I live across the street from a place I can't imagine being anything other than a front. Their food is terrible, limited menu, they have events often where only a couple people show up, the lot is big and in a prime location, often VERY expensive cars are parked there, and it isn't uncommon to see unmarked vans at the loading dock. Like I joke a lot about places being fronts, but this one I legit believe couldn't be anything else
There's a restaurant space near me that shares a building with a coin laundry, this space has different restaurants cycle in and out at least once a year. I never see anyone eating there, and everything about the interior screams "minimum required to stay open"