Property owners and asset managers in institutional real estate operate in an increasingly layered ESG disclosure environment. GRESB drives investor-facing ESG scoring. CDP provides voluntary supply chain disclosure that is increasingly investor-requested. California SB 253 mandates Scope 3 disclosure for large entities. And the EU’s Corporate Sustainability Reporting Directive (CSRD) extends mandatory ESG reporting to European operations and, through supply chain due diligence requirements, reaches global real estate companies with EU exposure.
For BOMA members — building owners, REITs, asset managers — understanding which framework governs which obligations, and where they overlap, is essential for building an ESG program that satisfies all of them without duplicating work. This article maps each framework against the specific Scope 3 obligations it creates for property owners, with particular focus on the contractor supply chain data gap that sits at the intersection of all three.
GRESB: Investor-Driven, Asset-Level, Annual
GRESB is the primary ESG accountability mechanism for institutional real estate globally. It is not a regulation — it is an investor-driven benchmark that most institutional property owners participate in voluntarily because their capital partners require it. GRESB assessments are annual, asset-level, and scored on a 0–100 scale that investors use to compare portfolio ESG performance.
For Scope 3, GRESB evaluates both governance (do you have a Scope 3 target and supply chain policy?) and performance (do you have actual Scope 3 data?). Contractor emissions — Scope 3 Category 1 — factor into both components. Property owners without contractor data collection programs score lower on supply chain governance and leave Category 1 data fields blank in the Performance section.
GRESB is the most immediate Scope 3 pressure for most BOMA members because it directly affects your capital relationships. A poor GRESB score can affect asset valuations, borrowing costs, and investor mandates in ways that regulatory compliance does not.
CDP: Voluntary, Supply Chain Driven, Escalating
CDP’s supply chain program allows large corporations — including real estate companies’ major tenants and capital partners — to request Scope 3 supply chain data from their vendors. For property owners, CDP requests typically arrive from two directions: from institutional tenants whose corporate ESG programs require supply chain data from their landlords, and from institutional investors whose own CDP commitments require portfolio-level Scope 3 supply chain data.
CDP participation is voluntary, but declining a CDP request from a major tenant or capital partner has commercial consequences. As CDP participation expands — the program now covers thousands of companies — the probability that a significant counterparty will request Scope 3 data from your organization continues to increase.
California SB 253: Mandatory, Regulated, Enforced
SB 253 is the only mandatory framework in this set, at least for US-domiciled organizations. It applies to entities doing business in California with revenues above the threshold, requires Scope 1 and 2 disclosure starting with fiscal year 2025 data, and adds Scope 3 starting with fiscal year 2026 data. CARB administers the program and has authority to assess penalties for non-compliance and material misstatement.
For real estate entities with California assets, SB 253 transforms the Scope 3 contractor data question from an investor relations consideration into a legal compliance obligation. The same contractor emissions data that improves your GRESB score and satisfies CDP supply chain requests now also needs to be accurate enough to withstand CARB review.
Where Restoration Contractor Data Fits in Each Framework
The Restoration Carbon Protocol addresses the same data gap across all three frameworks. An RCP-compliant restoration contractor provides project-level emissions data in a format aligned with GHG Protocol Category 1. That data feeds directly into your GRESB Performance section, satisfies CDP supply chain data requests for Category 1, and provides the documented, methodology-backed Scope 3 Category 1 data that SB 253 requires.
The strategic efficiency argument for RCP adoption by property owners is that solving the restoration contractor data problem once solves it for all three frameworks simultaneously. You do not need different data for GRESB, CDP, and SB 253 — you need GHG Protocol Category 1 data, and RCP produces it in that format.
Building a Unified Response
For BOMA members navigating GRESB, CDP, and SB 253 simultaneously, the most efficient path is a unified Scope 3 data program rather than three separate compliance efforts. The foundation is a GHG Protocol-aligned inventory methodology that covers all fifteen Scope 3 categories. Contractor data — collected through RCP-compliant vendor agreements and green lease extensions — feeds into that inventory once and satisfies all three frameworks.
The timeline pressure is real: SB 253 Scope 3 data collection for fiscal year 2026 should already be underway, GRESB 2026 assessments will open in the first quarter, and CDP supply chain requests arrive year-round. The property owners who have built the contractor data infrastructure now — preferred vendor panels with RCP adoption, ESG clauses in service agreements, documented methodology — will be the ones with defensible Scope 3 inventories when all three frameworks converge on the same data set in 2027.
Frequently Asked Questions
Does GRESB require the same data as SB 253?
Both require Scope 3 GHG data aligned with the GHG Protocol Corporate Standard. GRESB collects it through an annual assessment submitted to the benchmark platform. SB 253 requires public disclosure filed with CARB. The underlying data set is the same — a GHG Protocol-compliant Scope 3 inventory by category — which is why building one unified inventory program satisfies both frameworks efficiently.
How does CSRD affect US-based property owners?
The EU’s Corporate Sustainability Reporting Directive (CSRD) applies directly to large EU-domiciled companies and EU subsidiaries of non-EU companies above defined thresholds. For US-based real estate companies with EU operations or EU-listed capital partners, CSRD may apply directly. Even for those it does not reach directly, CSRD’s supply chain due diligence requirements mean EU-based capital partners and tenants will increasingly request Scope 3 supply chain data from their US counterparties as part of their own CSRD compliance.
What is the Restoration Carbon Protocol and why do BOMA members need it?
The Restoration Carbon Protocol (RCP) is an industry self-standard that gives restoration contractors a structured GHG accounting methodology for project-level emissions reporting. For BOMA members, RCP-compliant contractors provide the Scope 3 Category 1 data needed for GRESB performance scores, CDP supply chain responses, and SB 253 mandatory disclosure — in a format directly compatible with GHG Protocol reporting requirements.
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