You have to own six properties to be able to swap a high-valued one for a cheap one and have the difference sent to your player’s account balance. You can’t sell a property in GTA Online without acquiring a new one. Unfortunately, there is no way to do this. How to Sell Property in GTA 5 Without Buying a New One Confirm, and the difference in the value will be transferred to your character’s bank account automatically.
To do the swap-sell, you have to have the maximum of six properties you’re allowed in the game. Technically, you aren’t selling a property in this way, but it’s the closest thing there is to exchange one for money.
The properties will swap, and the difference in value will be directly transferred to you. So, what you can do is select a high-valued property and trade it for the cheapest one on the market at the moment. The closest thing you can do is swap it for a different one.