First time posting, but I'm working on a similar project as nealderidder, where I'm trying to get an open stairway under the provisions of 1019.3 Condition 4. However, one of those four floors is a basement (and one of them is a roof). Can you point me to the code section that precludes the basement connection?
If the basement can't be connected through the same vertical opening, can the stair to the basement just be relocated elsewhere in the building? If so, how far away would it need to be relocated in order to not constitute a vertical opening?