Commercial real estate bond issuers in Hong Kong and Mainland China will continue to face the risk of office oversupply, while resilient property portfolios, conservative balance sheets, and financing channels will be key factors supporting their investment-grade ratings, said rating agency Fitch.As tenants are increasingly seeking higher quality and Hong Kong's capital market continues to pick up, market demand for office spaces covered by issuers may be stimulated in the short term, Fitch added.Related NewsBofAS: NEW WORLD DEV (00017.HK) May Need to Conduct Debt Mgmt Operations; Uncertainty Remains on Parent Firm Capital Injection