I found this ones in english.

BCI Real Estate: Properties, Flats, Villas, Houses, Lands, Plots, Farms, Buildings, Offices, Shops and/or Warehouses for sale or rental in Portugal

realestate.yellowpages.pai.pt: houses, flats, buildings, lands, garages for sale or rental

They seem to cover all the country and may be handy if you know what you are looking for.