Seeki.eu lists 800+ properties for sale and 65+ to rent in Groningen.
The median asking price is €325,000, or €4,299 per m² on a typical 79 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 €1,131 a month, across apartment rentals that publish both a price and a floor area.