Mary Sargent © 2008 …………………………………….. click to enlarge
Many apologies to those of you who depend on me to post every night. It was Verizon's fault. I'm thinking cable.
The boundaries of Chinatown keep changing because, unlike other neighborhoods, determined by geographic or historical associations, Chinatown is determined by the preponderance of Chinese businesses in the area, which obviously can expand (or contract, though it has not done that yet). Based on these two photos, I'm going with Wikipedia's declaring Broadway to be the western border.
See map.