Visador Road
Unfortunately we couldn't get very much information on the old company that used to operate here, but we do know this: Visador manufactured and marketed specialty building products for the home construction industry, such as prefabricated doors. This street is still called Visador Road, even now that the business has long since closed.
What we did find down here (aside from a hiding place!) was a new company that operates through all hours of the night, so be on the lookout for a few muggles while you are hunting this cache. They most likely won't pay much attention to you, as they completely ignored us and we were there looking for a great hiding spot for about an hour. We feel we found the perfect place to make your mind really go to work, while keeping you out of heavily trafficked areas so you can take your time if you need to.
You are looking for a micro DNA tube.