What best describes a professional who can administer mortgages on behalf of others?

The term that best describes a professional who administers mortgages on behalf of others is "Mortgage Broker." A mortgage broker acts as an intermediary between borrowers and lenders, helping clients find suitable mortgage products by assessing their needs, taking their financial situations into account, and negotiating favorable terms. They have the expertise to navigate various lending options and can provide valuable insights into the mortgage process.

In contrast, a real estate consultant typically focuses on providing advice related to buying, selling, or investing in real estate but does not necessarily handle mortgage transactions. A loan officer usually works for a specific bank or financial institution and primarily provides loans and mortgage products to customers but is not an independent broker representing various lenders. An investment broker deals with investment products and securities rather than mortgages. Therefore, the role of a mortgage broker is specifically aligned with the administration of mortgages, making it the correct choice.