Basil's Flat is a location in The Great Mouse Detective. The home of Basil, it is located at 221 1/2 Baker Street, in a mousehole below the home of Sherlock Holmes at 221B Baker Street. When Olivia Flaversham loses her father and meets Doctor Dawson, the two travel to the flat to try and enlist his help in the matter. Image:Stub.png This article is a stub. You can help Disney Wiki by [ expanding it].