The buyers, Mr.Ito says, sometimes pay for their US$1 million condos with suitcases full of yen, hoping to collect rent while socking their money away overseas.

• Yukihiko Ito说，购房者有时候会带着装满日圆的手提箱来支付价值100万美元公寓的购房款，这些购房者希望能收租金，同时将资金放到海外。