Data Center Atlas Intelligence LayerSignals are concise, sourced changes captured as data-center projects, power, policy, and local conditions evolve across the Great Lakes.
Permitting
Grayslake · Lake County
T5 Chicago IV clears its first construction permit
What changed
Grayslake issued the initial building permit on September 1 for the first structure at the T5 Chicago IV campus. Site work for the first approximately 800,000-square-foot building can begin while a separate lawsuit challenging the earlier approvals remains pending.
Changed Sep 1, 2026 98% confidence 2 public sources
Why it matters
The first building has moved from an approved campus plan into an executable construction phase. The permit is a stronger delivery signal than another announcement, although the court challenge remains a live entitlement risk.
Watch next
Visible site mobilization and foundation work · later building permits · utility and wetland approvals · the next court status hearing