Staff at the Christchurch Central Police Station are expected to begin relocating to a new office within the next month.
In December last year, it was announced that police would move out of the 13-storey Hereford Street building they have occupied since 1973 due to the risk that continuing aftershocks may degrade internal services in the building.
District Commander Superintendent Gary Knowles told staff on Wednesday that it could be several months before all staff were fully relocated to new premises.
Mr Knowles says 400 staff need to be re-housed to an office which will be their base for the next five or more years until a permanent replacement station is built.
He says he has reassured staff and the public that the Hereford Street building remains safe.