That’s still going to be a second residence, it may not be a $2500/month residence, but it’s not going to be free.

I think you’re confused by my original reply, I wasn’t saying it should be free or that they could just drive from their primary residence. I was saying that using the cost of DC housing as a reason for higher pay doesn’t make sense when they don’t have to live in DC itself. It’s perfectly reasonable that they may have to have a place outside of DC and commute in.

So, while there isn’t a rule that says specifically “congresspeople may not sleep in their offices”, there are all kinds of rules about what constitutes housing in DC that are not met by congressional offices:

Part of the issue is that you’re applying normal rules to an abnormal group. Traditionally I would agree with you that people shouldn’t sleep in their work offices, but this is hardly the weirdest thing that is normal in Congress. Also it doesn’t really matter if it meets the fire code or DCs building standards, Federal law has priority over local law. Even the DC Fire Code specifically says that it does not apply to any building or premises owned by the US Government.

Heck, there are a ton of special laws which Congress has passed which only apply to Congress, including prohibiting DC local government from charging property tax or income tax on Congressmen. There are even laws regarding allowances that Congressmen get which essentially says that there are quantifiable benefits of the job which cannot be counted as income for taxes.

The only rule that matters is whether Congress has specifically blocked it.

EDIT: I just double checked and the DOB link you sent says at the very top

“The Department of Buildings (DOB) is mandated to ensure public health, safety, and welfare by enforcing property maintenance codes on all residential and non-residential structures in the District of Columbia, excluding federal government buildings.”