" cannot be correct. " should be clear (or you can write the word in full, of course). 2) Yes.
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Roman Definer4) St. - British variant, isn't it?Isn't Str. American?In the US, the abbreviations are: St. (street), Rd. (road), Dr. (drive). Ave. (avenue), Hwy. (highway), Blvd. (boulevard) ...
GPY4. As far as I know, "St." is used in the US just as in the UK. Perhaps an American forum member could comment. If it's like other abbreviations, the British may be more inclined to omit the full stop.5. It's the other way around. "flat" in this sense is primarily used in the UK rather than the US. However, the word "apartment" is also understood by everyone in the UK.