How often is the property grade in Lanzhou audited?

1 year. Lanzhou, referred to as "Lan" or "Gao", was called Jincheng in ancient times. It is the capital of Gansu Province, the center of politics, culture, economy, science and education, and an important central city in the western region. Lanzhou real estate grade is reviewed once a year. Lanzhou is located between east longitude 102 36' ~ 104 35' and north latitude 35 34' ~. Lanzhou has a temperate continental climate.