I'm not an accountant but am in the same boat as you. The Co-op adds next to nothing to your filing. You'll get forms at the end of hte year from the management company and your mortgage company. The mgmt company will give you forms telling you how much of your maintenance paid went towards taxes and is therefore deductable and your mortgage company will send you a form with your mortgage interest paid. Hope this helps but you should defintely talk to a tax professional if you have very specific questions.