This site enables you to interact electronically with the Middlesex South Registry of Deeds. This site enables you to interact electronically with the Middlesex North Registry of Deeds.The legal boundary of a property is set forth in the deed(s) of the property. Below is a numerical list of the Probate Court forms available to the public. The Middlesex County Clerk's Office stands ready to assist with recordation of real property ownership and transfer, and in retrieval of information. In real estate transactions, a trust deed transfers the legal title of a property to a third party until the borrower repays their debt to the lender. Middlesex County Clerk's Office. Official Records Public Search. Fill in the blank form formatted to comply with all recording and content requirements.