How much land do you own when buying a townhouse?

I have been looking at townhomes as well. Don't have an answer to your question but based on my understanding and research would assume they may appreciate a bit better than apartments, as they're more family friendly and can't build as many of them.

here in calgary townhouses pretty much all have condo fees and are not freehold... so you don't actually own land...

The answer to your first question is:
for a strata titled development, you do not individually own the land your unit sits on (nor any adjacent areas designated for your exclusive use).
You just have a unit share in the ownership.

Your link is to a freehold titled townhome, which is not so common in BC.
But I think the freehold distinction relates more to the absence of rules and cost-sharing for exterior maintenance as opposed to the legal ownership of the land on which the structure sits.

Someone from Ontario with more familiarity with this form of townhouse ownership can correct me on that if necessary.

Here are some things to be aware of with freehold title: http://www.lowermainlandliving.com/blog ... ments.html