1) An Ivy League jewel 2) Many a Park Slope residence 3) New york city dwelling 4) Reddish brown in color 5) Row house genre 6) Sandstone 7) Singers James + Sly 8) Used in buildings 1) Townhouse 
[group] Brownstone is an American female contemporary R&B group that was popular during the mid-1990s. They are best known for their 1995 hit single `If You Love Me`, which was nominated for a Best R&B Performance Grammy Award. `Grapevyne` and `Pass the Lovin`` also brought them some success, as well as their rendition of `I Can`t Tell You ...
• (n.) A dark variety of sandstone, much used for building purposes.
A dark-brown or reddish-brown sandstone. A sedimentary rock.
Brown'stone` noun A dark variety of sandstone, much used for building purposes. 
A sandstone of characteristic brown or reddish-brown color that is due to a prominent amount of iron oxide as interstitial material. Or, a term applied to ferruginous dark brown and reddish brown askosic sandstones extensively used for construction in the U.S. during the 19th century Stone for New York City
[n] - a reddish brown sandstone 2. [n] - a row house built of brownstone
noun a row house built of brownstone; reddish brown in color
A sandstone of characteristic brown or reddish-brown color that is due to a prominent amount of iron oxide, as interstitial material.
a reddish-brown sandstone, used extensively as a building material. · Also calleda building, esp. a row house, fronted with this stone.