engineering services and construction design activities with respect to the construction or improvement of family housing units in an amount not to exceed $4,418,000. 2203. Improvements to military family housing units Subject to section 2825 of title 10, United States Code, and using amounts appropriated pursuant to the authorization of appropriations in section 2204(a) and available for military family housing functions as specified in the funding table in section 4601, the Secretary of the Navy may improve existing military family housing units in an amount not to exceed $36,251,000. 2204. Authorization of appropriations, Navy (a) Authorization of appropriations Funds are hereby authorized to be appropriated for fiscal years beginning after September 30, 2017, for military construction, land acquisition, and military family housing functions of the Department of the Navy, as specified in the funding table in section 4601. (b) Limitation on total cost of construction projects Notwithstanding the cost variations authorized by section 2853 of title 10, United States Code, and any other cost variation authorized by law, the total cost of all projects carried out under section 2201 of this Act may not exceed the total amount authorized to be appropriated under subsection (a), as specified in the funding table in section 4601. 2205. Extension of authorizations of certain fiscal year 2014 projects (a) Extension Notwithstanding section 2002 of the Military Construction Authorization Act for Fiscal Year 2014 (division B of Public Law 113–66