Input Credit of GST on Maintenance Bill of Office

I have a office which is used for business purpose of mine. The office is in the joint name i.e in my name &
wife name. I recieve the maintenance bill of my office in my & wife name in which GST is levied. I am registered in GST but my wife who is the co-owner is not registered as she only holds a title in office.
So will I get the full input credit of GST on maintenance bill or only Proportionate credit as wife is unregistered in GST ?