Tilton worked in the partnership
Boring & Tilton (1881–1904), as a solo architect, in the partnership
Tilton & Githens (1916–1932), then again briefly in solo practice as consulting architect until his death.
Boring & Tilton (1881–1904) , 1897-1900 • U.S. Immigration Station on
Ellis Island in
New York Harbor: • Main Building (1897–1900) • Kitchen and Laundry Building (1900–01) • Main Powerhouse (1900–01) • Main Hospital Building (1900–01) •
Bayonne Public Library, Bayonne, New Jersey, 1904
Tilton (1904–1916) •
Ludington Public Library, Ludington, Michigan, 1906 •
Olean Public Library, Olean, New York, 1907 •
Concordia College campus,
Bronxville, New York, 1908 • Carnegie Science Hall (renamed to Stuart Hall in 1977) at
Coe College,
Cedar Rapids,
Iowa, 1910 •
Elizabeth Public Library, Elizabeth, New Jersey, 1912 •
Springfield City Library, Springfield, Massachusetts, 1912 •
Sioux City Free Public Library, Sioux City, Iowa, 1913 •
Carpenter Memorial Library, Manchester, New Hampshire, 1914 (with architect
Edgar Allen Poe Newcomb) •
Mount Pleasant Library, Washington DC, 1925 • McGregor Public Library,
Highland Park, MI, 1926 •
Currier Museum of Art, Manchester, New Hampshire, 1929 • Central Library,
Enoch Pratt Free Library, Baltimore, Maryland, 1931-1933 ==Personal life==