"...No federal agency can sell anything unless it's uncontaminated, asbestos-free and environmentally safe. Those are expensive fixes.
Then the agency has to make sure another one doesn't want it. Then state and local governments get a crack at it, then nonprofits — and finally, a 25-year-old law requires the government to see whether it could be used as a homeless shelter.
Many agencies just lock the doors and say forget it...." More [BJS]