SAN FRANCISCO (KRON) — San Francisco City Attorney Dennis Herrera has filed a lawsuit against the developers of the Millennium Tower for not telling buyers that the tower was sinking, Herrera announced Thursday.

The 58-story luxury high-rise located at 301 Mission Street has sunk 16 inches and is leaning more than 6 inches since its completion in 2008.

Herrera claims that the developer, Mission Street Development LLC, an affiliate of Millennium Partners, knew that the tower was sinking and did not disclose this information to the buyers.

“Developers knew for at least a year that the tower was sinking much faster than expected,” Herrera said. However, they still proceeded to sell the condominiums.

More than 400 homeowners live in the tower, which could ultimately sink more than 30 inches.

The developers blamed the building’s excessive settlement on groundwater pumping at the neighboring Transbay Terminal construction site.

“Buyer beware doesn’t cut it here,” Herrera said.This story is developing. Stay with KRON4 News for updates