Shinbashi [新橋] is often called "Salaryman Town" for an obvious reason - no matter what time of day you are there, you will always see a load of salarymen in the area.
Ever since the Edo Period, Shinbashi has always been a lively bustling town. When the first railway line opened for service in 1872 (Meiji 5) between Shinbashi station and Yokohama, the area became even more popular.
After World War 2 when Japan was scarce in resources, Shinbashi became a black market which was called "a place where one could get their hands on practically anything."
One of the reasons why there are a load of salarymen in the area is not only because there are a load of office blocks nearby, but also because there was a need to provide good cheap food and an outlet for salarymen to relieve their stress - Shinbashi became the place to cater for the salarymans needs and today is jam packed with a load of restaurants, izakaya (Japanese pubs), hostess bars and places where you can get a "massage."
Map of the area below.