Exploring implications of an absolute physical address. FSF basically claimed a physical "domain name" and no future organizations will be able to reside in that address. FSF can move out and ask USPS to do a 301 Moved Permanently or 308 Permanent Redirect.

At my first job, we'd occasionally have old people showing up to pay their water bill (with checks, of course!) because 20 years previously, the local water utility occupied the same building that we were in. They were generally pretty upset because we had no idea where the water company was and they were paying in person because the bill was late, and their water could potentially be shut off.

they actually did move in the meantime :-) [1]

Can this redirection be forever?

> no future organizations will be able to reside in that address

You are supposed to put the name, no? "Some Organization, <old address>" would unambiguously refer to the new org.

[1] https://www.fsf.org/blogs/community/fsf-office-closing-party

ask USPS to do a 301 Moved Permanently or 308 Permanent Redirect.

The USPS doesn't honor either 301 or 308. As someone who moves just about every year, and fills out the paperwork to get my 301s and 308s for free, instead of paying a third-party service, I can tell you that the 301/308 at USPS is only good for one year.

To get around this, I used to use a 305: Use Proxy, but then my UPS Store of choice closed, and I was back to 301/308 land.