Crime surveillance, food assistance, an 83-foot Christmas tree – they’re all being paid for by an increasingly influential coalition of San Francisco billionaires.

In the latest blurring of the lines between city services and private philanthropy, crypto billionaire Chris Larsen is chipping in for a monthly downtown block party featuring prominent DJs and a giant disco ball. The goal is to entice costume-clad revelers to help revive the city’s struggling financial district and counteract images of a blighted San Francisco.