Board Thread:Newbie Questions/@comment-25786043-20141224215229/@comment-2169718-20141229154100

Multi tool >> Remove is the way to sell stuff (when it works, it will confirm with a message "are you sure you want to sell it for xxx gold?" or give a warning of some sort.

It doesn't seem to work on farms anymore though (tested on PC, Firefox/Chrome). A bit of searching suggests that Social Point might have quietly removed the ability to sell farms, because some players sold/bought farms repeatedly, as a way to level up quickly.