Meta Rosemount is an operational AI data center hosting an estimated 216k H100-equivalent chips — supported by 178 MW of IT power — at a capital cost of $6.7 B. We estimate that it uses Nvidia B200 chips. The timeline of IT power and compute capacity is based on satellite imagery, our cooling equipment power model, structural similarity to known buildings, chip availability, and chip efficiency. The campus sits on 280 acres of former University of Minnesota UMore Park land.