Template tags for user levels

So I am getting this set up and I was hoping I could access the level of the user that owns the sub site (blog) being displayed. So for example in the sub site’s theme, I would like to display certain things depending on the user level of the person that owns that blog. So I may show ads on a blog owned by a free user but not on one when the owner is upgraded to a payed account. Anyone got a code snippet for testing against the user level of the blog owner?