The Bizigune Programme was launched by the Basque government in Spain in 2013 to detect empty homes and help their landlords rent them through a social housing programme.
It relies on landlords reaching out to the regional government to say they have an empty home.
Definition of "empty home" in this programme:
The home is not part of the social or otherwise regulated housing stock.
It's empty, meaning it hasn't been lived in for the last three months.
It's not rented nor has it any limitations that prevent it from being rented.
Summary from their site through Google Translate:
Bizigune aims to attract unoccupied apartments for their entry into the market through protected rental.
Its purpose is to give uninhabited housing a social use, facilitating access to decent housing at affordable prices. It is intended for people whose economic resources are not sufficient to access the free market.
The owner of an empty house makes it available to ALOKABIDE (Public Company of the Basque Government, https://www.alokabide.euskadi.eus) through a usufruct contract in exchange for a series of established guarantees. In turn, ALOKABIDE will award this home to an applicant registered with the Basque Housing Service ETXEBIDE (https://www.etxebide.euskadi.eus) who will pay ALOKABIDE a rent proportional to their income.
Keywords: Basque Country, Euskadi, Spain, unused, vacant, dwelling