I have a 1979 UBC. Draftstopping under that code is different than today. Under the old code attics just had to be divided to areas not greater than 1000 square feet, but unlike today's code, there is no mention of multiple units being under the same 1000 sq feet portion.
I'd be more worried about all these attic accesses in general. In a multifamily building you really don't have any reason to give each unit an access, especially if its to the same draftstopped area as another. I'd recommend the minimum amount of accesses and then be sure they are rated the same as the (likely rated) ceiling membrane. Self closing devices. Etc. Attic accesses are notorious locations for fire breach. Keep the tenants out of there.
I'd be more worried about all these attic accesses in general. In a multifamily building you really don't have any reason to give each unit an access, especially if its to the same draftstopped area as another. I'd recommend the minimum amount of accesses and then be sure they are rated the same as the (likely rated) ceiling membrane. Self closing devices. Etc. Attic accesses are notorious locations for fire breach. Keep the tenants out of there.