Seeki.eu lists 650+ properties for sale and 40+ to rent in Groningen.
The median asking price is €385,000, or €3,571 per m² on a typical 111 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.