Is buying a duplex or penthouse good for investment?

This asset type can work well when the property is in a strong and scarce location and when the buyer is prepared for a longer hold or a targeted luxury audience. However, the buyer pool is smaller, resale discussions may take longer, and fit-out or operating costs can be higher.
If your goal is practical rental yield and faster liquidity, a conventional apartment may be the smarter investment.
If your goal is distinction and premium positioning, a duplex or penthouse can make sense.