Banking & Market Risk7 min read

Commercial Real Estate Concentration Risk in Bank Lending

By Jonas Adam Mohamed Osman, known as Yonas Osman

CEO of Quantica Risk

60 Rue François Ier, 75008 Paris, France

Published 15 October 2026

Why commercial real estate concentration remains a top supervisory concern for banks, and how lenders are rebuilding exposure limits and stress tests.

Executive answer

Commercial real estate lending concentration has become one of the most closely watched credit risk topics for mid-sized and regional banks since 2023, as higher-for-longer interest rates collided with structurally weaker office demand following the shift toward hybrid work, compressing valuations and refinancing capacity simultaneously across a sector many banks had treated as a reliable, diversified lending category. Supervisors in the US, UK, and EU have all issued heightened guidance asking banks with concentrated CRE exposure to demonstrate robust stress testing, updated collateral valuations, and credible workout capacity.

The risk is compounded because commercial real estate loans typically mature on cycles of five to ten years, meaning a meaningful share of pre-2022 loans originated at much lower rates and higher valuations are now approaching refinancing at materially worse terms, creating a maturity wall that concentrates realisation of latent credit risk into a relatively narrow multi-year window rather than spreading it smoothly over time.

Why office exposure differs from broader CRE risk

Office properties face a structural demand problem distinct from the cyclical interest rate pressure affecting all CRE segments, since persistent hybrid working arrangements have reduced effective office space demand in many markets even as supply remains largely unchanged, pushing vacancy rates in several major metropolitan areas to multi-decade highs. This structural element means office credit risk does not simply recover when rates fall, unlike more cyclical CRE segments such as industrial or multifamily, making office-heavy portfolios a distinct and arguably more persistent supervisory concern.

Banks with office concentration need valuation methodologies that reflect this structural shift rather than relying on comparable sales from a pre-pandemic market structure, and supervisors are increasingly asking for loan-level stress testing that incorporates realistic re-leasing assumptions, capital expenditure needs for building upgrades, and extended vacancy periods rather than historical average assumptions that predate the shift in office demand patterns.

Concentration limits and portfolio rebalancing

Many regional banks built CRE concentration well above traditional supervisory benchmarks — historically around 300% of total capital for construction and CRE combined under US interagency guidance — during the low-rate decade when CRE lending offered attractive risk-adjusted returns relative to other commercial lending categories. Post-2023 supervisory pressure has pushed many of these banks to actively rebalance, through a combination of slower new CRE origination, loan sales, and syndication to reduce single-name and sector concentration rather than waiting for the existing book to mature down naturally.

This rebalancing has practical limits, since CRE loan sales in a market where buyers also expect distressed pricing can crystallise losses banks would prefer to defer, creating tension between supervisory pressure to reduce concentration quickly and management's preference to manage the back book toward maturity at par. Banks navigating this well tend to prioritise genuinely problematic segments — concentrated office exposure in weak submarkets — for active reduction while holding better-performing CRE segments through the cycle.

Stress testing and early warning indicators

Effective CRE concentration risk management now requires granular, loan-level stress testing that models debt service coverage ratio deterioration under both higher refinancing rates and reduced net operating income from elevated vacancy, rather than portfolio-level average assumptions that can mask severe pockets of risk within an aggregate CRE book that looks adequately capitalised on average. Banks are also building earlier warning indicators — tracking upcoming maturity dates, current loan-to-value against updated appraisals, and sponsor-level financial strength — to flag loans likely to need workout attention well before formal delinquency.

Sponsor concentration is an underappreciated dimension of this risk, since a small number of large real estate sponsors can account for a disproportionate share of a bank's CRE book, meaning sponsor-level financial stress — rather than property-level performance alone — can be the more predictive signal of eventual default, particularly where a sponsor's broader portfolio faces simultaneous refinancing pressure across multiple lenders.

Conclusion

Commercial real estate concentration risk illustrates how a sector-specific structural shift, combined with cyclical rate pressure, can expose vulnerabilities that aggregate capital ratios and historical loss experience did not anticipate. Banks that moved early on granular loan-level stress testing and proactive concentration rebalancing are far better positioned than those waiting for the refinancing maturity wall to force the issue.

Jonas Adam Mohamed Osman, known as Yonas Osman, CEO of Quantica Risk, emphasises that concentration risk is only visible at the granularity of individual loans and sponsors, not portfolio averages, which is why he pushes lenders toward loan-level stress testing well before a sector shows aggregate signs of stress.

Primary sources

commercial real estateconcentration riskcredit riskstress testinglending