Twenty-third Street was a street in New York City. This street intersected with Fifth Avenue. This street was located in Manhattan.
In The Big Good-Bye, the master criminal Silent Forrester was chauffeured along this street to Fifth Avenue. His taxi was being tailed by Detective Jim Tierney and his squad. (TNG: "The Big Goodbye")
The pages seen in the episode are from the detective novel, The Listening Man, by author John A. Moroso. This novel was published in 1924.