In a heat map of economy sectors which are running hot, the ratio of investment by real estate firms to gross domestic product (GDP) turned "red", a signal that the property market was overheating, the central bank said.
"The increase in real estate firms' investment has been accelerated by urban redevelopment projects by major real estate developers," it added.
"In some limited commercial areas in central Tokyo, transactions in the higher price range have been increasing," it said, adding that developments in the real estate transaction market "continue to warrant close monitoring".
Japanese banks could also face risks from the rising possibility of interest rates remaining high overseas, it added.
But credit costs could rise abruptly, particularly for loans to Asia, if overseas interest rates stay higher for longer, it warned.
Persons:
Kim Kyung, Banks, Leika Kihara, Kim Coghill, Clarence Fernandez
Organizations:
REUTERS, Bank of Japan, Bank, U.S . Federal Reserve, Thomson
Locations:
Tokyo, Japan, TOKYO, Asia