Trust your Middlesex property management to CMS Property Management. Here you'll find answers to the most frequently asked questions, downloadable forms to help you manage your lease, and essential telephone numbers.As a full service Middlesex property management company, our team is responsible for taking care of all aspects of managing your rental(s). We are a national property management company with local property managers serving all types of communities. Fill out the form and we will be in touch. Make a maintenance or customer service request through our resident portal. Residents can login to our portal to submit requests online. Fill out the form below and we will be in touch. Want immediate help? 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.