Authorizes the Hawaii Housing Finance and Development Corporation (HHFDC), at the request of the Hawaii Community Development Authority (HCDA), to establish and operate transit-oriented development infrastructure improvement zone subaccounts within the dwelling unit revolving fund for the benefit of infrastructure improvement projects within a transit-oriented development infrastructure improvement zone. Requires HCDA to develop a transit-oriented development infrastructure improvement zone program to foster infrastructure development by strategically investing in public facilities. Requires the executive director of HHFDC in collaboration with the executive director of HCDA and Hawaii interagency council for transit-oriented development to conduct a study examining the current infrastructure of a transit-oriented development infrastructure improvement zone and the requirements necessary to upgrade the infrastructure to facilitate future transit-oriented development. Appropriates funds to HCDA for staff necessary to develop and manage the transit-oriented development infrastructure improvement zone program.