By 1900, Chinatown covered the four square blocks bounded by Canton Alley (on the west), Hastings Street (on the north), Keefer Street (on the south), and Main Street (on the east, named Westminster Avenue at the time), with Pender Street (then called Dupont) as the main commercial district. During this time, Vancouver's Red Light district was present in the area, undergoing routine police checks and attempts to clean up; the area. By 1906, the Dupont brothels were forced to close. As a result, several brothels and businesses moved to two parallel dirt paved, dead-end lanes off of Dupont, West of Carrall: Shanghai Alley and Canton Alley. While these immigrants were dispersed throughout Chinatown, they strongly concentrated these areas. In 1896, the health officer for the City of Vancouver reported the city had to destroy houses in Chinatown "owing to their filthy condition" and that "one could hardly pass through the quarter without holding one's nose." Another health officer noted "The Chinese merchants and employers of labour endeavour to assist the health officials, and are, as a rule, willing to co-operate and help in this matter, but the lower classes of Chinese emigrants give a great deal of trouble unless constantly watched," concluding that continued immigration would lead to "circumstances and conditions which predispose to infectious disease, and serve to spread it rapidly when once it is roused into activity." This perception only worsened with the turn of the district. Residents of the area where said to face continuous "white hostility and discrimination" due to three main vices, drug problems, gambling and sex work. As these perceptions grew, the discrimination turned to violence, resulting in a destructive raid in 1907 that caused irreversible damage to the area.