No guns on federal property including the VA, Social Security Admin, IRS, FAA, FCC, SEC & post office. This includes parking lots unless the lot is shared such as in a strip mall. My local IRS leases space in an office park with many businesses so the parking lot is legal in that situation..
Post Office - 39 CFR 232.1
Veterans Administration - 38 CFR 1.218
Social Security Admin - ????????
Internal Revenue Service - ????????
Federal Avaition Administration - ????????
Security Exchange Commission - ????????
It really helps everyone if when you make a claim that something is illegal you provide an actual citation to the law that make it illegal.
Without something to reference we are stuck with a bunch of internet banter consisting of nothing more than "Yes, it's legal!" "No, you'll get put away in prison!" "I was told this!" "I was told something completely different!" "Nobody is sure what the truth really is!"
41 CFR 102-74 deals with Federal facilities that are under contract, i.e. the Social Security Office that is located in a commercial bulding not owned by the Federal Government.
Title 41: Public Contracts and Property Management
PART 102–74—FACILITY MANAGEMENT
Subpart C—Conduct on Federal Property
Applicability
§ 102-74.365 To whom does this subpart apply?
The rules in this subpart apply to all property under the authority of GSA and to all persons entering in or on such property. Each occupant agency shall be responsible for the observance of these rules and regulations. Federal agencies must post the notice in the Appendix to this part at each public entrance to each Federal facility.
...
Explosives
§ 102-74.435 What is the policy concerning explosives on Federal property?
No person entering or while on Federal property may carry or possess explosives, or items intended to be used to fabricate an explosive or incendiary device, either openly or concealed, except for official purposes.
Weapons
§ 102-74.440 What is the policy concerning weapons on Federal property?
Federal law prohibits the possession of firearms or other dangerous weapons in Federal facilities and Federal court facilities by all persons not specifically authorized by 18 U.S.C. 930. Violators will be subject to fine and/or imprisonment for periods up to five (5) years.
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Penalties
§ 102-74.450 What are the penalties for violating any rule or regulation in this subpart?
A person found guilty of violating any rule or regulation in this subpart while on any property under the charge and control of GSA shall be fined under title 18 of the United States Code, imprisoned for not more than 30 days, or both.
Nowhere does this address any prohibition on the carry of a firearm in the Parking lot of the "Federal Facility" as defined in 18 U.S.C. 930.
So, it is legal in any parking lot where the Federal Facility is not actually on Federally owned land.