Selling property often depends on the state of the market, but there are other factors to consider.
Depending on how you structure your duplex property this can make it easier or harder to sell. While you can sell a duplex separately, it is better to sell the sides together.
Selling off the sides independently will be harder than if you sell both sides together as a pair. This is because many buyers seek to purchase a duplex with the intent of making use of both sides. They generally either seek to rent out both sides or live in one and rent the offer.
By selling only one side, you significantly decrease the number of interested buyers and make it tougher to sell.