Street and avenue designations up to and including Tenth are often spelled out, especially when this helps to prevent confusion with the building number. However, it is best to use the official name of the street (whether Tenth or 10th) as designated by the municipality:
If the street name is written in numerals, modern usage tends to favour cardinal rather than ordinal numbers:
However, note that in a mailing address, Canada Post’s Addressing Guidelines call for use of an ordinal numeral:
In abbreviated form, apartment or suite numbers are written before the building number and are followed by a hyphen:
Identify floors of a building as follows:
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