The second step of the strategy is to verify if the gaps detected are "atrizables", that is to say, if they have the minimum requirements to accommodate, in a temporary or definitive way, residential units of inclusive repopulation. The suitability of each space will depend on multiple factors.
First, it will be necessary to estimate the number of residential units that the selected urban vacuum is capable of accommodating. This estimate will make it possible to assess whether the subsequent economic or management efforts required to obtain the land are cost-effective or excessive.
Secondly, it will be necessary to verify that the eventual filling of each void does not affect the quality of the urban fabric and that it will not generate any justifiable rejection in the social fabric. To this end, it is possible to contemplate the possibility of establishing a dialogue with the neighborhood through information and participation tables.
At the same time, it will be necessary to make a forecast of the legal, economic and constructive feasibility of the action.
Concerning the legal feasibility, it will be necessary to verify that the landfill does not contradict any ordinance or urban regulation.
With regard to economic viability, in the case of landfills on private land, monetary or species compensation ceilings - for example, the rehabilitation of the façade or the installation of a lift - must be established in negotiations with the owners.
In the case of constructive viability, consideration should be given to whether the width of the vial is sufficient for the handling of prefabricated elements or, in the case of reassemblies, if the bearing capacity of the base is sufficient.