Every week, the complex offers an agenda filled with diverse activities: concerts, theater performances, art exhibitions, vernissages, conferences, meetings, banquets and symposiums.

Fragments from the original mansion (17th century) are still preserved, like the stone wall strengthening the palace on the ravine side of the hill and the semicircular corner tower.

[5] The two-story baroque mansion with Saxon Rococo elements was built in 1759-1766 by Paweł Michał Mostowski (1721-1766), general-lieutenant of the army of the Crown(1758) and Voivode (1758-1766) who took part to the Bar Confederation.

The front elevation displays a small stone balcony over the entrance and an apparent avant-corps framed by two pairs of pilasters, topped with a triangular pediment.

[2] The park is additionally watered by its natural network that runs throughout the entire complex: a stream and four ponds called Kluczyki,[4] encircled by lawns, shrubs, perennials and aquatic plants.

[10] In 2016, Bydgoszcz Municipal Cultural Centre published a bilingual (Polish-English) catalog of the exhibition Andrzej Szwalbe Collection of historic pianos, written by Benjamin Vogel.

One of them, Bartolomaeus Ostromecki, hetman and standard-bearer from Chełmno, was offered in 1585, by king Stephen Báthory, for his meritorious services, the village of Adsel (now Gaujiena) and the territory of Ruinen (today Rūjiena) in historical Livonia.

[12] The Ostromęcki family also owned folwarks and Nowy Dwór estate, connected to Ostromecko, with land, windmills, craft workshops and livestock (sheep).

[12] On May 27, 1708, the manor was entirely burned down as a consequence of the ongoing Great Northern War, and the property plundered by a unit of Swedish dragoons from the regiment led by Colonel Charles G. von Marschalck.

[11] Bogdan Teodor Mostowski had a new house built, as depicted on the Ostromecko panorama realized in 1738–1744 by Georg Friedrich Steiner:[13] it was a one-story brick mansion with eight rooms and three cellars, surrounded by an Italian garden.

[5] Paweł Mostowski's career was supported by the Czartoryski family and Heinrich von Brühl, an influent Polish-Saxon statesman who helped him get the voivodship head and the Order of the White Eagle.

[12] Eventually, king Stanisław August Poniatowski moved Mostowski to the position of voivode of Masovia in 1763, then expelled him from the country in 1768 for his participation to the Bar Confederation.

[12] Under Prussian rule, the estate changed owners every few years, being a subject of land speculation: In 1804, the domain was bought by the Schönborns from Grudziądz, a rich merchant family dealing with grain business.

In October 1806, the Palace hosted the Prussian royal couple, Frederick William III and his wife Louise, who left Berlin to East Prussia to escape Napoleon's troops.

Jakub Marcin Schönborn, Ostromecko landlord and a successful entrepreneur, was ennobled in 1812, by decision of Frederick Augustus I of Saxony, then Duke of Warsaw.

With the abolition of serfdom sanctioned by the Prussian legislation (1823–1850), the Schönborn administration transferred part of its land to the peasants and required the smallholders to work in the farm and in the nascent manor industry.

In addition, the road from Strzyżawa to Dąbrowa Chełmińska was laid (1853–1856),[12] allowing Gottlieb von Schönborn to modify its route so that his palace was visible from a distance.

When his father passed away in 1879, Albrecht took over the family estate in Erxleben, Saxony-Anhalt: he leased it after his union with Marta Matylda to dedicate his time to the management of Schönborn's domaines (including Ostromecko, Głuchowo, Cichoradz).

[12] In 1880, the Alvensleben family was officially listed as Lord of Ostromecko and in 1888, Albrecht received from the German emperor Frederick III the title of Count von Alvensleben-Schönborn.

In 1930, when the Association of Insurgents and Soldiers of Ostromecko initiated the erection of a monument to commemorate the 10th anniversary of national independence, Joachim Alvensleben provided construction materials and bricklayers.

[12] Prior to the outset of World War II, a Polish sapper unit was billeted in Ostromecko: on September 2, 1939, it carried out the blow up of the Fordon bridge on several spans.

In September 1943, the domain was then confiscated by the Treasury of the Third Reich, which nominated Karl Anton von Falkenheim, a Selbstschutz member from Hallerowo near Władysławowo, as an administrator.

Fortunately, the Alvensleben-Schönborn family (Ludolf and his ex-wife Katarzyna), together with Alberto Bellardiricci, a former Italian ambassador in Berlin and a personal friend of Joachim from the Ostromecko hunting parties in the 1930s, were able to pull strings to get him released on February 9, 1940.

This situation faced a strong opposition from Ludolf's stepbrother Albrecht Werner: in 1924, conflicting with his father, he left the house to live in a farm at Cichoradz, approximately 13 km from Ostromecko.

Until the outbreak of World War II, Albrecht Werner attempted to have the justice appoint a curator to his stepfather for the estate in Ostromecko, so as to prevent Ludolf to get the inheritance of the domain.

Werner had also two cousins who joined the German forces: In September 1939, he had his stepfather Joachim von Alvensleben arrested for pro-Polish activities and sent him to concentration camps.

Incorporated into the 3rd SS Panzer Division Totenkopf, Werner fought for a while on the Eastern Front, before being evacuated to a military hospital in Warsaw to treat is wounds.

In 1985, the Pomeranian Philharmonic took over the management of the Old Palace and the surrounding park:[5] at the time, the ensemble was nicknamed "Bydgoszcz Wilanów"[20] and it was planned to transform it into a regional cultural centre.

Thanks to the initiative and passion of Andrzej Szwalbe, then director of the Pomeranian Philharmonic, the Old Palace received a collection of contemporary Polish paintings and graphics, as well as 50 historic upright and grand pianos.

From 1985 to 1989, exhibitions and concerts in the Old Palace took place, welcoming, among others, Tadeusz Brzozowski, Krzysztof Penderecki, Henryk Górecki, Halina Czerny-Stefańska, Regina Smendzianka and many artists of international renown.