CULT: Liberating Irises in Dead of Winter?

Greetings.
 
I posted earlier about a clump of an historic rebloomer which I've been  
watching for several years. It is located against a brick apartment house here  in 
town and once bloomed in December, looking fine. My walk yesterday reveals a  
situation such that a girl's thoughts turn to larceny. Bluntly, they are  
renovating the building for condos and it is a construction site. They  
apparently power washed the front late last week with some mildly  caustic solution, 
they've been walking all over the vegetation, meaning  this iris and a couple of 
boxwoods, they are pitching morter and  cinderblock chips around, and 
whatnot, and such. 
 
So, speaking hypothetically, if one obtained such a rhizome, how  would one 
treat it at this  time of year? Around here, as I said  earlier, 1 October is 
thought to be the last good transplant date. We have been  very cold so that 
I'd expect it to have gotten hit pretty hard in any case,  since most things 
did, but a mild week is forcast. 
 
Mainly I'm wondering about whether it should be left outside after  it is 
potted, or kept in the basement, which is about 50 and darkish. I  know to expect 
aphids and such and am reluctant on that score to put it in the  coldframe. 
Been there!
 
Thank you very much.
 
Anner Whitehead
Richmond VA USA USDA Zone 7, Urban 

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