The Middlesex County Clerk's Office stands ready to assist with recordation of real property ownership and transfer, and in retrieval of information. You can search for property records and property ownership information online, in person, or over the phone with a 311 representative.This site enables you to interact electronically with the Middlesex North Registry of Deeds. For example, a multiple function document would be a discharge releasing a mortgage and an assignment of leases and rents with two distinct books and pages. Welcome to the County Clerk's Property Records Online Public Records Search Page. Middlesex County Courthouses. Welcome to Nassau County Land Records Official Records Search. Find and download various legal forms, brochures, and self-help kits. If a form does not open, right-click the link to save it to your computer.