On June 3, 1958 — Los Angeles voters, in the largest turnout for a non-presidential election (62.3%), pass “Proposition B,” supporting the previously agreed-upon contract between the Dodgers and the city. The result of the referendum, which removes a significant hurdle for Walter O’Malley to build a modern stadium in the Chavez Ravine area, is approved with the final margin of victory of 25,785 votes.

Source
Baseball Reference June 3