The specialized book "The Use of Hybrid Financing Instruments in Public Private Partnership Models in the Construction Industry" offers a comprehensive analysis of the application of hybrid financing instruments in conjunction with Public Private Partnership (PPP) models. The thesis pursues two main objectives: Firstly, it examines the optimization of hybrid financing instruments concerning their usability in various PPP models, from both a liquidity and a business management perspective. Secondly, it presents an equity-equivalent financing alternative that enables a reduction in financing costs through the combination of PPP models and hybrid financing forms. The work is based on current literature as well as interviews with professionals to develop well-founded optimization proposals for a more efficient financing structure. The analysis includes international infrastructure projects and sheds light on the realization processes of PPP models to gain practical insights.