The informant is talking about folk beliefs she learned from her mother about houses in China:

“You shouldn’t buy a house that’s at the end of a T-street, cuz then all the bad spirits will go into your house.”

This reminds me of a similar practice I have heard of, I believe in Feng Shui.
This could also come from the fact that houses at the end of T streets are more likely to be run into by automobiles. It could also just be due to the fact that a house in this position may just be more visible.