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California  + Bay Area  + Office  | 

OpenAI Inks Mountain View Lease with KKR REIT, TMG Partners

KKR Real Estate Finance Trust Inc. (KREF) and TMG Partners made it official Monday, announcing the lease of 350-380 Ellis, a Class A campus in Mountain View, to OpenAI. The five-building campus spans 450,000 square feet.

KREF selected TMG in 2024 to reposition the campus into a future-ready workplace for leading global technology companies. “When we took ownership of 350–380 Ellis, we saw the opportunity to apply the full breadth of KKR’s real estate capabilities to create long-term value in one of the world’s most important technology and growth corridors,” said Matt Salem, KREF CEO and head of real estate credit at KKR.

He continued, “We believed this institutional-quality Class A campus would resonate with a forward-thinking, high-growth company. We are pleased to welcome OpenAI to the property. Executing a full-building lease in under two years underscores the asset’s positioning and our disciplined approach to value creation.”

Newmark’s executive managing director Jon Mackey, vice chairman Mike Saign and executive vice chairman Phil Mahoney represented ownership in leasing negotiations. JLL’s Mike Ino, Jon Moeller, Dan Johnson, Rich Duff and Bridget Fahey represented OpenAI.

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About Paul Bubny

Paul Bubny serves as Senior Content Director for Connect Commercial Real Estate, a role to which he brings 16-plus years’ experience covering the commercial real estate industry and 30-plus years in business-to-business journalism. In this capacity, he oversees daily operations while also reporting on both local/regional markets and national trends, covering individual transactions across all property types, as well as delving into broader subject matter. He produces 7-10 daily news stories per day and works with the Connect team and clients to develop longer-form content, ranging from Q&As to thought-leadership pieces. Prior to joining Connect, Paul was Managing Editor for both Real Estate Forum and GlobeSt.com at American Lawyer Media, where he oversaw operations at both publications while also producing daily news and feature-length articles. His tenure in B2B publishing stretches back into the print era, and he has served as Editor in Chief on four national trade publications. Since 1999, Paul has volunteered as the newsletter editor of passenger rail advocacy groups (one national, one local).

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