After spending about $1 million to restore the former public bathroom on the Boston Common, the Earl of Sandwich signed a 15-year lease and plans to open next month. 

The Florida-based restaurant chain offers salads, wraps, desserts and, obviously, sandwiches. It first opened in Boston at Logan International Airport in 2009 and has dozens of franchises around the country. 

The owner will pay $50,000 a year to use the former comfort station, also known as the Pink Palace, a 660-square-foot structure built in the 1920s and vacant for decades.

Earl of Sandwich was scheduled to be ready by the end of August but opening day has been pushed back to next month, the Boston Herald reported Sunday.  Under the terms of the lease, the restaurant would be closed in the winter.