I think you better have a letter from your landlord. The letter will be significant to prove that you have been living together for more than a year.
I got PR as a common law partner of a canadian resident. I submitted the letter from landlord...because my partner moved into my apartment and the rental contract had only my name. Also, I talked to the landlord to add my partner’s name on the contract when we decided to apply for my PR status.
Rather than that, i sent lots of pictures, letters, Birthday cards, ferry ticket when we went trip to victoria...and letter from the back to prove our joint account. 6 letters from our mutual friends....i hope those info would help you.
横レスさんこんにちわ。
IMM5409のStatutory Declaration of Commo-law Union用紙の、①My Common-law partner and I: の中のd)Have declared our Common-law union under Canadian Income Tax Actです。
ここを、『YES』にしました。