Police investigators are treating an overnight blaze at the Old Damascus College site in Ballarat East as suspicious.
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CFA crews were called out to the derelict buildings along Victoria Street about 9.10pm on Thursday, containing a fire that tore through a structure on the western side of the block.
Police remained guarding the scene on Friday morning as an arson chemist travelled to the site to investigate the cause of the fire.
In 2015, police investigated a series of suspicious fires at the same vacant block, which was also home to the old Ballarat Orphanage.