; (B) carrying out activities, including administering the grant programs under the Housing Innovation Act of 2018 , to encourage partnerships in exploring and developing innovative solutions to the challenges to housing supply referred to in subparagraph (A); (C) coordinating with other offices within the Department, including the Office of Housing, the Office of Policy Development and Research, and the Office of Community Planning and Development, and other Federal agencies, including the Department of Transportation, to recommend policies that address workforce housing needs; and (D) providing technical assistance to local governments in undertaking or preparing for planning and policy reforms to increase housing units and housing supply diversity. (4) Detailees The Secretary shall ensure that the staff of the Office of Housing Innovation includes, at all times— (A) two detailees from the Department of Transportation, who shall include— (i) one having expertise in transit issues or active transportation issues, or both; and (ii) one from the Build America Bureau having expertise on the Transportation Infrastructure Finance and Innovation Act (TIFIA) program and the Railroad Rehabilitation and Improvement Financing (RRIF) program; (B) one detailee from the Environmental Protection Agency having expertise on the public health impacts of housing and community development