The Los Angeles City Hall was used for several scenes in the movie.

Die Hard 2 (1990)

Die Hard 2 (sometimes referred to as Die Hard 2: Die Harder) is a 1990 American action film and the second in the Die Hard film series. The film was directed by Renny Harlin, and stars Bruce Willis as John McClane. The film co-stars Bonnie Bedelia (reprising her role as Holly McClane), William Sadler, Art Evans, William Atherton (reprising his role as Richard "Dick" Thornburg), Franco Nero, Dennis Franz, Fred Thompson, John Amos, and Reginald VelJohnson, returning briefly in his role as Sgt. Al Powell from the first film.

• http://en.wikipedia.org/wiki/Die Hard 2
• Gordon, W. A., 2002, The Ultimate Hollywood Tour Book, North Ridge Books, Lake Forest, CA, 272 p.