Exactly what it says on the can. Goes together with other CCMS-buildings like a hand in a glove.
About this creation
Inspired by several, ridiculously narrow buildings in Japan, I wanted to design a CCMS-building to go along with my 24-wide "Blue Bargains Bookstore", itself meant to even out the imbalance an eight-wide building would cause, or another 24-wide for that matter. And like the real deal, when this one stands alone it looks like it'll fall on its side at the smallest hint of wind. The thing is that I think that buildings that are this narrow have a special charm to them, and that their size make them a special challenge to build, since the space to build in is so extremely limited. Further, a CCMS should in my opinion be "functional", and not just an empty facade. That means an interior, or at least the possibilty for it.
A major component in its design is its minimalism. The wall facing the sidewalk is nothing more than a window and a door, and the section of the walls closest to the doors are made up of panels, to avoid the nagging effect one-stud wide walls have when placed directly up against a window. The ground floor is also meant to hold a small shop, but I am currently at a loss at what sort of shop that would fit inside the tiny footprint, without sacrificing the staircase (yes!) to the next floor. And if isn't obvious from the fancy tiling and chalk-white walls, a fancy brand-store would be preferable.
The flat itself is divided between the two upper floors. Again, there is a staircase leading up the upper floor, and here there is even some railing to prevent clumsy minifigs from falling down the extremely narrow stairs. With some creativity there shouldn't really be much trouble getting an interior in here. It'll be cramped, sure, but that's the price of living in a box. The upper floor looks just like this one, except it is two studs shallower due to the door and windows being recessed, but has on the other hand no staircase to eat up valuable space. Also, the mid-floor section is built to be repeatable, which means multiple identical modules will fit on top of another, unlike my two previous buildings.
This is how the building looks like when squeezed in between my two earlier buildings. What was once a very narrow and disproportionally tall building suddenly looks much better, thanks to the other buildings. The building was already from the start meant to rely on other buildings for it to stand out, but not like a sore thumb.