Instead of the normal three-month period, they have a year to sell and will not be referred for criminal prosecution.
A further 462 cases are under investigation, Hockey revealed.
"I expect more divestment orders will be announced in the not too distant future," he said.
The Treasurer urged others to come forward before the November 30 cut-off, saying he will introduce tighter ownership rules into parliament during the next two weeks.
They will include tougher civil penalties, which will see investors lose the capital gain made on the property, 25 per cent of the purchase price or 25 per cent of the market value of the property.
"Australia's foreign investment policy for residential real estate is designed to increase our housing stock, but those who break the rules and purchase established property illegally are doing so to the detriment of all Australians," he said.
AAP