The Architecture of Managed Retreat

For some reason, BLDGBLOG's recent look at architectural partitioning reminded me of something from The Rings of Saturn by W.G. Sebald.
At one point, Sebald is describing the slow collapse of large manor houses as they fail to survive years of inadequate maintenance:

Keeping up the houses even in the most rudimentary way had long been impossible. The paintwork was flaking off the window encasements and the doors; the curtains became threadbare; the wallpaper peeled off the walls; the upholstery was worn out; it was raining in everywhere, and people put out tin tubs, bowls and pots to catch the water. Soon they were obliged to abandon the rooms on the upper storeys, or even whole wings, and retreat to more or less usable quarters on the ground floor. The window panes in the locked-up rooms misted over with cobwebs, dry rot advanced, vermin bore the spores of mould to every nook and cranny, and monstrous brownish-purple and black fungal growths appeared on the walls and ceilings, often the size of an ox-head. The floorboards began to give, the beams of the ceilings sagged, and the panelling and staircases, long since rotten within, crumbled to sulphurous yellow dust, at times overnight. Every so often, usually after a long period of rain or extended droughts or indeed after any change in the weather, a sudden, disastrous collapse would occur in the midst of the encroaching decay that went almost unnoticed, and had assumed the character of normality. Just as people supposed they could hold a particular line, some dramatic and unanticipated deterioration would compel them to evacuate further areas, till they really had no way out and found themselves forced to the last post, prisoners in their own homes.

(More Sebald: The birds and Bunker Archaeology).