The palace was built in the early 19th century at the request of Józef Mielżyński, according to a design by K.F. Schinkel, as a (then relatively modest) villa-palace.
In the mid-19th century, it was expanded to include the wings of the southern façade, the western wing, and a tower in the Neo-Renaissance style. The reconstruction was designed by Count Seweryn Mielżyński himself. He intended to designate the eastern wing of the façade as a picture gallery.
The next reconstruction took place at the end of the 19th century. It was carried out by the next owner of Miłosław, Józef Kościelski, to whom the palace owes its regular façade wings, the Grand Order portico, the balustrade-like finial, and the additional tower story, among other things. Thanks to these efforts, the palace acquired the classic appearance of a Neo-Renaissance residence. The façade, with its central projection and Grand Order portico, is particularly impressive. Four Ionic columns support the architrave, which supports the triangular pediment. The avant-corps is connected to the side wings, which protrude significantly from the facade, and feature charming galleries decorated with vases. A quadrangular tower, topped by a belvedere surrounded by a balustrade, dominates the entire structure. The garden façade is enhanced by a perpendicularly added wing. The palace stands in a beautiful landscaped park.
(naprzekordniom.wordpress.com)
Currently (October 2025), the building is undergoing facade renovations.