In the second half of the 1600s, the renaissance palace was felt to be outdated and Gabriel Bengtsson Oxenstierna’s son, Chancery President Bengt Oxenstierna, had the palace transformed with a modern baroque style. He obtained help from Sweden’s leading architect, Nicodemus Tessin the Younger. New wings were added and grots, amongst other things in the palace park, were furnished and are still preserved today. The high renaissance gables of the main building were lowered and the house was coiffed with a mansard. Even a magnificent colonnade gallery has been preserved from this period.