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You have up to three years after the cessation of your business to sell any associated business assets which in your case is the premises. See under "Disposal of assets following cessation of your business" here for confirmation.The amount of the gain you make on the disposal of the property which is charged to CGT at 10% may be restricted if you received rent at any time after 5 April 2008. See example 4 here.
The first £11,100 of gains you make in any one tax year are exempt from CGT.