AI Data Centres and Cooling Demand Are Reshaping Adelaide's Office Market From the Ground Up

Adelaide's commercial property market is splitting in two. Premium office space in the CBD core is holding firm, while B-grade stock from the mid-2000s is quietly haemorrhaging tenants — and the pressure driving that divide is increasingly coming from offshore.

The immediate trigger is land. Across Australia's eastern capitals, hyperscale data centre operators are competing aggressively for large industrial and commercial sites, pushing up values for serviced, well-connected parcels and crowding out other uses. That dynamic is now migrating to Adelaide. The state government's push to position South Australia as a clean-energy hub — anchored partly by the $593 million Hydrogen Jobs Plan — has attracted data centre developers who want access to renewable power at scale. Several large sites in the Edinburgh Parks precinct, north of the city, are under active assessment for data infrastructure proposals, according to planning documents filed with the Department for Infrastructure and Transport this year.

What This Means for the CBD

The knock-on effect for traditional office stock is real and measurable. When industrial-zoned land near Edinburgh Parks or the Tonsley Innovation District gets absorbed by data centre footprints, logistics operators and light manufacturers get displaced. Some end up converting older office buildings on the fringe of the CBD — particularly along West Terrace and the southern end of King William Street — into hybrid warehousing and last-mile distribution hubs. That takes supply off the leasing market, but not in a way that benefits conventional office tenants looking for affordable space.

Meanwhile, the national picture reinforces local pressures. The Property Council of Australia's Office Market Report for the first half of 2026 recorded Adelaide's CBD office vacancy rate at 17.4 per cent — marginally improved from 18.1 per cent in mid-2025 but still well above the long-run average of around 12 per cent. Prime-grade vacancy sits closer to 10 per cent, with buildings like 60 King William Street and the GPT-managed 151 Pirie Street commanding net face rents of between $480 and $530 per square metre annually. Secondary stock, particularly along Currie Street and the western end of the CBD, is stagnating at $290 to $340 per square metre, and incentives — rent-free periods and fitout contributions — are running at 35 to 40 per cent of total lease value.

Hybrid working is no longer a temporary experiment. South Australian public service agencies, which collectively occupy a significant share of the CBD's lettable area, have been quietly reducing their footprints as lease expiries roll through 2025 and 2026. The Department of Treasury and Finance confirmed in March it was consolidating staff from three separate tenancies into a single floor plate at 200 Victoria Square. That kind of consolidation, replicated across multiple government and private-sector tenants, keeps vacancy stubbornly elevated even as headline economic conditions look reasonable.

What Landlords and Tenants Should Watch

The practical advice from commercial agents active in the market is consistent: tenants with lease expiries falling before December 2027 are in a strong negotiating position right now, particularly for B-grade space where landlords are desperate to avoid prolonged vacancy. Incentive packages that were unthinkable three years ago — including full fitouts valued at $800 to $1,000 per square metre funded by the landlord — are now on the table for five-year commitments.

For property owners, the calculus is harder. Retrofitting older buildings to meet the minimum five-star NABERS Energy rating that large corporate tenants now demand routinely costs $3 million to $6 million per floor plate. Those who cannot fund that upgrade are increasingly looking at conversion: either to build-to-rent residential, following the precedent set by the former Westpac House site on King William Street, or to specialist uses tied directly to the data centre and tech sector's supply chain needs.

The next six months will matter. If the state government finalises its data and digital infrastructure policy — flagged for release in the third quarter of 2026 — it could either accelerate land pressures further or carve out explicit protections for commercial office precincts. Either way, decisions being made in Canberra, Seattle and Singapore about where to build the next generation of computing infrastructure are already showing up in Adelaide lease negotiations, whether tenants realise it or not.