
Buying a duplex, meaning a two-unit home, has the potential to be a lucrative real estate investment. In the right market, you can buy the duplex, live in one unit, and rent out the other, using that rent money to cover the whole mortgage.
If all goes well, you can essentially get free housing for yourself while potentially earning an investment return from any rent that exceeds the mortgage costs as well as gains in the underlying value of the properties.