owning real estate with others can often times be a problem. unfortunately you are experiencing some difficulty. you cannot get someone to "sign off" the property unless that person is willing to do so voluntarily. having said that the co-owner can put up his undivided share as collateral , in this instance to secure an atty fee. you can start what in connecticut is called an Action in Partition. it can be and often is costly and time consuming. you should consult an atty of your choice immediately.