Airbnb co-founder Joe Gebbia says he plans to donate $12.5 million to Rising Up to combat youth homelessness in San Francisco and the Bay Area, San Francisco Mayor London Breed announced Wednesday.

This generous donation will help the coalition house 145 young people and provide homelessness prevention services to another 105. The coalition aims to raise $35 million for those efforts, and Gebbia’s contribution brings the total to nearly $30 million, she said.

“This is a very significant investment that will go a long way to house young people experiencing homelessness and prevent more young people from falling into homelessness,” our executive director Sherilyn Adams said. “We’re thrilled.”