Housing Cooperatives

Many cities in Europe are being subjected to the pressure of speculative real estate investments, and citizens are being thrown out of their homes, either by eviction or through offers of unaffordable lease contracts. Speculation is spreading to the suburbs of major cities, such as mine — Lisbon — and lease contracts there, are also raising sky high.
My idea is to create Government funded housing cooperatives, where people in need of a new home may register. The project would entail an initial investment for buildings restoration/ and or renewal, either partially or fully funded by the government, and the opening of a credit line in the name of the cooperative, to cover for the government initial investment, which installments would be paid through the collection of the members affordable leases, after they sign their new home lease contract.
There are a few gaps on the idea.
Would it be possible for our governments to fully fund the initial investment, to be collected later, after members sign their contracts? There has to be some private parties’ investment to partially cover for the initial investment, right?
People still having to pay for their current leases, could not possibly afford to pay for that credit line installments before signing the new affordable lease contract.
I would appreciate your feedback.

Leonor Marques