best way to evaluate 6 unit (2 triplex next to each other)?

[Carl Fordyce]

i currently own a 4-plex I'm considering a 6 unit but I'm not sure how i should run my numbers on it because of how its set up.  its technically 2 triplex buildings right next to each other but their on one deed.   in this situation is it  best to run the numbers for all six unit at a time or to separate the two buildings and evaluate the numbers for each building separately at a time.