 In 1880, Tilden opened an office in Boston as partner with Arthur Rotch under the name of Rotch & Tilden, and over the next 15 years they maintained one of the most active architectural offices in New England.As well as buildings in New York City, Washington, D.C., and Charleston, South Carolina, the firm's work included the Milton Town Hall, Sargent Normal School and Gymnasium at Cambridge, the Wellesley College Art Museum, Plymouth High School, Jesup Hall at Williams College, the Billerica Public Library, the Blue Hill Observatory, and Boston's American Legion Building.After Arthur Rotch died in 1894, Tilden practiced solo in Boston, until 1915 when he retired to his home in Milton, Massachusetts.