You can only claim a Terminal Loss on your property if you have been taking Capital Cost Allowance (CCA) on it and you have a positive Undepreciated Capital Cost (UCC) balance after selling/disposing of the building.
Since residential properties generally grow in value rather than depreciate, selling a rented house usually doesn’t result in a Terminal Loss. Instead, you may have a Recapture of CCA, which means that your leftover UCC is added to your income, and becomes taxable. This TurboTax Tip has more information on CCA: Dos and Don’ts: CCA for Rental Property Explained
Before taking CCA on your rental property, it’s strongly recommended that you talk to a tax professional to discuss if it would be beneficial or not.