Did you know Market and Walnut Streets used to be named Holladay Street after the Holladay family? This street was known nationwide as the wildest, most open, dissolute prostitution strip.
The Holladay family petitioned the city in 1887 to name the street something else, and they were successful.
The residents of the newly named Market street who lived north of 23rd didn’t appreciate being associated with the red-light-district moniker, so in 1899, this section of Market Street was renamed as Walnut Street.
Source: Denver Streets by Phil Goodstein (C) 1994 – see on Amazon