Seeki.eu lists 1+ properties for sale and 40+ to rent in Groningen.
The median asking price is €389,500, or €3,590 per m² on a typical 112 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 €1,236 a month, across apartment rentals that publish both a price and a floor area.