THE see-saw property market that is Perth, may be set for another battering.

A week after a controversial super-tax threatens to end many West Australian mining projects, comes news office rents in the city have collapsed 27.4 per cent over the past year.

Average rents are now $696 per square metre, per annum, according to CB Richard Ellis, which issued the report on occupancy cost drops across 176 global markets.

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