Seeki.eu lists 550+ properties for sale and 350+ to rent in Oeiras.
The median asking price is €590,000, or €4,882 per m² on a typical 130 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 €1,600 a month, across apartment rentals that publish both a price and a floor area.