Adjacent walls that are structurally independant

[Patrick Torborg]

I am remodeling two warehouses that have adjacent walls. I am trying to do the existing condition drawings. The drawing I have going thinks that it is one building, but structurally speaking they are two separate buildings. I need to put a flat roof on one and shed roof on the other. I know how to do the roof for each, but am getting some strange results. The automatic roof function replaces the shed roof I did manually, and gives both what looks like no roof. I either need a tip on making flat roof manually, or making two adjacent building independant of each other. There is one existing door that connects the two buildings.