Is it legal for Nanxiong Ding Yu Real Estate to refuse to pay the civil air defense management fee before the property contract expires?

Illegal. Nanxiong Ding Yu Real Estate Company violated the provisions of the national land law in the development project, and privately occupied some resources and interests that should belong to public income. Civil air defense management right is the security guarantee for communities and residents. Nanxiong Ding Yu real estate refused to deliver the right to manage civil air defense, which brought security risks and troubles to the community and residents. This is illegal.