Quote from matgallis:
The danger in borrow yen and repurchasing into a reit has several inherent dangerous.
1) Exchange rate risk - Yen is appreciating at a steady rate these last few years. Dollar won't be able to strengthen more without an interest rate hike. You may make 10% a year, but you're subject to could loose 10% in that year if you convert back to USD
2) Carry-Rate risk. The spread between you borrow rate and your investment return. If the rates increases, and rental property returns falls, you may produce a real negative return. Deflation in housing + inflation in other assets is common occurance world wide right now. Not sure if japan is experiencing these 2.
3) Riets are typically over-leveraged with little extra cash to protect their assets. If deflation in housing occurs you bet their profits will be squeezed.