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In the Marais, where many expats now live, it is 12, 000 euros per square metre.
BBC: Living in: Paris
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In the lndo-Pacific Ocean, for example, there are as many as 1000 species per square metre.
UNESCO: MEDIA SERVICES
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Currently, the average housing price in Berlin is 2, 000 euros per square metre.
BBC: Living in: Cities known for art and culture
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The average cost of a three-bedroom apartment in the city centre is 9, 000 renminbi per square metre.
BBC: Living in: Great cities for history and ancient ruins
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Its success in this area capitalised on the fact that, compared with clothes, food generates high revenues per square metre of floor space.
ECONOMIST: BUSINESS BRITAIN
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Russian buildings leak energy like sieves: they use 425 kilowatt-hours per square metre a year, compared with 135 in Sweden and 120 in the United States.
ECONOMIST: The time-bombs of Tomsk
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They recommend a minimum floor area per bird, in enclosed housing, of 0.026 square metres per kilogram - a maximum stocking density of 40kg per square metre.
BBC: RELATED BBC SITES
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Building costs are around 500, 000 Chilean peso per square metre.
BBC: Living in: wine regions
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The city has the greatest number of teams (about 400), all non-paid and voluntary, and the most races (more than 20 a year) in the world per square metre.
BBC: Hong Kong: The birthplace of modern dragons
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The estimate is based on having two people per square metre, and takes into account limits on the number of people in venues like nightclubs, according to ABNT rules.
BBC: Could Brazil's club fire have been avoided?
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Communal showers, changing-rooms and saunas are perfect breeding-grounds for the highly infectious fungi that spread foot and nail infection: up to 1, 500 fungally infected skin fragments per square metre have been found in some leisure facilities.
ECONOMIST: Fancy footwork