Property fee income can be used as a source of repayment for construction enterprises.

What you are asking is why the income from property fees can be used as a source of repayment for construction enterprises. This can be used as a source of repayment for construction enterprises for the following reasons:

1. Long-term stable income: Property fee is one of the long-term stable income sources generated by real estate projects built by construction enterprises. Once the project is completed and put into use, the owner will pay the property fee according to the contract, which will provide reliable cash flow for the construction enterprise.

2. High predictability: Property fees are usually fixed or paid according to certain rules, which is highly predictable. Construction enterprises can estimate the income of property fees according to the unit area or contract of real estate sold, and make repayment plans accordingly.

3. Construction enterprises have property management rights: in some cases, construction enterprises can maintain property management rights for the projects they undertake. Construction enterprises can get extra income from property management services for repayment by repairing, maintaining and managing real estate by themselves or by entrusting professional property management companies.