Was this house your primary residence for "at least" 2 of the last 5 years you've owned it? When you sell it in 2019 (if you sell it) will it have been your primary residence for at least two of the last 5 years you would have owned it, counting backwards from the closing date of the sale? Your response will dictate my answer which will be what I believe will be best, legal and safest for your specific situation.
