They are heading for the "old offices where a man's life sinks into peat".
It is hard to say how long it may have taken mice to find and settle into the old offices, but the old offices had giant windows, which could be opened to circulate air, which perhaps forestalled their arrival.
And those in Sam's old offices are quite familiar with him moving chairs and scratching at the door.
By the early hours of Friday, people were still clinging, it seemed, to the old offices in Rue Nicolas-Appert.
There are also models for Braille, musical notation and linotype, and photographs of old offices, toy typewriters and advertisements.
"Everyone wins, except the local treasury", says Kwong Lee, director of the Castlefield Gallery.But the fastest-growing use for old offices is as homes.
They are reviled by the right and were even kicked out of their lavish old offices on the House side by Republican leaders.
The first stop, up a set of stairs, was Belasco's old offices, a warren of ruined empty rooms with paint so distressed that it looked like mold.
The mirrors in the loos at The Independent's old offices made most of us look like Siberian peasants emerging from a gulag.
Distribution moved to bigger premises without first selling off its old offices and invested in a complex computer system that took ages to bring online.
The lawyers who conduct investigations are often former prosecutors or regulators themselves, sometimes coming back to negotiate with their old offices on behalf of new clients.
