sentences:  In 1846, a new building, known as Mansion House, was built by noted local builder/architect Charles Steadman on the east side of the original structure, which then became known as the west wing.In the 1880s the two buildings were combined.In the 1930s Edger Palmer, a major donor to Princeton University and leading figure in the town, desired to bring an urban redevelopment to Princeton similar in concept, if not scale, to Rockefeller Center in New York.