Warehouses are abandoned buildings that have no real use after obtaining, but can be replaced. They often have food stored in them, making it effective to scavenge from.
Their appearance is three gray-brownish long houses with a net fence in Rebuild and Rebuild 2, but they have been left out on mobile versions.
Scavenge the warehouse before reclaiming it,-- it will offer a better chance to find gears,weapons and food supplies.
In Rebuild you can change the building into a Hospital and a School. In Rebuild 2 you can change this building into an Apartment, a Bar, Hospital, School or Laboratory.