The announcement comes days after bigger rival China Evergrande Group said there was no guarantee it would have enough funds to meet debt repayments.

It shows some developers continue to struggle even as Beijing has started to marginally relax financing to meet developers' normal funding needs.

Sunshine 100 said in an exchange filing that it was not able to repay the principal and interest of a 10.5% bond due Dec 5, "owing to liquidity issues arising from the adverse impact of a number of factors including the macroeconomic environment and the real estate industry."

The delinquency would also trigger cross default provisions under certain other debt instruments, the company said.

China toughened real estate curbs early this year, exacerbating debt problems at Evergrande and some other highly leveraged developers, triggering fears that their potential collapse could send shockwaves through the country's real estate sector and beyond.

Since October, Chinese regulators have urged banks to relax lending to meet developers' normal financing needs, and allowed more real estate firms to issue bonds in the domestic market.

(Reporting by Samuel Shen and Andrew Galbraith; Editing by Stephen Coates)