The rating grades the lease. The buyer prices the shed.
If investment-grade data-centre paper needs 7%+ to clear, the credit index is no longer measuring where the AI buildout's borrowing costs actually are.
QTS Realty Trust sold $3.9bn of bonds to fund a Georgia data centre tied to Microsoft. The bonds carried high-grade ratings. They cleared at a yield of about 7.23%. Hold those two facts together. The investment-grade index option-adjusted spread was 79 basis points on 27 August, close to the tights of this cycle, and the ten-year Treasury was 4.67%. A generic investment-grade bond therefore yields somewhere in the fives. This one paid seven and a quarter. BlackRock's July financing for a Texas data-centre project, also high grade, went at about 7.53%. The gap is the part worth understanding. In these structures the rating largely reflects the lease: a long contract from a creditworthy tenant, secured on a specific building. The agency is grading a covenant. The buyer is pricing something else — what the asset is worth if the tenant does not renew. A data hall is a shed with a substation, a cooling plant and a single-purpose fit-out built for one customer's rack density. The residual question is not whether Microsoft pays. It is who leases it afterwards. The pipeline behind it keeps loading. Applied Digital is sounding out roughly $3.5bn of high yield for its Delta Forge campus in Louisiana; Goldman is marketing $800m for two Novva sites in Nevada; $1.085bn of secured notes for a CoreWeave-leased campus are expected to be issued through a financing vehicle affiliated with PowerHouse Data Centers and Chirisa Technology Parks. That is this site's thesis in one line. Risk is leaving the place where it is aggregated and priced in public, for deals rated one lease at a time. The index says 79 basis points. The deals say seven per cent. Both numbers are real, and only one of them shows up on a spread chart.