"Our policy, banning people would apply to everybody, regardless of how much money they have or what country they come from.
"We don't see any benefit to people who are not citizens or permanent residents of this country being able to speculate in housing and make a profit at the expense of generation rent."
The review would not affect the controversial case of Paypal co-founder Peter Thiel, a donor to the Donald Trump presidential campaign, who was able to gain citizenship and buy multiple Kiwi properties after spending a total of 12 days in New Zealand.
Thiel told the then-National Government he did not intend to live in New Zealand, but would be an "ambassador" for the country overseas and provide contacts for Kiwi entrepreneurs to Silicon Valley, The Guardian reported.
The decision to allow Thiel citizenship was ministerial, rather than policy, though Twyford said his party was "very critical" of the previous Government's decision.