Shanghai's house prices fell by 19.5% in the third quarter, says Savills, a global property company.
But restrictions on foreign buyers to purchase homes remain an obstacle, according to Savills.
Indeed, property specialist Savills estimates that 14, 646 units are being built or planned near the river.
In France lofty tax hikes have already been curbing high-end activity and suppressing prices, according to Savills.
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Savills defines its "new-world" category as Moscow, Mumbai, Singapore, Hong Kong and Shanghai.
Savills estimates prices fell 16.3% from March 2011 to March of this year.
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Real estate firm Savills, which marketed the mansion, confirmed the deal but declined to comment or provide further details.
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In Britain, the estate agency Savills has charted the inflow of money from the international super-rich into prime London property.
"We can't really see any evidence of a housing boom, " said Yolande Barnes, head of residential research at real-estate agent Savills.
Savills Auctions will sell off the London Victorian on September 20 in a non-distressed real estate auction to the highest bidder.
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The city is pricier than Singapore, London, Tokyo and Paris, Savills found.
Yolande Barnes, director of residential research at the Savills agency, is far more cautious, predicting 22% growth over the next five years.
Ms. Barnes, of Savills, says despite new fees and taxes that may curb buying activity, the wealthy will still invest in property overseas.
As recently as spring 2012, Savills found Hong Kong as the most expensive in a company survey, outranking Singapore, London, Tokyo and Paris.
After the developer failed to repay a loan, the bank involved - Deutsche Postbank AG - appointed Savills to re-market the entire site and project.
To tap this market, real estate agent Savills hired a Russian-speaker.
Melanie Bien, an advisor from Savills Private Finance, told BBC Breakfast she believed other banks may follow Abbey's lead in warning customers about excessive borrowing.
"People thinking of taking out a fixed-rate should not delay, but should move as quickly as possible, " said Melanie Bien, of mortgage brokers Savills Private Finance.
Nathalie Gamory, of Monaco Real Estate, an affiliate of the Savills agency, says that on Monaco's scale, a short distance can make a vast difference in price.
In 2012, Singapore's growth slowed to 5%, Hong Kong's growth stalled in the second half of the year, and London slowed noticeably in the second half, Savills noted.
Meanwhile, average prices in Savills' "old-world" category have ticked up.
According to Yolande Barnes, head of residential research for Savills, another high-end estate agency, movements in London property are closely aligned with those in the price of gold.
"Billionaire activity has been concentrated on high-end urban centers rather than leisure properties in the surrounding countryside or regional sunbelts, " said Yolande Barnes, head of world research at Savills.
Savills believes this inflow is the key reason why London property prices have gone on rising while the market in much of the rest of Britain is stagnant or falling.
Average leisure property prices in these cities grew by a mere 0.3% during the second half of last year, compared to 3.1% in the first six months of 2011, Savills' Leisure Property Index shows.
The share of residential housing stock owned by private landlords has jumped more than 40pc since the financial crisis, and now makes up almost a fifth of the total, according to estate agent Savills.
The math has changed in recent months and years, as government efforts to curb property inflation from the influx of foreign buyers have resulted in new fees and taxes, says Yolande Barnes, head of world research at Savills.
The report also looked at leisure resort areas -- like Cap Ferrat in France, Alibag in India and Phuket, Thailand -- which lag in values compared to urban properties but have the most potential for growth, according to Savills.
However, Richard Donnell, an analyst at Savills, points out that the rises in London property prices coincided with bumper years in the City, for the good reason that 40% of those that buy in the prime central London locations work there.
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