I purchased a site for e550,000 in 2008 and spent E300,000 building 4 apartments on the front 2/3rds of the site. I then sold the rear 1/3rd which was not developed for e145,000. The market value of the remaining part of the site including apartments is about e680,000. I'm trying to work out the cost allowed for the portion I sold for CGT. I came up with e149,393 giving me a gain of e4,393 ((145,000/(680,000+145,000))*(550000+300000)-145,000) but I've been told i cant include the building cost as 'enhancement' cost as they did not apply to the section sold and my gain is e48,333 ((145,000/(680,000+145,000))*(550000)-145,000). Are enhancement costs allowed in this case? Any help would be great