No I don't, floor space per person seems to be one of those things that's barely registered or studied, it seems, on an international level. Some municipalities/cities do their own studies, and some organisations (EU, OECD) etc do run some country-level averages, but even here definitions are non-standard (e.g. they'll look at floor area per dwelling per capita, but definitions of dwellings range from houses to caravans to vacation homes and may include or exclude vacant dwellings etc, some count all area including outer walls, others count not the balcony, some count the balcony for half), but comprehensive solid international data that's standardised and available down to a local (city) level I'm not aware of. It's a shame because it's definitely interesting data! Who knows there may be a market for this kind of information :)