The Rondout Social Maennerchor was formed on February 22, 1868, by a handful of German immigrants who loved choral singing. They were drawn together by their common language, and love for music, singing, and social activities so that their clubhouse, "Washington Hall", became a gathering place for similar organizations up and down the Hudson River.

http://www.ghf-nj.org/Kingston.htm

WASHINGTON HALL Scott & WEBER Proprietors A well regulated and ventilated Hall heated by improved heaters and lighted by gas Has recently undergone a costly reparation and is now in perfect condition Will seat comfortably 700 Hotel attached Established in 1848 

Sweet's Amusement Directory and Travelers' Guide: From the Atlantic to the Pacific  (1871)

Actual location unknown