Ahhhhhhhh reminds me of "The Safe House" in Milwaukee, WS. Too many little "spy" things in there to list, but as an old Speakeasy you went in through a sliding bookcase and out through a phone booth.
Of course, there is NO sign saying Safe House anywhere on the building
Ferd
PS Props to someone who Does Know the name of the sign on the building
One free drink to someone who knows the alternate entrance