11 gas dryers feeder

[wwhitney]

So suppose there is an 11-story building with one unit per floor but the laundry is out in a common area and not inside the unit. Unlikely scenario perhaps but where does that land us?

Sounds like only one unit would be likely to use each dryer, so it's only nominally a common area. I.e. as nothing tells us exactly how to draw the boundary of the dwelling, I'd happily assign each floor's dryer to that floor's dwelling and use the diversity factor for 11 dryers.

Cheers, Wayne