I understand what happened here today, but what the heck happened in 2007?

35 Lauder Lane has sold for $2.3 million. Given its condition — updating urgently needed — but excellent location and property, that seems a reasonable price. But these owners paid $4 million for it in 2007, to sellers who had in turn paid $2 million for it in 2000. From $2 to $4 back to $2. There was some remodeling done between 2000 and 2007, but certainly not approaching any sum that would justify such a bump.