thanks Pony
The amount of walls is not so much to turn them into polys - unless I'd have to use a non homogeneous texture. FG settings are not too high - I already have Maya closed so I do not know exactly what they are.
No , dirty maps here - I think they would make the interior look old and in this case I am not sure it would make the client too happy.
nir
In the low res image the shadow look softer.