 The 35-room mansion has four stories, as well as a carriage house tower, built before the Castle in 1901, and of formal gardens and landscaping, including greenhouses, which were completed in 1899.George Joslyn spared little expense planting mature trees on the grounds, and Sarah collected rare botanicals from around the world, especially orchids.According to The Friends of Joslyn Castle, the home was built in just eleven months at a cost of $250,000.