Mayor Ed Lee, Supervisor David Chiu, city librarian Luis Herrera and others attended a ceremony at the church Saturday morning.
North Beach residents celebrated the new library project with the help of the colorful performers of Beach Blanket Babylon and other musical entertainment.
Construction of the new branch library in North Beach is funded by a $106 million voter approved bond measure.
Furniture and equipment will come from the fundraising efforts by friends of the San Francisco Public Library.
