In Sydney Sulman briefly formed a partnership with C. H. E. Blackmann from 1886 to 1888, then from 1889 formed the practice Sulman & Power with Joseph Porter Power. The partnership designed many notable buildings in Sydney, country NSW, and in other capital cities, including large office buildings, churches, colleges, hospitals, and houses for prominent people. His residential and college designs of the late 1880s shows early influence of the Queen Anne or Arts & Crafts (later known as Federation), while his commercial designs were Palladian or Baroque, and his churches Gothic or Romanesque. Many of the larger city buildings have been demolished. Notable designs included the Italianate/Federation style Thomas Walker Convalescent Hospital, Concord, Sydney (1892), the Palladian style A.M.P. buildings in Brisbane (1886) and the Edwardian Baroque style Melbourne example (1906) (both demolished), the grand Baroque style (Colonial) Mutual Life Association building, Sydney (1889, demolished), The Armidale School in northern NSW (1893) in an inventive Federation style, the Romanesque Sargood warehouse (now Ross House), Melbourne (1899) and several suburban churches such as the Romanesque St Andrew's Manly (1890). Between 1887 and 1912 Sulman was P. N. Russell lecturer in architecture at the University of Sydney. After 1908 he retired from active practice to some extent to develop his interest in town-planning. From 1916 to 1927 he was the Vernon lecturer in town planning at the University of Sydney. In 1921 he published his "An Introduction to the Study of Town Planning in Australia".