On Sunset Boulevard you'll find a lot of shops but it seems Imagineers snuck in a subtle reference to a classic television show when they worked out the numbering system for the buildings.
Located on the building between Mouse About Town and Carthay Circle Theater, 77 Sunset refers to the classic television show "77 Sunset Strip", which was a detective drama that aired on ABC from October 10, 1958 through February 7, 1964.
You may think a street sign is enough of a reference for this TV show, but if you have keen ears, you'll also hear another reference. Heading in the oppositie direction, on Commissary Lane you'll hear a slew of classic ABC theme songs. You'll hear the theme to Roseanne, Doogie Houser M.D. and yes, 77 Sunset Strip.