Short answer: Government buys up to 25% with you. You pay 4.5% annual rent on their share. Can buy them out later.
The government buys up to 25% of your house with you. You own the rest. You pay rent on their share at 4.5% per year. When you sell, they get 25% of the sale price. You can buy out their share later. It helps if you can afford mortgage repayments but cannot save a big deposit.
House Price: $800,000
Your Share: $600,000 (75%)
Government Share: $200,000 (25%)
Annual Rent: $9,000 (4.5% of $200,000)
Monthly Rent: $750