Ottawa's downtown office vacancy rate fell in the second quarter of 2026, according to new figures from Ottawa Business Journal — but the numbers come with an asterisk that local commercial real estate watchers will want to pay attention to.
The drop wasn't driven primarily by a wave of new leases or returning tenants. Instead, two highrise office towers in the downtown core were pulled from the active leasing inventory during the quarter, which mechanically shrank the pool of available space landlords are tracking. When buildings are slated for conversion, redevelopment, or are otherwise taken offline, they stop counting toward the vacancy calculation — even if the space inside them was sitting empty for years.
Why this matters for downtown Ottawa
Ottawa's downtown core has been grappling with stubbornly high office vacancy since the pandemic reshaped how the federal government and private employers use office space. With so many public servants working hybrid schedules, landlords in the ByWard Market, Centretown, and the Sparks Street corridor have spent years watching towers that once hummed with 9-to-5 traffic sit half-empty.
That has real consequences beyond just landlords' bottom lines. Vacant office towers mean fewer lunchtime customers for downtown restaurants and cafes, less foot traffic supporting retail on Sparks Street and Bank Street, and reduced property tax assessments that can ripple into the city's broader budget picture. Ottawa's downtown business improvement areas have been vocal for years about wanting to see office-to-residential conversions accelerate as one way to fill some of that gap.
The office-to-residential angle
The removal of the two highrises from leasing inventory is itself a sign of where the market may be heading. Buildings pulled from active leasing are frequently headed toward conversion — often into residential units, given Ottawa's ongoing housing crunch and the city's push to make downtown conversions more financially viable through incentives and streamlined permitting.
If that's the case here, it would fit a pattern playing out in other Canadian downtowns, where aging, hard-to-lease office stock — often older buildings with layouts and mechanical systems that are expensive to retrofit for modern tenants — gets repurposed for housing rather than sitting vacant indefinitely. For Ottawa, which has pushed to add more downtown housing supply near transit and existing services, converting underused office towers is frequently cited as a faster path to new units than building from scratch.
Reading the numbers carefully
Commercial real estate analysts caution against reading a headline vacancy-rate improvement as proof that Ottawa's office market has turned a corner. A rate can fall either because tenants are filling space, or because the denominator — total leasable space — shrinks. In this case, it appears to be largely the latter.
That distinction matters for anyone trying to gauge the actual health of downtown Ottawa's commercial market: employers considering a lease, developers eyeing conversion opportunities, or residents wondering whether downtown foot traffic will pick back up. The underlying demand for downtown office space in Ottawa hasn't necessarily grown — the available supply has just gotten smaller.
Still, fewer empty towers technically counted as "available" could be a quiet signal that Ottawa's downtown is beginning the slow process of right-sizing its office stock for a post-pandemic hybrid-work reality, even if it's happening one building conversion at a time rather than through a rush of new leasing activity.
Source: Ottawa Business Journal (obj.ca)
