Batsto State Park (NJ) still has a standing company store from an iroworks.
The Hopewell Furnace NHS also has a company store. But a great deal of the site
has been heavily restored/rebuilt. They have an extensive library on iron
sites. You might also want to check with Washington and Lee. They ahve been
working on the domestic structures associated with a number of ironworks in the
Shenandoah Valley . Try Katharine Stroh.
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I also have an extensive bibliography on iron reference material (70 pages or
so). If you want it I can try and send it.
Jamie Brothers