Kaiser Center, Modernist skyscraper in Downtown Oakland, United States

Kaiser Center is a 28-story office tower at 300 Lakeside Drive in downtown Oakland, California, designed by Welton Becket & Associates of Los Angeles. Its broad curved facade faces left toward Lake Merritt, clad in a dense grid of rectangular windows between light-colored horizontal bands, with solid light-gray vertical panels at the edges and a wide solid section on the right. A lower rectangular building with large windows and a flat roof sits at its base.

The tower was completed in 1960 and was at the time the tallest building in Oakland. It was built as part of the city's postwar growth and for many years stood as the largest office complex west of the Rocky Mountains.

The rooftop garden, designed by Theodore Osmundson & Associates of San Francisco, was the first built in the United States after World War II. Edgar F. Kaiser commissioned it after the tower was designed, inspired by the gardens of Rockefeller Center. Legend places Henry J. Kaiser in a 28th-floor penthouse, though by 1960 he had moved his projects to Honolulu.

The tower stands at 300 Lakeside Drive, where Lakeside Drive ends and meets Harrison Street, bounded by 20th, 21st and Webster streets beside Lake Merritt. A three-story office and retail building adjoins the main tower. The rooftop garden, the first built in the United States after World War II, was added after the tower was designed.

The stone cladding is likely an exceptionally pure coarse-grained dolomite, probably taken from quarries in California owned by Kaiser. The rooftop garden, added after the tower was designed, was the first built in the United States after World War II, commissioned by Edgar Kaiser and inspired by the gardens of Rockefeller Center.