Which of these activities can the owner of a life estate NOT do?

A life estate holder can sell their interest in the property. While they cannot transfer ownership beyond their lifetime, they can sell their life estate to another person. The buyer then becomes the new life estate holder with the same rights, subject to the remainder interest. This transfer is legally permissible and commonly done in real estate transactions.

A life estate holder can mortgage their interest in the property. They can use their life estate as collateral for a loan, though lenders may be cautious due to the limited duration of the interest. The mortgage would only encumber the life estate portion, not the remainder interest that passes to the remainderman upon the life tenant's death.

A life estate holder has the right to lease the property during their lifetime. As the person with present possessory rights, they can enter into lease agreements with tenants. However, any leases cannot extend beyond the life estate holder's natural life, as the remainderman will take possession upon the life tenant's death.