How to curve a wall from blueprints.

currently i have what’s in the image below… the top left wall needs to follow the curve in the blueprint, how should I do this? note: the wall will have a window in it also

http://img230.imageshack.us/img230/358/screenshotav7.png
http://img230.imageshack.us/img230/screenshotav7.png/1/w1407.png