Former Hong Kong leader Leung Chun-ying has challenged landlords to “adjust their mentality” over rental yields as he renewed his call for price cuts to stem a 40-year-high vacancy rate for commercial properties from rising further amid a slackening economy. Leung, now a top political adviser to the country, also warned that landlords would be harmed in the end if they refused to budge on lowering rents. “It is sheer self-delusion if landlords think they can get the rent level they want by...