<sod>| built = 1836-1842 (East Wing and Central); 1855-1861 (South Wing); 1862-1864 (West Wing); 1867-1869 (North Wing)<ref name="nrhpinv2">{{Cite document|title=National Register of Historic Places Inventory-Nomination: United States Department of the Treasury|url=http://pdfhost.focus.nps.gov/docs/NHLS/Text/71001007.pdf |format=pdf|date=February 3, 1971 |author=W. Brown Morton III |publisher=National Park Service}} and {{PDFlink|[http://pdfhost.focus.nps.gov/docs/NHLS/Photos/71001007.pdf ''Accompanying five photos, exterior, undated'']|32&nbsp;KB}}</ref><eod>
<sod>| built = 1836-1842 (East Wing and Central); 1855-1861 (South Wing); 1862-1864 (West Wing); 1867-1869 (North Wing)<ref name="nrhpinv2">{{Cite document|title=National Register of Historic Places Inventory-Nomination: United States Department of the Treasury|url={{NHLS url|id=71001007}} |format=pdf|date=February 3, 1971 |author=W. Brown Morton III |publisher=National Park Service}} and {{PDFlink|{{NHLS url|id=71001007|title=''Accompanying five photos, exterior, undated''|photos=y}}|32&nbsp;KB}}</ref><eod>