BILLERICA — The large sign on the front of Mac’s Two Lounge still advertises “18 Plus 7 Days a Week” and “Amateur Nite every Tuesday,” but its parking lot sits empty and its door locked. After decades of operation, the strip club has closed.

Mac’s Two has long been a point of contention in town, largely in part due to its location at 176 Boston Road where it greets drivers heading into town from Lowell, Chelmsford and Route 3. Those who for years hoped to see it close said Mac’s Two gave Billerica a bad image.

Built in 1974, the club was Billerica’s only adult entertainment. It lost its liquor license in 1996 under the previous owner Norman “Blackie” McKay and has also gotten in trouble for gambling and obscenity violations, as the Sun previously reported.

Rather than closing after losing its license, the club dropped its age restriction from 21 plus to 18 plus. Its website, which is still active, advertises 18th birthday “Coming of Age” parties.

Now, exotic dancers for Mac’s Two are suing Cado, Inc., the company that owns Mac’s Two, and Sandra Brennan, Cado, Inc.’s president and treasurer, in a class-action lawsuit.

The complaint obtained by The Sun, names Rhiannon Unger and Cynthia Brennon, who worked as exotic dancers at the club, as plaintiffs who are suing on behalf of a class of other individuals who also worked as exotic dancers at the club.

The complaint alleges that Brennan and Cado, Inc. did not pay the exotic dancers minimum wage and overtime, mandated the dancers pay house fees ranging from $30 to $40 per shift, purchase $15 T-shirts per shift and share their tips with DJs. The complaint also alleges that the defendants misclassified the dancers as independent contractors although they were employees and “must legally be treated as employees for wages, overtime, health insurance and all other employment purposes and benefits.”

Designating them contractors violated the plaintiffs’ rights under Massachusetts law, the complaint said.

The dancers are seeking declaratory judgment that the dancers were employees, not independent contractors, damages for all owed wages, overtime payments, shift fees, “house fees,” all other unlawful fees and employment benefits, statutory trebling of all wage-related damages, attorney’s fees and any other relief the court deems just.

David Dishman, the attorney for Unger and Brennon, declined to comment.

It is unclear if the club’s closure a few weeks ago is connected to the lawsuit.

Multiple attempts to reach Brennan were unsuccessful and her attorney, Philip Kalil, declined to comment.

“I do know that Sandy had been thinking of selling for a couple of years,” said Community Development Director Rob Anderson. “After her husband passed she no longer wanted to run the club, she was thinking about an exit strategy for a couple of years.”

According to Anderson, a developer that owns the former Mobil gas station site at the corner of Treble Cove Road and Boston Road, has purchased or intends to purchase the Mac’s Two site which sits next door.

It is the kind of move the town was hoping to see.

“We definitely have an interest in the site, we have an interest that it is a higher-end use,” said Town Manager John Curran. “We have been working for years trying to encourage use of that site and it’s coming to fruition, it sounds like.”

Anderson said the town believes the site would be perfect for a restaurant.

To that end, the town’s economic development team has cultivated a list of people who might be interested in opening a restaurant there, Anderson said. The team will do some cold calling and aims to bring the research to the developer.

“Hopefully there’s a marriage that works pretty well,” Anderson said.