I like the idea of re-shooting at night! As you stated, changing the primary light source to that which creeps out of each unit could yield some interesting results. I may even wait for a warmer night when people are out using their patios to add a human element. I might also try it in color depending what the apartment lights look like. I may also try the dusk shot; it should help eliminate the harsh backlighting which is robbing me of some detail. Thanks for the ideas!