Option 1:
Regulate private landlords out of the market increasing home ownership above 80% crashing the economy making NZ a less desirable place to live.

Option 2: Increase OCR, LVRs, DTI,pricing landlords and first home owners out of the market creating a genuine class society.

Option 3:Let the free market reign having no restrictions ,landlords cannibalize themselves pushing down rents giving choices and options for renters and first time home buyers.

Option 4: A steady increase in regulation, a capital gains tax on unrealized gains, building compliance to meet green house emissions. An eventual buy out by government leaving a fully state controlled housing market.