In this paper, we investigate the impact of exploiting the public transportation network, jointly with freight urban modes, to leverage last-mile delivery in the context of Hyperconnected City Logistics (HCL). HCL proposes the usage of public transportation to provide efficient combined freight and passenger transportation. Our contribution is threefold. First, we propose a formal description of the operational problem when mobility and freight networks are interconnected. Second, we propose a mixed-integer programming formulation for the problem. Finally a case study built for the city of Bordeaux, France, is used to validate our proposal, and assess its economical and ecological benefits for the city stakeholders.