was curious of where this place was to put things in perspective and good old google allows you to get a good idea.

1st is a map showing LA etc and to the right is a pinkish / orange balloon with A in it which is Banning Airport
2nd is an aerial shot of the property - appears to be a few other sheds there for expansion as in the spooky interview said these were being rented out at the moment, big carpark and parkland for the accomodation
3rd is a drive by shot to confirm it is the place

18 000 square foot = 1 672.254 72 square meter  ( by google)

I don't think 18000sf is right its way bigger then that .

Your right Ant I multiplied where I should have divided, need another bullet  , and size doesn't sound right as that is only 33 x 50m space