Trump would push the sale to private companies who then will lease it back to the government at ripoff rates. Making his rich buddies even richer.
Australia sold government offices to private investors and leased them back under long-term agreements. Studies later found that the leases were more expensive in the long run compared to the costs of owning and maintaining the buildings.
The UK government sold public assets (including schools, hospitals, and office buildings) to private companies and leased them back under the PFI scheme. It resulted in higher costs for taxpayers due to inflated lease payments and maintenance contracts over decades.