Zhai's family owns 24 homes, though at one point, they owned 31 homes before selling seven of them, according to the task force.
Zhai's case was exposed after a whistle-blower used his microblog account on December 26 to accuse Zhai of engaging in corruption for personal gain.
The microblog also said Zhai's daughter owns 11 affordable housing units and she has two residence permits, even though individuals are only allowed one residence permit in China.
However, the task force said its investigation showed that none of Zhai's 24 homes were classified as "affordable housing."
The local public security department found that both Zhai and his immediate family members, including his wife, son and daughter, have two residence permits each, according to earlier reports.
More details about the case are forthcoming, said an official with the task force.
Railway staff members express Spring Festival greetings