SHANGHAI/SINGAPORE (Reuters) - Chinese stocks extended a blistering rally on Monday with those in the mainland headed for their best month in almost a decade, as Beijing rolled out further stimulus measures to arrest a slowdown in the broad economy.

Benchmark indexes in mainland China began the week on a solid footing after clocking their best weekly performance in nearly 16 years on Friday, with the CSI300 blue-chip index last up more than 6.22%.

The Shanghai Composite Index jumped 5.7%, while Hong Kong's Hang Seng Index rose 3.34%.

Shares of property companies rose sharply in response to China's central bank late on Sunday saying that it would tell banks to lower mortgage rates for existing home loans before Oct. 31, as part of sweeping policies to support the country's beleaguered property market.

Adding to efforts to reverse the property downturn, Guangzhou city announced the same day the lifting of all restrictions on home purchases, while Shanghai and Shenzhen eased curbs on buying.

"The market is still surprised by China's policy support and momentum is still continuing," said Kenny Ng, strategist at China Everbright (OTC:CHFFF) Securities International in Hong Kong.

Mainland-listed property stocks advanced 6.4%, while the Hang Seng Mainland Properties Index charged 8.4% higher.

Shares of consumer staples last traded 7% higher. The smaller Shenzhen index soared 8.2%.

For the month, the CSI300 index was eyeing a gain of more than 18%, its best performance since December 2014. The Shanghai Composite Index was similarly on track to end September with a 14.8% increase, its most since April 2015.