LIVERMORE -- Ellis Partners has bought two office buildings in Livermore and one in Pleasanton in separate transactions, the realty investor and developer said Thursday.

San Francisco-based Ellis bought a 145,000-square-foot, two-building office campus just north of Interstate 580 on North Canyons Parkway in Livermore. The deal for the two buildings, known as North Canyons Tech Park, was arranged through realty brokerage HFF.

Ellis also bought a 64,000-square-foot office building known as Franklin Corporate Center, located at 5100 Franklin Drive in Pleasanton. The deal was arranged by commercial realty firm Colliers International. Ellis will undertake a major renovation of the Pleasanton building, including new lobbies.

Purchase amounts for the deals weren't disclosed.

"Both projects present the opportunity to reposition and re-lease newer, high-quality, well-maintained, and well-located properties in the improving Tri-Valley market," Ellis executive Jason Morehouse said.

Contact George Avalos at 925-977-8477. Follow him at twitter.com/george_avalos.