According to the Canada Revenue Agency (CRA), A Capital Gain/Loss can only occur when something has been bought and then sold. Since you are renting out the apartment, you probably still own it and haven't sold so you don't need to declare any capital gain. However, you need to report your rental income (Minus Expenses) as a 99% owner on your return, and your spouse would report their rental income (Minus Expenses) as a 1% owner along with their portion of the payments/earnings.
For Capital Gains information, check out: Canada Revenue Agency (CRA) - Capital Gains
As well as: Canada Revenue Agency - Reporting Rental Income
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