The lawsuit's plaintiffs include two Czech tourists and a museum member, according to a Reuters report. They are arguing that the museum uses misleading signs and other methods to make visitors believe that they must pay to gain admission.
A similar suit was filed against the museum late last year by two museum members who have argued that the museum's signage is misleading to the public.
The $25 recommended admission price applies to adults. Seniors who are 65 years and older have a recommended admission price of $17. Children under 12 can enter free when accompanied by an adult.
Under an agreement with
A spokesman for the museum told Reuters that it is "confident that our longstanding pay-what-you-wish admissions policy meets the spirit and letter of our agreement with the city."
In 2011, the museum raised its recommended admission by $5 to $25.
The museum said at the time that it "faces a number of daunting, ongoing budgetary challenges" and that "income from our endowment has flattened, the average visitor contribution at the door is lower, and public sector operating support has fallen."
Admission prices to art museums around the country vary widely, though many charge more than the price of a movie ticket.
The Dallas Museum of Art recently dropped its $10 general admission fee and allows visitors to enter for free, though certain special exhibitions require a separate paid admission.