Everything labelled "Main Street Stouffville" should probably be changed to "Main Street". "Main Street Stouffville" isn't a real thing according to Canada Post.

Thornloe boundaries aren't defined right

It doesn't appear the semantics of the addresses here are correct. Instead of giving the service roads names, the address interpolates here should be removed, and these buildings should either be split into individual buildings with addr:unit, or addr:flats should be applied to them.

Everything labelled "Main Street Markham North" should be changed to "Main Street North". "Main Street Markham North" isn't a real thing according to Canada Post.

These "apartments" are actually closer to townhouses. They may need to be split up, or nodes may have to be placed within them for the addresses to be searchable

The bridges in this area are approximate, survey required for better accuracy.

TODO: add addr:flats to these buildings

Albemarle boundary (relation 12390306) makes no sense

This construction zone requires an open date

Is this service road actually a part of "Nelson Street"?