BTL exchanged through Divorce

In 2000 my then Wife purchased a buy to let property for £100,000, in 2011 as part of our divorce settlement the property passed to my ownership with a value of £155,000. it continued to be let out. I am now thinking of selling that property what value should I use as my purchase value.

Hi peter Phillips,
Unfortunately, we are unable to provide specific advice tailored to individual circumstances on this forum. This forum is for general queries only and is intended to help you self-serve.
Please see the guidance available at: 
Tax when you sell property: What you pay it on and Tax when you sell property: Work out your gain.
If after reviewing this information and still require assistance then please use Capital Gains Tax or seek professional advice.
Thank you