Had lunch with the Auntie that knew the founder of Yang Sing and has been to all the locations of Ynag Sing.
Started at Powell and Broadway.
Moved to Broadway and Stockton as it got better and they need the space.
Then to Battery for a larger location to be near the business district.
Finally to it present locations. Moved further and further away from Chinatown.
She did not remember when they started to close.