We are designing an addition for two residential units on a 120' deep lot, R3 occupancy, 2 stories (ground level is commercial space) with only one staircase. We exceed the 125' exit access travel distance limit, but we would like the make the case that the 125' exit access travel distance should be measured to the encloses, fire rated staircase. Anyone has any experience or knows of a code exception? Alternatively, we would like to propose/design the staircase to become an area of refuge. Would that be allowed? Thank you.