
Montreal is, in many ways, a city of winding exterior stairs. If you've been there, then you know. The city is overwhelmingly a city of low-rise apartments (less than five storeys). And with these, comes lots of exterior circulation. But this tradition doesn't just apply to older buildings. Here is a contemporary tall-building example which follows a similar approach.
Designed by MSDL Architects, the project, called The Laurent & Clark, consists of two tower volumes. They read as two separate towers, but they're connected and share egress paths. On the east side is a conventional "scissor stair" tucked behind two elevators. And on the other end, connected by an open-air corridor, is an exterior exit stair that runs all the way up the tower.
Here is a circulation diagram via Azure:

This is novel (at least in this part of the world). The suites in the west tower are all dual aspect; meaning, they have windows on both ends.
They also have direct elevator access (see cores above), which means a lot less non-revenue generating circulation space. I mean, if you think about it, the open-air corridor on the north side of the west tower is akin to building a simple balcony. Extend the slab and add a guard rail. And so you could argue that this portion of the building has a near 100% efficiency factor.
However, the downside is that you need more elevators. Here, it looks like they have 6 for their 356 suites. That's an overall ratio of just under 60 suites per elevator, which is lower (i.e. better) than what you'd typically find in a conventional tower. The crude rule of thumb is 1 elevator for every 100 suites. That said, these direct-access suites would be premium.
But perhaps the most important takeaway is this: If cold and snowy Montreal is cool with open-air corridors and exterior exit stairs, then maybe your city should be as well.
Perhaps the two most distinctive features of Montreal's low-rise architectural landscape are (1) lots of exterior stairs and (2) lots of balconies. (Their density is, of course, also noteworthy, particularly in a North American context.)
The exterior stairs are somewhat curious to outsiders given all the snow the city gets. But it's maybe a good case study and follow-up to yesterday's post about 1925 Victoria Park Road and its proposed exterior corridors.
As for the second feature, the Globe and Mail recently published this wonderful little ode to the Montreal balcony. It is a great reminder that, when designed well, people really do love balconies and exterior spaces.
This is an ongoing debate in the world of multi-family development, and the outcomes often vary by city and sometimes by housing tenure. But at the end of the day, I have yet to meet anyone who doesn't appreciate getting outside in the summer.