Since you have property is Canada, you could not escape from being subject to Canadian taxation law. So, my previous posting is wrong.
However, your position is not so bad. The priority for you is to become US taxation resident. If you meet the criteria of that, then you are the US resident. Because of that, you have to be non-Canadian resident, according to treaty. Actually, you do not need to tell CRA this detail. Just simply use right form for non-resident. Residency is a matther of election at this stage.
Because you are non-Canadian resident, you should only include Canada sourced income in CRA return, which means you do not need to include your US sourced income. If you do not have any Canadian reportable income, you even do not need to file CRA return.
However, your position is not so bad. The priority for you is to become US taxation resident. If you meet the criteria of that, then you are the US resident. Because of that, you have to be non-Canadian resident, according to treaty. Actually, you do not need to tell CRA this detail. Just simply use right form for non-resident. Residency is a matther of election at this stage.
Because you are non-Canadian resident, you should only include Canada sourced income in CRA return, which means you do not need to include your US sourced income. If you do not have any Canadian reportable income, you even do not need to file CRA return.