brownstone
noun mainly US uk/ˈbraʊn.stəʊn/ us/ˈbraʊn.stoʊn/
[ C ]（尤指多见于纽约的）外墙为褐沙石的房屋
a house with its front built of a reddish-brown stone, especially common in New York City
[ U ]（建筑用）赤褐色砂石
a kind of reddish-brown stone used for building