millennium tower sinking skyscraper san francisco crackPedestrians inspect cracks near the sinking Millennium Tower in San Francisco, California.Beck Diefenbach/Reuters

Millennium Tower in San Francisco is still sinking and leaning.

But there’s finally a bit of good news for residents of the luxury building at 301 Mission Street, which has sunk 17 inches and tilted 14 inches since it was completed in 2008.

Engineers have proposed a fix for the tower’s troubles. They want to drill hundreds of steel and concrete “micro piles” (a type of foundation shaped like a pillar) into bedrock, in order to stabilize the tower and prop it back upright, according to the San Francisco Chronicle.

The retrofit could cost between $200 million and $500 million, which is more than it cost to build the $350 million skyscraper more than 10 years ago.

Though an inspection by the city in 2017 showed that Millennium Tower is safe to occupy, the situation has motivated some people to bail out. Residents say they’re selling their homes short of what they paid for them, with about 100 condos falling $320,000 in value on average.

Here’s what we know about Millennium Tower.