Confidential documents reveal the SRL was estimated to cost $37 billion. A new tax was proposed on all homes across metropolitan Melbourne to pay for it.

Confidential documents reveal the SRL was estimated to cost $37 billion. A new tax was proposed on all homes across metropolitan Melbourne to pay for it.

The minister overseeing the project says it has been “refined”, but can’t explain why the estimated cost is $4 billion less than projected six years ago.