ANSWER: Building in the photo--with the main channel of Los Angeles Harbor in the background--is the San Pedro Chamber of Commerce at 820 S Beacon St., San Pedro. Building was originally a Carnegie library and, once upon a time, served as San Pedro's temporary City Hall. Photo was made from roof of U.S. Post Office and Customs House.
ANSWER: Yep, it's the Islander, the municipal ferry that shuttles back and forth between San Pedro and Terminal Island across the main channel of Los Angeles Harbor.