530 B Street

530 B Street is a 27-story, skyscraper in San Diego, California.

History

Completed in 1969, for 20 years the tower stood as the tallest building in San Diego, until the completion of the Symphony Towers in 1989.The building was originally developed as a major banking and commercial office center and served as the headquarters for Union Bank, along with other financial and professional service firms. Its design reflected the International and New Formalism architectural styles common in large U.S. office towers of the late 1960s.
In 2014, Kearny Real Estate Co. acquired the property and undertook a $15 million renovation program that rebranded the asset as Five Thirty B. This overhaul included updated restrooms, a redesigned lobby with public art, a refurbished conference center, and the transformation of the third-floor patio into the 15,000-square-foot Sky Terrace with outdoor gathering spaces and landscaping, which helped boost occupancy from around 50 % to nearly 78 %.
In 2016, Vancouver-based Bosa Development purchased the building from Kearny, continuing its role as an office property in the competitive downtown market. Later, the tower changed hands again; in 2024, Ambient Communities acquired the building for approximately $27.5 million and announced intentions to explore a future conversion to primarily residential use as part of a broader repositioning strategy amid downtown office vacancy challenges, while U.S. Bank remained as a major tenant.