Built in 1904 in the Hungarian Secession style, the Post Office housed mail, parcel, telegraph and telephone services and equipment.

[2] The rise of mail volume, as well as the introduction of telegraph in 1850 and a public telephone system in 1887,[3] created a pressing need for a new post office building.

[1] The construction in a 3,950-square-metre (42,500 sq ft) building site in Jurišićeva Street began in 1903, and the new General Post Office started its work on 12 September 1904.

The sabotage was executed by three postal employees who managed to smuggle explosives into the strictly guarded building, and plant them in the switchboard during the night shift.

The resulting damage caused significant disruption of international telephone service and required an extensive repair.