This is something we have seen in British Columbia, especially in Vancouver. The federal government has land there and should be offering it first to francophones who need to build schools.
We had the same problem in the Northwest Territories in the 1990s. The federal government had a piece of land in Yellowknife, and a space was actually being sought to build a francophone community centre.
In part VII of the Official Languages Act, there should be an obligation for the federal government to offer its land for sale in priority to francophone school boards. This is similar to what is done in the truth and reconciliation process, where the federal government transfers land to indigenous communities to right wrongs. This is a very good principle, and I believe it is also applicable to the francophone minority, which needs land across Canada to build schools.