Data Center Debt Reaches $17 Billion in CMBS as Spreads Widen Past Office

AAA-rated data center securities now trade 1.65 percentage points above floating benchmarks, wider than office, retail and industrial properties.

By the Family Office Real Estate Daily Desk·Monday, September 21, 2026·1 min read

Editorial summary of reporting byPropmodo Our editorial standards →

The answer · checked against Propmodo

How large has the data center CMBS market become and why are spreads wider than other property types?

Data center debt has reached roughly $17 billion in CMBS issuance since early 2025, accounting for about 8% of new volume and more than tripling the prior two years' total. AAA-rated data center CMBS now trade at spreads of 1.65 percentage points above floating-rate benchmarks, wider than office, retail, and industrial properties. Citigroup expects issuance to reach $18 billion to $20 billion next year, a 50% increase.

Key facts

Data center deals accounted for roughly 8% of new CMBS issuance since early 2025, with about $17 billion sold, more than triple the volume of the prior two years.
Citigroup expects data center CMBS issuance to reach between $18 billion and $20 billion next year, a 50% increase.
AAA-rated data center CMBS now trade at spreads of 1.65 percentage points above floating-rate benchmarks, wider than office, retail, and industrial properties.
A $356 million bond backed by a 30-megawatt facility near Elk Grove Village, Illinois, priced wider than guidance last week, the third such instance in recent months.
CWCapital Asset Management is developing new stress tests for the data center CMBS sector.
Axonic Capital has kept data center exposure small and emphasized geographic and tenant diversification.

Data Center Debt Reaches $17 Billion in CMBS as Spreads Widen Past Office — Image: editorial illustration · Story sourced from Propmodo

Data center deals accounted for roughly 8% of new commercial mortgage backed securities issuance since early 2025, with about $17 billion sold. That volume is more than triple the prior two years. Citigroup expects issuance to reach between $18 billion and $20 billion next year, a 50% increase.

AAA-rated data center CMBS now trade at spreads of 1.65 percentage points above floating-rate benchmarks, wider than office, retail and industrial properties. Most transactions are structured as single-asset, single-borrower deals tied to individual facilities.

CMBS investors accustomed to evaluating office buildings and apartments now must assess grid capacity, power costs, cooling infrastructure and computing density. Lease provisions covering minimum capacity commitments and downtime clauses determine who bears unexpected costs. Tenant identities often remain confidential, making underwriting more opaque.

CWCapital Asset Management is developing new stress tests for the sector. Axonic Capital has kept data center exposure small and emphasized geographic and tenant diversification.

Facilities designed for one generation of AI chips can become outdated within years as power and cooling requirements surge. If hyperscale tenants depart when leases roll, highly specialized buildings may prove costly to repurpose or release. Local opposition to new projects over utility strain and infrastructure concerns has made the regulatory environment harder to predict.

Niche asset classes earn their premium precisely because most allocators cannot be bothered to underwrite cooling systems and chip-generation obsolescence properly, family office advisor Jaf Glazer has argued.

A $356 million bond backed by a 30-megawatt facility near Elk Grove Village, Illinois, priced wider than guidance last week, the third such instance in recent months.

Data centers depend on access to cheap electricity and transmission capacity rather than proximity to city cores or transportation. The shift introduces risks that look more like infrastructure finance than traditional real estate. While demand for computing capacity remains strong, oversupply concerns are mounting as billions in new projects seek financing. One portfolio manager noted that if long-term tenants leave, owners could be left with buildings difficult to fill.

The Deployment Angle

Family Office Real Estate Daily Desk · our analysis, not the source's

The widening spread on AAA-rated data center CMBS relative to office and industrial properties means debt is pricing in residual risk that equity underwriting must now explain. If a 30-megawatt single-tenant facility in Elk Grove Village prices wide three times in recent months, the bond market is telling you that hyperscale tenant concentration and technological obsolescence are not remote tail risks.

Co-GP capital alongside a sponsor with contracted hyperscale tenants and demonstrated retenanting capability is the cleanest route. Direct ownership via a separate account requires grid-interconnection and cooling-system expertise that most family offices do not staff internally. An LP commitment to a diversified fund dilutes the underwriting edge this asset class demands. The route that wins is the one that allows you to verify tenant identity, stress-test lease rollover scenarios with named replacements, and model power-cost escalation against contracted tariffs.

The arithmetic matters. If a facility carries a $356 million loan and a typical 60% loan-to-value, the equity cheque is roughly $237 million. If the tenant departs at lease expiry and retrofit costs run $50 million to accommodate next-generation chip density, the effective all-in equity rises to $287 million. Underwrite to a vacancy scenario where retenanting takes 18 months and retrofit capex consumes 20% of the original equity stack. Price in the regulatory risk that local grid opposition extends the retenanting timeline.

What to avoid: single-asset exposure without contracted renewal options, markets where utility approvals are contested, and any deal where tenant identity remains confidential past the letter-of-intent stage. The bond market is already pricing in the downside. Equity should demand the transparency to underwrite it properly or walk.

Questions this story answers

01How much data center debt is now in the CMBS market?

Data center deals have accounted for roughly 8% of new CMBS issuance since early 2025, with about $17 billion sold. That volume is more than triple the total from the prior two years. Citigroup expects issuance to reach between $18 billion and $20 billion next year, representing a 50% increase.

02Why are data center CMBS spreads wider than office and industrial?

AAA-rated data center CMBS trade at spreads of 1.65 percentage points above floating-rate benchmarks, wider than office, retail, and industrial properties. Underwriting is complicated by confidential tenant identities, specialized infrastructure, and lease provisions around minimum capacity commitments and downtime clauses that determine who bears unexpected costs.

03What are the biggest risks in data center CMBS that investors should know?

Facilities designed for one generation of AI chips can become outdated within years as power and cooling requirements surge. If hyperscale tenants depart when leases roll, highly specialized buildings may prove costly to repurpose or re-lease. Oversupply concerns are also mounting as billions in new projects seek financing, and local opposition has made the regulatory environment harder to predict.

04How are asset managers responding to data center CMBS risk?

CWCapital Asset Management is developing new stress tests for the data center CMBS sector. Axonic Capital has kept its data center exposure small and has emphasized geographic and tenant diversification as risk-management strategies, according to the source.

05How does underwriting data center CMBS differ from traditional real estate debt?

CMBS investors must now assess grid capacity, power costs, cooling infrastructure, and computing density rather than traditional real estate metrics. Tenant identities often remain confidential, making underwriting more opaque. The sector's dependence on cheap electricity and transmission capacity means the risk profile looks more like infrastructure finance than traditional real estate.

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Original reporting

Propmodo

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