See the frequently asked questions from Suffolk Credit Union in Long Island, NY. Visit us online for a list of our FAQs and contact us for more details. Download application forms for accounts and services, get information about credit union fees and more from Suffolk Credit Union in NY. Explore online.Combined Real Estate Transfer Tax Return and Credit Line Mortgage Certificate. In this topic, you'll learn: Elements of a typical purchase offer. Why just about everything is negotiable at the closing stage. Suffolk's normal business practice to purchase and replace the items as a group. Note: This form must be downloaded to your device in order to be filled out properly. It must be opened in Adobe Acrobat Reader. I am looking to buy a house in the town of Huntington that has an extension to the back of the house that is roughly 15ft x 22ft.