SYDNEY--Australia's central bank left its benchmark interest rate unchanged for a 14th straight month Tuesday, saying that while a recent sharp fall in the Australian dollar would help the economy, the currency still remained overvalued.

"The most prudent course is likely to be a period of stability in interest rates," the Reserve Bank of Australia said.

The policy rate was held at a record-low 2.5% to cushion the economy against the end of a mining investment boom, a sharp downturn in commodity prices, and growing signs of a slowdown in China.

"The exchange rate .. remains high by historical standards, particularly given the further declines in key commodity prices in recent months," the central bank said following a policy meeting earlier in the day.

"It is offering less assistance than would normally be expected in achieving balanced growth in the economy," the RBA said.

The central bank has indicated it was prepared to keep interest rates low for some time yet as significant declines in unemployment are some way off.

The Australian dollar, which has fallen by 7% since early September, was little moved after the comments, trading in a tight range around US$0.8750.

The fall in the currency is largely linked to a strong rally in the U.S. dollar, but prices of important commodities such as iron ore have fallen by 13% in the past month, adding to a more-than-40% drop since January.

The central bank further highlighted growing risks posed by an investor-led surge in home prices centered on Sydney and Melbourne, noting rising lending to speculators over recent months.

Last week, the central bank said it was on course to unveil by year-end new measures to tamp down house prices, which have risen by more than 10% in the past year. The RBA has warned that the housing market has become unbalanced, with nearly half of all loans now being written for investors in the sector.

If Australia's central bank implements this so-called macroprudential policy, it would join its counterparts in the U.K., Canada and New Zealand, among others, that have moved to cool house prices.

Tim Lawless, head of research at property research firm RPData, said the trend in house-price growth remains solid. If investor demand for housing continues to stay strong, new lending clamps look unavoidable, he added.

Some nonmining sectors of the economy, especially housing construction, are in recovery, but unemployment has risen to its highest levels in a decade, stirring caution among policy makers.

Earlier Tuesday, the Australian Industry Group/Housing Industry Association Performance of Construction Index posted a 4.1-point gain for September, signaling the industry's strongest pace of expansion in nine years.

Write to James Glynn at james.glynn@wsj.com

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