Our industry is engaged in an important dialogue to improve the efficiency and resilience of real assets through transparency and industry collaboration. This article is a contribution to this larger conversation and does not necessarily reflect GRESB’s position.
For years, the case for GRESB participation has been made through the lens of investor transparency, comparable sustainability performance, and limited partner (LP) confidence. These remain compelling reasons, but a new argument has emerged that speaks directly to asset value, fund performance, and fiduciary duty and is arguably more powerful.
The Royal Institution of Chartered Surveyors (RICS) has made ESG integration in commercial valuations mandatory. As of April 30, 2026, valuers operating under the RICS Red Book are required to consider, collect, and reflect ESG-related data in their assessments of commercial real estate. This is no longer guidance. It is a professional standard.
The question for private equity real estate (PERE) investors, asset managers, and fund managers is straightforward: where does that data come from?
The answer is largely already sitting inside the GRESB Assessment.
At Rider Levett Bucknall (RLB), we compared the RICS framework with the GRESB assessment and matched each ESG data point required by RICS valuers to the relevant GRESB indicators. The results are clear:
- 95.5% of RICS ESG data requirements are directly addressed by GRESB indicators.
- 64.2% of GRESB indicators map precisely to the RICS requirement.
- 31.3% of GRESB data satisfies the RICS requirement with minor supplementation.
- Zero RICS requirements have no GRESB coverage.
Across every major sustainability theme—energy performance, greenhouse gas (GHG) emissions, water consumption, waste management, climate risk, biodiversity, health and well-being, and governance—the GRESB assessment captures the data that RICS valuers are now mandated to consider.
This is because both frameworks are responding to the same market reality: sustainability credentials are material to asset performance, and that the absence of credible sustainability data is itself a risk factor that must be reflected in valuation.
Two pathways, one decision
The implications for real estate investment professionals are direct and consequential.
First, there is the Green Premium Pathway: assets with robust, validated sustainability data—the kind that GRESB participation generates—are now positioned to benefit from tangible valuation uplifts.
Valuers can evidence yield compression through demonstrated energy efficiency and reduced operating costs, support stronger rental assumptions where occupier demand for sustainable space is evidenced, justify lower void risk where health, well-being, and certification credentials attract and retain high-quality tenants, and they can underpin exit assumptions with the confidence that the asset will remain institutionally investable as sustainability requirements tighten further.
The other option is the Brown Discount Pathway: under the new RICS standard, valuers are required to flag data gaps explicitly. An asset that cannot evidence its energy performance, GHG trajectory, climate risk exposure, or governance framework does not simply receive a neutral valuation. It receives one that reflects uncertainty, potential capex liability, and reduced liquidity. In a market where institutional capital is increasingly sustainability-conditional, that uncertainty has a price.
This means the decision whether or not to participate in GRESB is not only a disclosure choice—it is a value management decision.
What this means for PERE
The private equity real estate sector has historically operated with less standardized sustainability reporting than listed vehicles. That gap is closing rapidly, driven by LP demands, regulatory pressure, and now the formalization of ESG in valuation methodology.
For PERE fund managers, the GRESB assessment offers a structured, internationally recognized standard that generates precisely the data now required at asset level by RICS, and at fund level by LPs, regulators, and increasingly by lenders applying their own sustainability-linked covenants.
The cost of not collecting this data is no longer abstract. It is measurable in yield adjustments, capex provisions, exit pricing, and in the growing difficulty of attracting institutional co-investment into assets that cannot demonstrate sustainability credibility.
The importance of intelligence that goes beyond reporting
GRESB participation generates the validated, comparable sustainability evidence base that now directly influences how assets are valued, financed, and traded.
For investors and managers who are already participating, the message is to ensure that GRESB data is being actively used in valuation conversations, rather than only within the assessment cycle. For those who are not yet participating, the question is no longer whether ESG data matters to value—the RICS standard has answered that. The question now is: are you collecting it?
This article was written by By Cedric Cools, Partner and Head of ESG, UK and Europe, at Rider Levett Bucknall (RLB). Learn more about Rider Levett Bucknall (RLB) here.
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