This is what billionaires' houses cost in global cities

Though the global market is reeling under a slowdown threat, the ultra-prime real estate market of the world's billionaires has performed well throughout the downturn, according to a new study from the United Kingdom-based real estate firm Savills plc.

Price growth of high value homes has been highest in emerging markets like Singapore, where prices have increased 144 per cent since 2005 and Mumbai, where prices have jumped 138 per cent in the same period, Savills said.

Click NEXT to know about high-value property prices in various cities across the globe. . .

1. Hong Kong

• Price per square foot: $10,415
• Average property size: 5,200 square feet
• Price change from 2005 to 2010: 83%

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2. Tokyo

• Price per square foot: $8,068
• Average property size: 16,010 square feet
• Price change from 2005 to 2010: 11%

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3. Paris

• Price per square foot: $5,083
• Average property size: 10,760 square feet
• Price change from 2005 to 2010: 49%

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4. London

• Price per square foot: $4,803
• Average property size: 7,860 square feet
• Price change from 2005 to 2010: 38%

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5. Moscow

• Price per square foot: $3,917
• Average property size: 4,630 square feet
• Price change from 2005 to 2010: 110%

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6. New York

• Price per square foot: $3,528
• Average property size: 6,500 square feet
• Price change from 2005 to 2010: 26%

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7. Shanghai

• Price per square foot: $2,052
• Average property size: 5,380 square feet
• Price change from 2005 to 2010: 32%

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8. Singapore

• Price per square foot:$1,554
• Average property size: 12,300 square feet
• Price change from 2005 to 2010:144%

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9. Mumbai

• Price per square foot: $1,103
• Average property size: 6,790 square feet
• Price change from 2005 to 2010: 138%

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10. Sydney

• Price per square foot: $917
• Average property size: 19,380 square feet
• Price change from 2005 to 2010: 21%