Manor house in Gręzów. It was built by Wacław Jędrzejewski, the author of the reconstruction of the manor house in Chlewiska (currently Reymontówka), around 1921. The first owners of the estate were the Różański family, and then the Helbich family. From 1926 it belonged to Aurelia Reymontowa, née Szacsznajdrów, wife of the writer Władysław Reymont. In 1930 it was most likely acquired by Feliks Tymieniecki. After 1945 it became the property of the State Fisheries Farm in Siedlce. In 2009, the estate was purchased from the State Treasury by the heir of the owners, exercising the right of first refusal.
Single-storey, covered with a hipped roof with a four-column portico on the axis topped with a gable roof. On both side elevations there are small annexes covered with three-pitched roofs. The original element is a three-sided projection on the axis of the rear elevation of the manor. The tented roof gives it the character of a castle turret. The rear elevation does not have a garden character - there is no door leading to the garden. The manor faces the park at the front, and at the back there is a beautiful farm layout. It once created a full, self-sufficient world, one of the last such worlds that finally disappeared with the agricultural reform initiated by the PKWN decree of September 6, 1944.