The corridor was closed after a 7.1 magnitude earthquake struck the city in September 2017.
The director of Mexico's tourism promotion fund and the president of the country's premier public research university signed an agreement under which the latter contributes technical and sociological support to the project.
The Brazilian state also wants BNDES' help in structuring PPPs.
Hundreds of military engineers have been deployed to the military base to carry out site-marking activities.
The head of the country's highway authority said that some of the road programs planned for the current administration will have to be scratched if financing can't be secured.
The public works ministry said construction at Felix Bulnes hospital has fully resumed following Astaldi's exit.