Complex sentence: Addresses should be done in all-upper-case without punctuation, and the unit number may precede street number, with a hyphen, e.g., "27-1643 DUNDAS ST W" using the above example.
Split into simpler sentences: Addresses should be done in all-upper-case without punctuation. And unit number may precede street number, with a hyphen, e.g. "27-1643 DUNDAS ST W" using the above example.