If you are still stuck, please scroll down to learn more about each hint.
Hint #1
Use the knowledge that Batemen could not have traveled more than 5 miles from his home without getting caught to help you narrow down where he could have taken Detective Cullen. You'll need a piece of evidence that illustrates the layout of the area.
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Hint #2
Visit Bateman's website and check his listed vacancies. Do any of them fall under the radius he could have traveled with Detective Cullen?
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Hint #3
Be thorough as you look through the vacancies listed in the radius of where Bateman could have taken Detective Cullen. Do any of those vacancies feature a way for Bateman and Cullen to get back above ground from the drain pipe?
Still Lost?
Here's a final hint to get you to the next objective...
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The clue you're looking for is found in a photo of one of the listings. Look on the ground in the photos and you'll find evidence of a way Bateman and Detective Cullen could have come above ground from the drain pipe.