I found this yesterday. The back porch was remodeled and closed in. Where the new brick met the old it was separated pretty bad. The current owner, about 80 years old, said that when the contractor was done it split and air was drafting pretty badly into the closed in area. So she caulked it herself. No structural issues were observed anywhere so I don’t have reason to think it’s structural to that extent. Any ideas on how to write this up? Second pic is from the inside.