1. project planning and supporting facilities: Tiantai tourmaline garden provides high-quality housing and luxury supporting facilities, large gardens, gymnasiums, swimming pools, private clubs, etc. The investment and maintenance of facilities will increase the project cost and also lead to the rise of house prices.

2. Geographical location: Chengyang District is a prosperous area of Qingdao, with good urban infrastructure and convenient transportation, and there are many supporting facilities such as commercial centers and schools nearby. The favorable conditions make the real estate price in this area very high.