APAC’s commercial property market is splitting into two distinct tiers, and the divide is widening faster than most building owners have had time to respond to. Grade A office towers are pulling ahead on rent, occupancy, and tenant quality. A large and economically important stock of Grade B and older commercial assets is being left to contend with rising vacancies, shrinking tenant options, and sustainability obligations they are not yet equipped to meet.

The temptation is to treat this as an inevitable consequence of market forces. It is not. The gap between Grade A and Grade B did not begin with bricks and mortar. It began with data. And that means it is a gap that can be closed.

Where Grade A Has Gone

The commercial advantage that green-certified buildings now enjoy in APAC is no longer marginal. In Singapore, Green Mark certified buildings in the CBD command rents up to 12% higher than non-certified peers, with occupancy rates running 2.5 to 4 percentage points above the market.¹ In Australia, all-electric office buildings are achieving 23% higher net face rents, 7.8% lower vacancy rates, and 55 basis points tighter yields compared with conventional stock.²

These are not modest premiums. They represent a meaningful and widening commercial advantage, and they do not exist simply because these buildings are newer or better located. They exist because the owners of these buildings made a foundational decision: to build the data infrastructure that makes sustainability performance visible, verifiable, and reportable.

That decision, made years ago in many cases, is now compounding. Green certifications followed. Green leases became possible. ESG disclosures became manageable rather than painful. Each step was made easier by the one before it, and all of it traces back to a basic capability: knowing what the building actually consumes.

The Scale of What Remains

The buildings that have not made that journey represent the majority of APAC’s commercial stock, and the numbers make the scale of the challenge difficult to set aside.

As of December 2025, Singapore had greened approximately 66% of its building stock under the BCA Green Mark scheme, against a national target of 80% by 2030.³ That leaves a significant portion of buildings, many of them Grade B and older commercial assets, outside the framework with four years remaining on the clock. In Australia, nearly 70% of NABERS-rated office buildings face a potential ratings downgrade following methodology changes introduced in July 2025.⁴ Across the broader region, JLL estimates that by 2030, 63% of forecast demand for low-carbon leases in cities including Sydney, Melbourne, and Kuala Lumpur will go unmet by current supply pipelines.⁵

It would be easy to read these figures as evidence of an industry failing to keep pace. A more useful reading is that they represent a significant group of building owners who have not yet found a practical entry point into sustainability performance, and who are running out of time to find one.

Why Grade B Still Matters

Grade B buildings are not marginal assets. They house a substantial share of APAC’s business ecosystem: professional services firms, growing businesses, organisations that do not have the budget or the need for a Marina Bay tower but whose tenants are arriving with sustainability obligations that are no less real.

Those tenants are increasingly subject to mandatory reporting under frameworks like Singapore’s SGX RegCo climate disclosure requirements and Australia’s AASB S2 sustainability reporting standards, which took effect from 2025.⁶ When they report on Scope 1 and 2 emissions, they need consumption data from the buildings they occupy. When they negotiate green leases, they need landlords who can track and verify performance. When they set Science-Based Targets, they need to know whether their building is helping or hindering.

A Grade B building that cannot answer these questions is not just a sustainability problem. It is a leasing problem. JLL’s research on Hong Kong’s aging office stock found that poorly maintained buildings over 30 years old risk value declines of up to 20%, driven in part by their inability to meet tenant expectations.⁷ The same structural forces are visible across Singapore and Australia, moving at different speeds but in the same direction.

What is Actually Holding Things Back

Speak to property managers running mixed portfolios and a consistent picture emerges. Grade A buildings tend to have sophisticated building management systems, dedicated facilities teams, and established reporting processes. Grade B buildings often have BMS data that exists but has never been connected to anything analytically useful.

The practical consequence is that sustainability performance across a Grade B portfolio is often estimated rather than measured. Tenant consumption queries get answered with manually compiled spreadsheets. Emissions disclosures involve reconciling utility bills and making assumptions. Green lease conversations stall because the underlying data infrastructure to support them does not exist.

Many building owners, looking at this situation, conclude that the solution is a physical retrofit and that the cost of a physical retrofit places sustainability out of reach. This is a reasonable instinct that leads to the wrong conclusion, because it skips the step that has to come first.

Before any retrofit decision can be made intelligently, a building owner needs a baseline. Which buildings in the portfolio are performing well, and which are consuming energy they cannot account for? Which tenants are using more than their fair share, and which are efficient? Where are the emissions actually coming from? Without this information, retrofit decisions are made on assumption rather than evidence, and the outcomes reflect that.

A Different Starting Point

The more useful framing for Grade B owners is not whether they can afford to upgrade their buildings, but whether they can afford not to understand them.

Data visibility is available today without a hardware project, without a systems integration programme, and without a capital expenditure approval process. The building management systems that most Grade B assets already have are capable of generating the data that matters. The gap is not in the hardware. It is in connecting that data to something that makes it legible and useful.

iviva’s sustainability intelligence platform illustrates what this looks like in practice. Across one existing deployment covering 18 buildings and 4,000 utility meters, BMS data is auto-forwarded daily as CSV files, no integration project required. The result is 250,000 data points processed every day, with two to three years of historical data available for analysis. Portfolio dashboards, tenant consumption reports, and carbon emissions visibility are all running on the infrastructure that was already on site.

This is not a transformation programme. It is a decision to make use of what already exists. And it is the decision that makes every subsequent choice, about retrofits, certifications, green leases, and ESG disclosures, something that can be made from evidence rather than guesswork.

The Window is Narrowing

Singapore’s 2030 Green Mark targets are four years away. Australia’s NABERS thresholds have already moved, and are moving again.⁸ Tenant sustainability obligations are not a future consideration. They are present-day leasing criteria.

The buildings most at risk in this environment are not necessarily the oldest or the most poorly maintained. They are the ones whose owners have the least reliable picture of what is happening inside them. That is a fixable problem, and it is the one worth fixing first.

Grade B buildings are too important to APAC’s commercial ecosystem to be written off. The question is not whether they can compete. It is whether their owners will act in time to give them the chance.