Situated directly north and west of The Grange, the main building was opened to the public in 1918, and has underwent a number of expansions and renovations since opening. Plans for the "main building" to the north of The Grange originated in 1912, when the architectural firm Darling and Pearson submitted their expansion plans for the north of The Grange. Due to The Grange's location, and historic value, the expansion plans were limited along the southern portions of the museum's property; as the museum wanted to preserve The Grange's southern facade, and the municipal park south of the building.