The Larkin building was completely revolutionary for the time. Most obviously it was one of the first buildings to use a form of air conditioning that was integral to its design. The main pillars would circulate air through them and treat them with a water mist to cool and cleans the air as it flowed into the rest of the building...Watch a brief clip here from the Ken Burns's biopic of Wright discussing the Larkin Building.
The building was designed with both elevators and stairways. Its open center section was lit with large plate glass windows and a large skylight...
LINKS: Larkin Building - Ken Burns's 'Frank Lloyd Wright' documentary