Neither Snow nor Rain nor Heat nor Gloom of Night Stays These Couriers from the Swift Completion of Their Appointed Rounds

Not!

Your carrier is instructed not to attempt delivery when there is a heavy accumulation of snow or ice on sidewalks, steps or porches. If conditions prevent your carrier from reaching your mailbox, you may consider meeting the carrier upon delivery or arrange to pick up your mail at your local post office.

They sold the building with the inscription anyway.