The Middlesex County Clerk's Office stands ready to assist with recordation of real property ownership and transfer, and in retrieval of information. This valuable resource serves as a treasure trove of information, providing a comprehensive insight into real estate documentation within Middlesex County.You don't need an original deed to sell or refinance property. You can obtain a copy from the Registry of Deeds or download it from our on-line site. This site enables you to interact electronically with the Middlesex South Registry of Deeds. Middlesex County Real Estate Attorney. Guiding buyers, sellers, and owners through attorney review, purchase and sale, closing, leasing and ownership. If you do not find your deed in the list of recorded deeds, it may be registered land. Middlesex South Registry of Deeds, Cambridge, Massachusetts. Middlesex South Registry of Deeds.