Regulator HQ

Regulator HQ is a house in the Capital Wasteland and the headquarters of the Regulators. It is the farm house located north of Wheaton Armory and west of Canterbury Commons. This location is given to you once you add the Lawbringer perk to your character.

Outside of the house are three brahmins, and inside are three Regulators. Sonora Cruz should be outside tending to the cattle, she may also be inside. It is entirely possible that she is no where to be found and you will have to go looking for her.

Glitches
It is unconfirmed whether it's a bug or part of the game, but approximately 4 out of 5 times you fast travel to the Regulator HQ (tested in Xbox 360 version), random enemies spawn whom kill the brahmin and then attack you. These attacks may cause Sonora Cruz to run away and disappear if she is outside of the building. (Cruz is important as she is who buys fingers off of you if you have the Lawbringer Perk)