I haven't been here in ages, and just happened to be revisiting some cases today.
Quite some time ago, I purchased a book that contained interviews of Chinatown in the early 1970's. I really thought it was going to be helpful, as I found in the 1973 city directory that almost all of the Chinatown residents at that time were Chinese. I figured Rose might have stood out while living there.
I had difficulty locating most of the names, it seems the older generations tend not to be online. I tried contacting a few but was not sure if I had the right people and never got any reply. I also contacted a Chinatown Historical Society sort of website and asked if they could recommend anyone I could talk to, they did not respond either.
I did a google street view and went around Chinatown and really didn't see any big house like Rose had described. It's mostly apartment buildings or apartments that are above the storefronts.
There were a couple listings for "benevolent society" or "benevolent association" (I forget which) in the city directory that seemed to house a very large number of people, but all of the people had Chinese names. Perhaps these were some sort of homeless shelters in a large building and could be what Rose was referring to?