Marc Ganzi closed a $4 billion sale of his data center business to SoftBank Group and immediately began warning allocators that the AI infrastructure build resembles the late 1990s fiber overbuilding cycle. The comparison arrives as capital commitments to hyperscale data centers pass $80 billion for 2024 alone, with delivery timelines stretching into 2027.

Ganzi's firm specialized in powered-shell facilities leased to hyperscalers under long-term contracts. SoftBank's acquisition price valued the portfolio at roughly 14x forward EBITDA, a premium that reflects the Japanese conglomerate's conviction that GPU compute demand will sustain triple-digit growth. Ganzi walked with proceeds and no earnout structure, a detail that matters when the seller starts drawing historical parallels to infrastructure collapses.

The 1990s fiber reference is specific. Between 1996 and 2001, telecommunications firms laid over 80 million fiber-optic miles across North America, funded by $500 billion in debt and equity. Utilization rates never exceeded 3% before the market corrected. Ganzi's concern centers on the gap between data center capacity under construction and signed lease commitments. Industry data shows 18 gigawatts of new capacity announced in the past 18 months, but hyperscaler leasing activity has only absorbed 6 gigawatts of that pipeline. The delta represents speculative builds betting on future demand that may not materialize at projected pace.

The timing of the warning matters more than the warning itself. Ganzi exited at a valuation peak, transferring execution risk to SoftBank just as power procurement timelines extend beyond 36 months in key markets. Utility interconnection queues in Northern Virginia and Phoenix now stretch past 2028, creating a mismatch between developer promises and grid reality. The overbuild risk concentrates in secondary markets where developers chased lower land costs but face longer permitting cycles and thinner hyperscaler demand.

Allocators should track three sequences. First, lease absorption rates across the top 15 data center markets through Q2 2025. If the gap between announced capacity and signed megawatts widens past 12 gigawatts, the Ganzi thesis gains material support. Second, hyperscaler capital expenditure guidance in January earnings. Any moderation in Meta, Microsoft, or Google's infrastructure spending would accelerate the supply-demand imbalance. Third, debt refinancing schedules for private data center operators. Most developers used construction loans with 24-to-36-month terms, and the first major refinancing wave hits in mid-2025. Covenant breaches will surface if lease-up rates trail underwriting assumptions.

SoftBank now holds the execution risk on $4 billion of assets in a market where the seller just compared conditions to the worst infrastructure overbuild in modern history.