According to plans by architect Maximilian von Welsch, the palace was systematically converted into the summer residence of the princely house from 1707.

Following the transfer to the Nassau-Usingen line, two side wings were added to the palace and Prince Karl chose it as his main residence in 1744. With the simultaneous relocation of the government authorities to Wiesbaden, this became the capital city.

After the early death of his wife, Prince Karl entered into a so-called "left-hand marriage" with Maria Magdalena Groß from Wiesbaden; the children from this union were given the name Barons of Biburg.