Updated 10/06/11 – 3:55 p.m.

CHICAGO (CBS) — Between 50 and 60 Chicago Fire Department personnel will be moving from their offices at a high rise on the IIT campus in Bronzeville to the Chicago Police Headquarters down the street.

Sources said the Fire Department will be moving out of its rented offices at 10 W. 35th St. at the Illinois Institute of Technology and into vacant office space at Police Headquarters at 3510 S. Michigan Av.

The move does not mean that either police or fire department personnel will be doing double duty for both departments, sources said.

The move should save the city about $30,000 a month in rent and should take place by the end of the year.

The Sun-Times reported that the move was discussed as far back as when former Mayor Richard M. Daley was still in office.

Once the move is completed, Police Headquarters likely will be renamed the Chicago Public Safety Building, according to the Sun-Times.

The current Police Headquarters building opened in 2000, replacing a 72-year-old building at 1121 S. State St. that also housed the Central District police station.