It depends if your rental activity is derived from a business where you are a real estate professional or not. If not, these are Passive Activity Losses that can only be offset by Passive Activity Income. If your activity level in the rentals did not change, then the passive losses were not taken in previous years until you reported passive income the loss could offset. You will see a PAL carryforward this year on your return.
For more information on losses and carryforwards see Publication 925.
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