The AI building boom just became visible in cold concrete and steel.
The Census Bureau's August data show private data center construction spending hit a record annual pace of $84.95 billion, up 73% from $49.05 billion a year earlier. That's the fastest growth since April 2025's 88.2% jump, and it has accelerated for four straight months running. Data centers now make up 63% of all private office construction, versus 47% a year ago, while general office construction fell 9.7% to $45.8 billion. The gap between the two categories, $39.1 billion, is the widest since Census started tracking this series in January 2014.
Of the $8 billion monthly increase in private nonresidential spending, $5.9 billion, or 74%, came from data centers alone. Strip them out and nonresidential construction actually shrank 5.9% year over year. The industry's growth chart isn't showing a booming economy. It's showing one sector propping up every other one.
And this tally only counts the buildings, not the racks, servers, and GPUs going inside them, which are getting pricier by the quarter on AI demand. The real number is bigger than $85 billion, and nobody is counting it yet.