This large concentration of wealth was the basis of developing fine residences and ambitious architecture in the city; its Victorian neighborhoods reflect the gold years. The numerous miners also attracted the development of a thriving red light district. Among the well-known local madams was Josephine "Chicago Joe" Airey, who built a thriving business empire between 1874 and 1893, becoming one of Helena's largest and most influential landowners. Helena's brothels were a successful part of the local business community well into the 20th century, ending with the 1973 death of Helena's last madam, "Big Dorothy" Baker.