It's fun to examine projects that I could never underwrite or build in Toronto. Here's another one from Tokyo — a 10-storey, single-stair apartment building on a busy street, next to a metro station.
The site itself is only 59.49 m2 (~640 ft2), and the building footprint is 47.97 m2 (~516 sf), for a total of 388.28 m2 (~4,179 ft2). There's retail on the first and second floors, one home per floor on levels 3 through 8, and then a two-storey home on levels 9 and 10. All of this is serviced by a single elevator, and a single open-air egress stair off the back.
The building itself uses a simple structural system involving 6 columns (which you can see evenly placed on the plans). According to the architect's notes , they started with a simple 4-column design, but apparently the columns were too large and compromised the suite layouts.
Tokyo is a unique city and this kind of housing wouldn't work everywhere. But there's a universal lesson here: removing barriers and allowing small infill projects is a good thing for cities. Until these projects are feasible, we won't know exactly what the market actually wants and could support.
Photos from Hiroyuki Ito Architects