doors conform to Section 1010.1.9.8 or Section 1010.1.9.9 with or without delayed locking arrangement.
Add Section B-1010.1.9.12.1 as follows:
B-1010.1.9.12.1 Stairway side door locking arrangement. Interior stairway means of egress doors may be openable from only the egress side in stairways serving more than four stories, where the floors served by the stairs are not located more than 75 feet (22 860 mm) above the lowest level of fire department vehicle access nor more than 30 feet (9144 mm) below the lowest level of exit discharge. Such doors are permitted to be locked from the side opposite the egress side, provided they unlock upon activation of the building fire alarm system or power failure to the locking device, and the doors are always openable from the egress side.