Social rental housing projects have emerged since 2016 to cover the housing demand of low-income groups, but these projects need high cost that beyond the financial capacity of some governments. Therefore, the World Bank reports in 2014 and 2018 pointed to the importance of including the private sector in low-income housing projects as a real estate developer instead of the state.

The contribution of private sector and his successful experience in this field help in reducing the government spending towards these projects and achieving high quality in their implementation. For these reasons, many countries at international level involved the private sector in construction of social housing units in exchange for a set of incentives, which vary widely from one country to another.

These incentives are classified into two main groups, the first one is financial and administrative incentives such as providing free land or selling it at low price, besides taxes and financing facilities as applied in Brazil, China, Singapore and Thailand.