An incident on the third floor of the nine-story building at 455 Seventh St. occurred early that morning and damaged the floors below.
The building briefly reopened Wednesday morning but closed when it was determined that more work was needed to dry out the building.
Restoration efforts continued today and are expected to keep the building closed until Monday, police said.
Most employees are still able to enter and come to work, police said.
Police services usually offered at the administrative building, such as vehicle releases, fingerprinting and other appointments, will be temporarily offered at the Police Department's Eastmont substation at 2651 73rd Ave.
The substation is open from 8 a.m. to 3 p.m.