AI startup Elise AI announced on Tuesday that it has raised $350 million at a $4 billion valuation, double what it was worth when it raised its Series E last August. This latest round was co-led by Andreessen Horowitz and Bessemer Ventures. Elise AI, founded in 2017, automates administrative and operational work for housing and healthcare companies.

It said its software is used by 1 in 6 apartments across the country and announced this summer it passed $200 million in ARR. Earlier this month, Elise announced the launch of an AI “teammate” called Apollo that helps with tasks inside the Elise AI platform.

“It’s built natively into the same platform that already runs leasing, maintenance, and renewals,” co-founder and CEO Minna Song told TechCrunch. “So it can act across every role on a property team.” Elise AI also helps automate patient-related paperwork for specialty physician groups on the healthcare side.