CBO analyzed the condition of roughly 20,000 buildings that the active Navy (excluding the Navy Reserve and the Marine Corps) uses and maintains on its bases in the United States. For that group of buildings, CBO estimates that the cost of eliminating maintenance backlogs and raising the condition of the buildings to the Navy’s standards would be $17 billion (in 2020 dollars), and renovating and modernizing the buildings within their current footprint to fully support their users’ missions would be an additional $32 billion. On average, completing those buildings’ maintenance and their renovation and modernization would cost nearly half as much as replacing them altogether.