Third Street Alliance is housed in two historical buildings.
The main building is the Simon house, once the home of Easton silk merchant Herman Simon. It was begun in 1902 and construction took nearly two years to complete. Designed in the French chateau style by architect William Michler, the Simon House has an exterior of Indiana limestone with a granite base and a roof of Vermont red slate.
Visitors to the building are often struck by the elaborate woodcarving throughout the historic rooms. The dining room boasts an original mural by Taylor Rue and curved windows that were once the exterior of the building. Mr. Simon's library and den on the second floor reflect his pride in his German heritage. Each of these rooms has a magnificent fireplace and leather walls. The German influence is seen throughout the building with the exception of the front parlor, which was done in French style customary to wealthy Europeans.
The original building once had formal gardens that were lost when the adjacent Bixler Building was built in the 1920's. Additions in 1955 and 1971 added increased space for programs.