Does Changchun have the latest policy of reducing or exempting property fees for vacant houses?

I don't know, the regulations vary from place to place, and many places have cancelled the regulations on reducing or exempting property fees for vacant houses. The reason is that you don't live and use for personal needs or reasons, so you can't escape the responsibility.

Just as you rent a house and don't live by yourself, you can't use this as an excuse not to pay the rent.