Martin Kessman, 64, who weighs 290 pounds, said he first realized he couldn't fit into the stationary booths at the Nanuet White Castle in April 2009 and the restaurant responded to his written complaint with three "very condescending letters," the New York Post reported Monday.
"In each letter was a coupon for three free hamburgers -- but the cheese was extra!" Kessman wrote in his lawsuit, which was filed in New York federal court last week.
Kessman said restaurant officials promised to put in larger seats, but they have failed to follow through more than two years later.
The Americans with Disabilities Act is "applicable, not only to me, but to pregnant women and to handicapped people," he said in the lawsuit.
"I just want to sit down like a normal person," Kessman said.
The lawsuit is seeking larger chairs at the eatery and unspecified damages.