Which document utilizes legal title to real property as security for debt?

The document that utilizes legal title to real property as security for debt is the mortgage. A mortgage is a legal agreement between a borrower and a lender where the borrower provides the lender with a secured interest in real property as collateral. This arrangement allows the lender to have a claim against the property should the borrower default on the loan. In essence, the property acts as security for the debt, and the lender holds a lien on the property until the debt is paid off.

In contrast, a contract is an agreement between parties that can involve various types of obligations but does not specifically use legal title to real estate as security for debt. A deed is a document that transfers ownership of property but does not entail a loan or security interest. Lastly, a lease pertains to the rental of property and does not involve securing a debt; instead, it outlines the rights and duties of both the landlord and tenant without the implication of a loan secured by the property itself.