Increasing office-building loans by 30% in city «M»
Banking
It isn't diversification: it's concentration in disguise.
In the scenario Avoided a concentration disguised as diversification in a declining market, before the next downturn.
The protagonist & the context
The head of commercial real-estate lending, with a portfolio growth target set by the board and a relationship team bringing new applications every week.
A regional bank with a traditionally conservative commercial property portfolio. City M is a mid-sized office hub that saw a construction boom in the pre-pandemic decade. Relationships with the main local developers go back twenty years.
Background
The mid-tier office market in city M shows contradictory signals: nominal occupancy rates hold up thanks to multi-year leases not yet up for renewal, but active search for new space is at a historic low. Remote work has reduced effective space demand per employee by 30–40% at medium-sized services firms — exactly the typical tenant of B and C grade offices. Prime buildings with high energy ratings and flexible layouts hold or appreciate; mid-tier has no such defense. The peak of rental contract expirations is clustered in 2025–2027, meaning price correction could materialize precisely as the bank needs to roll its exposure.
The dilemma
The office portfolio yields more than average: margins are attractive, collateral looks solid, clients are known. The issue is not the quality of individual loans — it is the structure of the portfolio. Thirty loans on different buildings in the same city in the same market segment are not thirty risks: they are one risk with thirty exposures. If the mid-tier market in M corrects — and the forces driving it down are structural, not cyclical — the collateral collapses together, clients struggle to refinance together, and the 2026–27 maturity wall arrives at exactly the worst moment.
Exhibits
Indexed transaction values for mid-tier offices in city M over the past six years — the post-pandemic correction has not been absorbed (illustrative data).
The contradictor's analysis
- Office values act as a floor: the collateral holds.
- After remote work, offices will fill up again.
- At maturity, clients will refinance without problems.
It looks like diversification, it's the opposite. Mid-tier offices in that city are in structural decline: remote work empties them, and those who remain pick only the best buildings. The point is that all the collateral would collapse together, for the same reason, at the same time — and most of the loans all mature in 2026-27. You don't have thirty different risks: you have one, repeated thirty times.
- Recalculating on real sale value (not appraisals), how many loans are worth more than the property?
- In past stress events, how often did all the collateral collapse together?
- How much matures within two years and will have to refinance at higher rates?
- If mid-tier offices lose 25%, how much loss and how much capital does it burn?
- How much of this «diversification» disappears in a crisis that hits everyone at once?
Provenance: transaction prices in the M market · current rent roll · loan maturity schedule · red-team base.
Resolution & consequences
Methodological note
Composite teaching case. Figures and details are illustrative; it is not a client outcome or a performance claim. Built, in the method of the Harvard Business Review, from recurring decision patterns in the sector, merged and anonymized to protect confidentiality. The «provenance» notes describe the type of evidence the engine cites with traceability in production. No Δ-CSI score is shown: composite cases have no frozen, reproducible scorecard.