[colatkinson]

This is a super common setup in my part of NYC (minus the elevator). It seems to work fairly well, especially since it makes it viable to have lots of buildings in a row with minimal wasted space between them.

It's definitely not the densest design possible, but it certainly seemed to let them fit a lot of fairly spacious 1-2 BRs in not a lot of space back in the early 20th c., and the height can scale up pretty well (though the elevator probably becomes at least a soft requirement above 4-5 floors).

[Pxtl]

I'm thinking more of a 10-floor building because I stayed in one with family in Buenos Aires that was like that several times.