Is Sino-business Joint Construction and Development Group Co., Ltd. a state-owned enterprise?

Yes According to official website, China Merchants United Construction Development Group Co., Ltd. is a state-owned enterprise. Sino-business Joint Construction and Development Group Co., Ltd. is a first-class enterprise of commercial network construction and development center of the State Council State-owned Assets Supervision and Administration Commission established on the basis of China Mining Joint Investment Group (the first international mining investment fund approved by the National Development and Reform Commission).