In some cases, it is possible to deduct rental expenses if you have no rental income or experience a rental loss. A rental loss occurs when your rental expenses are higher than your gross rental income. The rental loss then be claimed against your other sources of income, but this situation may need to be verified when you file your income and expenses.
However, keep in mind that those deductions can only be made while the property is vacant but available to be rented. The deductions can cover the cost of maintaining the property while you wait to rent or sell it, but those deductions will not apply if the unit is not on the market.