The building is the seat of Raiffeisen Bank and is open during business hours.
Wikipedia https://en.wikipedia.org/wiki/Looshaus
Official website http://www.adolfloos.at/looshaus/index.htm
More information http://architecture.about.com/od/europ1/a/goldman.htm
Address Herrengasse 2-4, 1010 Vienna, Austria
Coordinates 48°12'30.362" N 16°22'0.011" E