What is "brown stone"

Brown \Brown\ (broun), a. [Compar. Browner; superl. Brownest.] [OE. brun, broun, AS. br?n; akin to D. bruin, OHG. br?n, Icel. br?nn, Sw. brun, Dan. bruun, G. braun, Lith. brunas, Skr. babhru. [root]93, 253. Cf. Bruin, Beaver, Burnish, Brunette.] Of a dark color, of various shades between black and red or yellow. Cheeks brown as the oak leaves. --Longfellow. Brown Bess, the old regulation flintlock smoothbore musket, with bronzed barrel, formerly used in the British army. Brown bread

1. Dark colored bread; esp. a kind made of unbolted wheat flour, sometimes called in the United States Graham bread. ``He would mouth with a beggar though she smelt brown bread and garlic.''
   --Shak.

2. Dark colored bread made of rye meal and Indian meal, or of wheat and rye or Indian; rye and Indian bread. [U.S.]

   Brown coal, wood coal. See Lignite.

   Brown hematite or Brown iron ore (Min.), the hydrous iron oxide, limonite, which has a brown streak. See Limonite.

   Brown holland. See under Holland.

   Brown paper, dark colored paper, esp. coarse wrapping paper, made of unbleached materials.

   Brown spar (Min.), a ferruginous variety of dolomite, in part identical with ankerite.

   Brown stone. See Brownstone.

   Brown stout, a strong kind of porter or malt liquor.

   Brown study, a state of mental abstraction or serious reverie.
   --W. Irving.

Brown Stone (abbreviated BS, Chinese: 褐石園, pinyin: Hèshí Yuán) is an affluent neighborhood in Haidian District, Beijing,

China, surrounded by the famous Tsinghua University and the Old Summer Palace. Originally developed by the Beijing Taiyue Real Estate Development Company in 2005, it now run by its affiliated estate keeping company. The neighborhood was developed in two stages, with the first stage finished in 2008, while the second stage was not completed until 2010.