SHANGHAI, Oct 23 (Reuters) - China's blue chip index dropped to its lowest in over 4-1/2 years on Monday, with markets subdued due to the ongoing property crisis and lower chances of stimulus after a set of strong economic data, exacerbated by the Middle East conflict.

** China's blue-chip CSI300 Index hit its lowest level since February 2019 and was down 0.7% by 0258 GMT, while the Shanghai Composite Index fell 0.9%, touching its lowest level since late 2022.

** Chinese shares continued to drop, with the CSI300 down 4.2% last week.

** Multiple factors were in play including headlines around the export ban by the U.S., the widening Middle East conflict, and China's strong third-quarter economic data print likely being interpreted as leading to a lower likelihood of stimulus in the fourth quarter, UBS analysts wrote in a note.

** While regulators have introduced several policy tweaks to bolster market sentiment, Thomas Gatley, China strategist at Gavekal Research, argued that onshore markets face two problems that defy quick solutions: high global yields and the ongoing property crisis.

** Property sales remain weak and developers are under intense cash flow pressures.

** The U.S. enjoys the biggest yield advantage against China in 21 years, with the yield gap between China's 10-year government bonds and their U.S. counterparts at 226 basis points.

** Hong Kong market is closed on Monday for public holidays. (Reporting by Shanghai Newsroom)