Project owners are principally responsible for the project. They may not delegate this function of general interest, defined in Title II, subject to the provisions of this book relating to the mandate and transfer of project ownership, the provisions of Book II relating to partnership contracts, article L. 121-5 of the Highway Code and articles L. 115-2 and L. 115-3 of the same code.
The following purchasers are contracting authorities:
1° The State and its public establishments;
2° Local authorities, their public establishments, the public housing offices mentioned in article L. 411-2 of the French Construction and Housing Code for rental housing assisted by the State and built by these bodies and their groupings;
3° The private bodies mentioned in article L. 124-4 of the French Social Security Code, as well as their unions or federations;
4° Private low-cost housing bodies, as referred to in article L. 411-2 of the French Construction and Housing Code, and semi-public companies, for State-subsidised rental housing built by these bodies and companies.