Seeki.eu lists 30+ properties for sale and 5+ to rent in Grünheide (Mark).
The median asking price is €516,400, or €3,243 per m² on a typical 132 m², across sale listings that publish both a price and a floor area.
On the rental side, the median asking rent for an apartment is €1,250 a month, across apartment rentals that publish both a price and a floor area.