SSR and OKW both have the 2-br dedicated and 2-br lock-off units.
At SSR, I believe it is 24 2-br lock-off and 20 2-br dedicated per building. (And 2 GV's).
With the 2-br lock-off units, you have a better chance of being on one of the ends of the building with 12 of the 24 on one end or the other. With the 2-br dedicated, you have a better chance of not being on the end, with only 4 of the 20 being on the end.