Hi Russ,
I would suggest that it really depends on your goals. Do you want to be a landlord? If you're planning to keep one unit after 5 years, why not keep both? Mortgage pay down should be sufficient after 5 years, along with appreciation, to allow you to refinance and pull out some equity for repairs/renovation or the downpayment on a new property. But also, you need to know what's keeping the vacancy rate so low in the town (assuming it's Nelson)? Will you be able to maintain the two sides for 5 years without having to put your own money into it? Are the older unit and the cabin/shop rented out with good long term tenants or at least occupied again shortly after move-out? If your research tells you the areas going to maintain a low vacancy, you have no tenant problems, your going to be in the area for a while (assuming your doing PM yourself), hold on to both sides until you foresee a time when the vacancy rates not going to be so high or when your ready to pull out some equity through the sale of one side. Have you asked other Canadian investors @ http://myreinspace.com/public_forums/forums/61-General_Discussion.html
Sorry to babble on but there are a lot of ?s...