Yes, you can, if you own the building (which you say you do) and the mortgage note is secured by the building.
The IRS lets you deduct your mortgage interest if
- The loan is secured, which means the lender has some kind of guarantee of payment, usually in the form of property. If a borrower defaults on payments, the lender can seize the property that’s securing the loan. If you’re buying or refinancing a home, especially if it’s your first home, the loan is usually secured by the home you’re buying or refinancing.
Additional information:
Where do I enter income and expenses from a rental property?
