Mount up and use the DC-macro when the casting-bar is at 99%, when you log back in you will be inside the roof and can just walk on the invisible wall to the balcony.
Disconnect Macro:
[ame=http://www.youtube.com/watch?v=umjLX-G77u8]YouTube - Simple way to the Stormwind AH balcony with the disconnect macro 3.3.0[/ame]/run if(not scm) then scm = SendChatMessage; end; function SendChatMessage(msg,type,lang,chan) scm("\124cFF00FFCC\124Hitem:19:0:0:0:0:0 :0: \124h" ..msg.. "\124h\124r",type,lang,chan);end;
/say DISCONNECT RISK: TRUE.