Firewall in between multifamily units

[Katherine Roberts]

I’m sure this is specific to my area, but we just got inspections done for a property we’re about to close on. The house was converted from single family to a duplex. They stripped it down to the studs and rebuilt it, but they did not divide the attic space between the units? Someone could literally crawl through the roof into the next door unit. Is this normal for multifamily? Other than the security aspect, it’s also a fire hazard. Should we ask for them to build one in? Any solutions you can think of? All I can think of is to lock both attics, but there’s still the fire danger. Does anyone know where to find the building codes pertinent to this for Tulsa?