this kind of information source mainly includes open information channels, market research companies, government departments, relevant experts, real estate and other related industries and field surveys.

1. Public information channels: including various media and network information.

2. Market research companies: professional companies can provide market data and competitor information.

3. government departments and relevant experts: government agencies and industry experts can provide policy information and professional advice.

4. Real estate and other related industries: Real estate developers and property managers can provide real estate information and lease conditions.

5. field investigation: field investigation can obtain first-hand information of the target location.