The court gardener Christian Daniel Friedrich Klett (1774–1845) received the property on which the building in Schloßgartenallee stands today as a gift from the Grand Duke. The so-called "Old Court Gardener's House" was built in 1822 and later, became the property of the Grand Duke again. After 1840, it was probably used mainly as a residence for gardeners. In 1909, the building was modernized in a typical rural style. Together with the cold house that has been preserved on the site it represents an essential part of the facilities of the former plant nursery belonging to the castle gardens.