A "Sole Proprietorship" or "General Partnership" seeking to operate in the County of Middlesex must file a Certificate of Trade Name with the County Clerk. The Middlesex County Clerk's Office stands ready to assist with recordation of real property ownership and transfer, and in retrieval of information.All owners of taxable personal property are required, annually, to file a Personal Property Declaration Form M15. Complete forms and filling procedures in real and personal property transactions, including the real estate settlement procedures act. A single personal property assessment is made for all taxable personal property of the owner located in the city or town. 2. We can give you some information from your case file. We can provide you with samples of court forms that are available. Use the free New Jersey Online Filing Service to file your 2024 NJ-1040 return. It's simple and easy to follow the instructions, complete your NJ tax return,. View complaints of Middlesex Management filed with BBB.