1866 – YMCA, Derry, Co. Derry Architect: John G. Ferguson Constructed on site of former Linen Hall. Cornice enriched with medallions of heads of Calvin,
1877 – The Apprentice Boys Memorial Hall, Derry Architect: John G. Ferguson / Robinson & Davidson The original part of the Hall was opened in 1877, and dedicated to the memory of the thirteen apprentice boys who closed the city gates in 1688.
1887 – Derry Guildhall Architect: John G. Ferguson / M.A. Robinson The Guildhall was originally built in 1887 by The Honourable The Irish Society at a cost of £19,000.00 and was officially opened in July 1890.