I would consult with a local attorney. I think your argument is VERY rational...but rational does not always win in the eyes of the law. You may also try to lobby the property owner to not lease space to them.

Keep in mind that although the local ordinance is a start, the 80/20 rule only means that they'll sell "adult clothing" and "unrated" items in the 80% area. I'm not sure what is defined as "x-rated retail goods", but my guess is that a good portion of what is sold at a porn shop would technically not be categorized as "x-rated"....since there's no "rating system" that I'm aware of for anything other than movies...is there?

So, I'm not certain what protection the ordinance provides.

Here, any ordinance with any ambiguity has been deemed "null and void" by enforcement agencies. Here's an example from this week's news:

EVANSVILLE, Ind. - A family can allow their chickens to roam their backyard, despite complaints from a neighbor, because a new city ordinance is unclear, a city board ruled.

Neil and Melissa Troost allow their six hens to run around their fenced backyard during the day, but put the birds in a coop at night.

They contend that complies with an Evansville city ordinance that requires chickens be "kept" in a coop at least 50 feet from neighbors.

Their next-door neighbor, Bill Bryant, complained to the Animal Control and Education Commission Board that the birds are smelly and obnoxious.

"I just want to be able to go out with family or friends in my backyard to grill a hamburger without embarrassment," he said.

Board members said they intended the ordinance to restrict the hens at all times to an area at least 50 feet removed from a neighboring property.

But board president Marlin Beck said, "the ordinance does not say that, and you cannot enforce assumptions."
Board member Scott Thompson encouraged the Troosts to keep their chickens confined to a smaller area. He said the ordinance needed to be "tightened and polished."