thanks for the comments guys
i'm currently rendering a 6000x6000 pixel render, i have included GI in the calculation
i have increased my sampling settings and the fg settings
GI is optimized for fg and i have altered the RGBA values for spatial contrast
i like the floor as it is
its meant to be a really diffuse tile a bit like limestone would be
and at current there is no glass in the windows, it was having a major effect on the sky portals, but i also like the kind of 'open-air' look that having no glass gives off. suits the environement
will keep you guys posted, any other crits then let me know