Here you go Henry - found some info you might not know. :)
There is a former law office that closed in 2013 somewhere in Chicago (I don't know the location) that was bought by a company who only bought the property to use the site. In the bulding, they store three McLaren F1s (F1 #001, F1 LM LM2, and F1 #003) among other cars!!
Here is an image that was on CPCS a few months back but got randomly deleted. Looks like Chicago spotters on here will have a new group of cars to spot.
Would you by any chance know where this is?