The AI buildout needs staggering amounts of capital, and a growing share of it is coming from investors willing to take on speculative grade risk for a fat coupon. Data center developers are increasingly turning to high yield bond markets to finance construction, pledging future rent from AI tenants as the collateral behind the deal. One recent example: a data center project leased entirely to a single AI cloud company raised over a billion dollars in junk bonds yielding north of 9%, nearly three percentage points above comparable rated debt, to fund a facility that won't generate a dollar of revenue for years. That structure captures the core tension in this corner of the market. Investors are underwriting construction risk, single tenant concentration and a multi year gap before cash flow even starts, all on the bet that a young, not yet investment grade AI company keeps paying rent once the lights turn on.

Finsum: When AI infrastructure gets financed with junk bonds backed by a single tenant's future rent, investors aren't really pricing the building, they're pricing whether that AI company still exists and still needs the space years from now.