Link to article in today's San Francisco Chronicle -
Commentary on keeping the facades..
article has additional images to this one -

photo credit - SMWM architects
Start of the article here -
SAN FRANCISCO
Classics preserved -- or are they?
In a changing city, vintage buildings often must adapt or get out of the way. Gutting them while leaving the facades intact at least allows for partial preservation.
John King, Chronicle Urban Design Writer
Wednesday, September 20, 2006
Depending on how fervently you believe in the sanctity of aged buildings, 150 Powell St. and 50 Oak St. in San Francisco are either triumphs of preservation or hollowed-out abominations.
At each address, the outer walls are as fresh as when they were erected nearly a century ago. But the look of a restored landmark is deceiving: Nearly everything behind those walls is brand new.
This sort of architectural sleight-of-hand isn't new to San Francisco or other large cities wrestling with how to grow in a way that doesn't include erasing all that came before. And the Bay Area is about to see one of the most ambitious -- or impudent -- examples yet when a mall that includes a Bloomingdale's opens on Sept. 28 behind the old Emporium facade on Market Street.
Many preservationists scorn the technique known as facadism as an insult to history. But a visit to the projects on Oak and Powell streets shows that partial salvation can be its own reward as long as you accept it for what it is: the display of souvenirs from another era.
end quote, more to article
Personally, I like the concept of retrofitting old buildings by keeping facades or other segments of old buildings and providing for contemporary usage by rebuilding much of the inside - as opposed to demolitioning a building - given that the building is of architectural interest in the first place, and given that keeping it as it is except for refurbishing won't work.
At least I think that in a city like San Francisco, which has such a developed sense of place.