More than likely it is jointly titled, meaning there is no "half" to sell. It is an undivided interest, meaning you both have the same rights to the property as a whole. Not a great deal for a buyer.
This response is based on the limited facts presented and is not intended to substitute for direct legal advice, nor is it intended to establish an attorney-client relationship. It is intended to direct you to issues which you may desire to explore further.
More facts are needed. We would have to examine the lease and title. Best of luck - Reese Serra
This advise is only being offered as a courtesy. We do not have an attorney-client relationship and I do not represent you. Additional, the advice I have provided was based on the limited fact pattern provided by you. If the facts differ, my advice may not be correct. If you live in Michigan and would like legal assistance with your issue, feel free to contact me: 586-615-0756