What does MM SF mean?

Answer 1

I think MM is an abbreviation for milometer and SF is an abbreviation for square foot. This is usually applied when looking for places to rent according to what I read.

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NB: Those examples are in Upper-case, and as such, with the meanings given, might apply in the USA.

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Otherwise, mm in lower-case has only one meaning, as the standard, international abbreviation for the length unit, millimetre. (Not '~meter' as it is a French word!)

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The UK abbreviation for 'square foot' is 'sq. ft.', in lower-case.