First question always is: what version of poser do you have? If you have P11 or I believe P9-10 as well you can crank up the ambient (white) in the window texture for the buildings to 10-20 (making sure properties has "emit light" ticked. Drawback is you will need a higher render setting and a longer render time to avoid the "fireflies" if you are using Superfly (P11/PP11).

Boni

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"Be Hero to Yourself" -- Peter Tork