Analysis · Comparisons · 6 min read
Data centre ABS or CMBS?
Both refinance stabilised, leased data centres in the bond market. They differ in what investors are secured on, how the debt grows with the portfolio, and how refinancing risk is handled.
- 01ABS is built for a growing portfolio: a master trust adds buildings and issues new series over time.
- 02CMBS, usually single-asset single-borrower, suits one large campus or portfolio refinanced in one go.
- 03Since July 2026, qualifying US data centre ABS can sit outside the Exchange Act ABS rules; SASB CMBS cannot.
The short answer
Data centre ABS suits an operator with many leased buildings and a pipeline of more, because the master trust lets it add assets and issue new notes without building a new structure each time. Data centre CMBS suits a sponsor refinancing one large, stabilised campus or a defined portfolio, where the mortgage over the property and a loan to value test do most of the work. Many large operators use both.
Side by side
| Data centre ABS | Data centre CMBS (SASB) | |
|---|---|---|
| Issuer | Bankruptcy-remote issuer owning the data centres and leases, often under a master trust | Securitisation trust holding one mortgage loan to the property owner |
| Main credit | Lease cash flow from the pool, tested by DSCR | Property value and income, tested by loan to value and debt yield |
| Growth | New buildings added, new series issued, variable funding notes for acquisitions | Fixed collateral; new assets usually need a new loan |
| Rate and tenor | Mostly fixed rate, anticipated repayment date about five to seven years out, long legal final maturity | Often floating with an interest rate cap and extension options; fixed-rate deals also seen |
| If not refinanced | Step-up interest and a full cash sweep after the anticipated repayment date | Extension conditions, then maturity default if the loan cannot be repaid |
| Cash management | DSCR-based cash traps and rapid amortisation across the pool | Cash management triggers on debt yield and similar tests |
| US regulation | Qualifying structures outside Exchange Act ABS rules after the July 2026 SEC staff letter | Still Exchange Act ABS |
What decides the choice
- Portfolio shape. Many buildings and many tenants favour a master trust. One very large asset with a small number of hyperscaler leases favours a single loan.
- Funding plan. ABS works best for repeat issuers who expect to come back to market every year or two. CMBS is often a one-off refinancing of a specific asset.
- Rate view. Sponsors wanting fixed-rate, long-dated money tend to prefer ABS; those wanting prepayment flexibility or expecting a sale may prefer floating-rate CMBS.
- Tenant mix. Rating agencies apply tenant concentration limits in ABS pools. A single hyperscaler tenant can be easier to underwrite as one property loan.
- Regulatory cost. For US deals, ABS issuers that fit the July 2026 SEC letter avoid Regulation AB disclosure, ABS-15G and risk retention. That gap may push more qualifying deals towards ABS.
The view from London and Europe
European data centre securitisations have been rarer and have mostly taken CMBS form, secured on a small number of assets. Any European deal has to be analysed under the EU or UK securitisation rules, which turn on tranching of credit risk rather than the US definition. The SEC letter does not change that analysis.
Questions to take to the documents
- What exactly is the collateral: buildings, leases, land, power rights, or a mortgage loan?
- When is the anticipated repayment date or loan maturity, and what happens if the market is shut then?
- Which tests trap cash, and at what levels?
- Can assets be added or released, and on what conditions?
Read the full structure guides on data centre ABS and data centre CMBS, and compare trigger levels on the triggers benchmark.
Sources
- SEC Division of Corporation Finance, staff response on certain data center securitizations (29 July 2026): www.sec.gov
- Securities Exchange Act of 1934, section 3(a)(79) (15 U.S.C. 78c): www.law.cornell.edu
