This is a lovely little infill rental project in Tokyo by ETHNOS (architect) for Real Partners (developer):
https://youtu.be/zXRlxh237Bo
The building is 4 storeys plus a rooftop terrace. From the plans, it looks like there are 8 units, all of which are two-storey suites.
The A and B suites are accessible from the ground floor. For the A suites, you enter at grade, and then go down into the first basement level. And for the B suites, you enter at grade and then go up to your second level. One of the entrances (suite B-3) is via an exterior walkway.
The middle of the ground floor is the lobby entrance and there's a single elevator that services the second and third floors (it then drops off for the fourth floor). On the second level is a co-working space, and so the upper C suites (these sound fancy) are all accessible from the third floor.
The fourth floor and fifth floor terraces are all accessible from within the C suites, which means that the only real common area corridors in this building are on the third level. And it looks like they wanted this particular corridor to have a view to the street, because they could have easily reduced it even further to increase the building's overall efficiency.
