TexasCHLforum.com

The federal offices might be the excuse, but it doesn't wash by either Texas or Federal law. The possible exception is if the building is owned or leased by the federal government and the county offices are sub-leased from them. Even that would be highly questionable, because federal law only addresses places where federal employees actually work.

The federal law banning firearms in "federal facilities" (18 USC 930) defines "federal facilities" as "A building, or portion of a building, where federal employees regularly perform work."

For instance, if a USDA inspector has an office in a meat-packing plant, his office is a "federal facility", but the plant itself is not.