James J. Hill HouseExperience the life and times of James J. Hill, transportation pioneer and builder of the Great Northern Railroad. Completed in 1891, the mansion was the largest and most expensive home in Minnesota. It contained 36,000 square feet on five floors including 13 bathrooms, 22 fireplaces, 16 crystal chandeliers, a two-story skylit art gallery, a 100-foot reception hall, and a profusion of elaborately carved oak and mahogany woodwork. Sophisticated technical systems throughout the mansion provided central heating, gas and electric lighting, plumbing, ventilation, security and communication. The final cost totaled $931,275.01 including construction, furnishings and landscaping for the three-acre estate. The home is located on historic Summit Avenue in St. Paul.