Melbourne's Office Market Faces Its Toughest Year Yet

Melbourne's CBD office market entered the second half of 2026 with vacancy rates sitting at their highest level in more than three decades, according to Property Council of Australia data, with roughly 17.3 per cent of city office space sitting empty as of June. That number has not budged meaningfully since the start of the year, and there are few catalysts on the horizon to change it quickly.

The stakes are significant. Commercial property underpins billions of dollars in superannuation fund portfolios, local government rate revenues, and the economic health of the CBD itself. When buildings on Collins Street and Bourke Street stay dark, the cafés, dry-cleaners and carpark operators underneath them feel it too. The sector is now contending with at least four distinct pressures hitting simultaneously — and landlords who assumed hybrid work was a temporary disruption are quietly revising that assumption.

Supply, Demand and the AI Wild Card

The most immediate problem is a supply overhang that pre-dates the pandemic but has never properly resolved. The recently completed 600 Collins Street tower added more than 60,000 square metres of premium space to a market already struggling to absorb what it had. Sublease availability — space that tenants are offloading before their leases expire — now accounts for nearly a quarter of total vacant stock in the CBD, according to CBRE Melbourne research published in May.

Effective rents on A-grade stock in the traditional legal and financial precinct around William Street have fallen around 8 per cent in real terms over the past 18 months as landlords pile on incentive packages — fit-out contributions, rent-free periods of up to 18 months — to lock in tenants. Net face rents have been stickier, masking the true compression. Investors pricing assets for sale are discovering that gap quickly.

A newer and less expected headwind comes from the industrial land market. Demand from hyperscale AI datacentre developers — several of whom are scouting sites in Melbourne's outer east and west, including around the Laverton and Dandenong South corridors — is driving industrial land values sharply higher. That is forcing logistics and light manufacturing tenants deeper into the suburban fringe, which sounds unrelated to the CBD office market until you trace the knock-on effect: freight and distribution cost increases get passed through supply chains, feeding into the broader inflationary environment that keeps the Reserve Bank of Australia cautious about rate cuts. Delayed rate relief means delayed relief for leveraged commercial property owners carrying debt at current levels.

Conversion Talk, and the Limits of It

The most frequently cited solution to surplus office stock — converting B and C-grade towers into residential apartments — has gained almost no traction in Melbourne at scale. The City of Melbourne's own planning framework, updated in late 2024, was meant to streamline such conversions, but the economics remain punishing. Floor-plate sizes in most 1980s and 1990s towers on Exhibition Street make compliant residential layouts expensive to engineer. Construction costs have not fallen. Developers are not rushing.

Dexus, one of the largest office landlords in the Melbourne CBD, has publicly flagged asset repositioning as a strategic priority, but repositioning a 40-storey tower in Southbank is a multi-year project, not a quarterly fix. Meanwhile, smaller private landlords owning half-empty buildings in the Docklands precinct — where vacancy has consistently outrun the broader CBD average — face more immediate cash-flow pressure with fewer options.

The practical outlook for the rest of 2026 is consolidation rather than recovery. Tenants whose leases expire before December are in a strong negotiating position and should be using it. Fund managers with meaningful exposure to unlisted commercial property trusts should be scrutinising the incentive-adjusted yield figures, not the face rents in the marketing materials. And the next meaningful test for the market comes in September, when the Property Council releases its mid-year office figures — a number that will tell landlords, investors and the City of Melbourne whether the floor has actually been found, or whether this year's headwinds have further to run.