I know it's not the right year, but...
Illustrated London News
Saturday September 28th 1867
Middle Row Holborn
"The unsightly and inconvenient block of buildings, mostly in an indifferent state of repair, which have hitherto obstructed the great thoroughfare of Holborn, just opposite the entrance of Gray's Inn Lane, are now being removed"
Wonder if this is around where those two houses collapsed..??