4 Family to 2 Family Hallway

Hello All- I want to convert my 4 family building to a 2 family building. 3 units on the 2nd and 3rd floors will be combined to form one apartment, and the parlor and garden floors will constitute another unit. Is it legal to use the shared stairway to access the different rooms of the upper level apartment? The parlor/garden apartment has access via the garden level exterior entrance and on the parlor floor via the shared stairway/hallway foyer.

By Fjukio |