Coming by water
The proximity to water is an important part of the story of the birth of jazz. The “resorts” catered to sailors and soldiers with prostitution, which was legal and licensed in San Francisco until 1915. The dances that emerged in the district were designed to encourage these connections. Jazz was a euphemism for sex in the 19th century, leading to the connotation with the music which brought men and women dancing near each other.
Sources: Pioneer Urbanites by Douglas Daniels p. 147-160
“When they danced the turkey trot at the So Different” Jerry Schimmel, 2/24/1995 San Francisco Examiner
1887-1919 San Francisco City Directories
1910 Police chiefs memo listing resorts, cabarets, saloons, etc. that existed on Pacific St. during the years 1908-1910
“Jazz: the word and its extension to music: a reprise” by Peter Tamony unpublished manuscript 1968