Thank you very @storiesoferne for your comment. If, I will try to publish the possible solutions of rehabilitation, there are several options to rehabilitate and repair, what happens is that studies must be done, to determine the degree of damage of the building, since there are areas where the steel of the slab, has a high degree of corrosion, which causes a decrease in the resistance of the element, you must make tests and determine the degree of damage, study for its possible solutions.
Yes, that's understandable. A thorough inspection of the said building is definitely required and will take some time to investigate. Let us know when the available solutions are ready. Thank you for this!