To sell Bricks you must list them for sale, making them available for other investors to buy. To list your Bricks for sale, you need to click into the particular property you wish to sell. You can do this from the Properties page or through your Portfolio.

Then simply click the Sell Bricks button, specify the number of Bricks and the sale price per Brick.

Please note that the sale price must not be more than 20% lower than the latest Brick valuation.
If you used Poli recently you will only be able to sell Bricks once the funds transfer has cleared, which normally takes 2-3 working days.
Once you have placed a sell order you can view and manage your sell orders at anytime by going to the "Pending Orders" section of your account.