From eye-level, Tetra Lounge looks like an upscale coffee shop rolled into a nightclub.

Brick walls, painted white, box in DJ booths and a bar, while attractive glass cases and furniture dot the 2,000-square-foot space at 3039 Walnut St. in the River North Art District.

But look down and you’re suddenly in a weed dealer’s apartment from the black-market era of cannabis: plush but worn couches, video game controllers, scattered bits of bright-green leaves, and a friendly, roaming Rottweiler named Kena.

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