Public policies are collections of principles that guide state government actions in a given domain. The aim of public policy used by the state Housing Fund for distributing social housing facilities in Slovenia is to ensure transparent and equally fair treatment of all beneficiaries. During the last decade the Fund has established a sustainable structure for policy models that consist of three parts: written requirements for applications, a detailed process description, and a comprehensive decision support model containing rules for ranking the applications according to their priority. In this paper we analyze the main causes of changes in the policy in the last decade and investigate how they are reflected in the underlying conceptual and decision support models. The results of our analysis indicate that the key critical success factor was to maintain a delicate balance between the sustainability of the models and changes in the policy. As a result, the state housing Fund was able to leverage the supply on the Slovenian housing market by efficiently conducting twelve consecutive tenders for offering apartments under favorable terms to citizens.