Networks

Any ideas on how to enable a five floor, 7 apartment building without using cables, and not getting lag from using wireless bridges?

The builder decided that he would enable the whole block during the last phase of construction, so that put the brakes on the possibility of dropping ethernet cable in, and hardwiring to each apartment, and then let the future residents decide on what they wanted in there.

The only place I can fit the ethernet is down the central utilities duct, now, and was thinking of using a dedicated WiFi router on each floor...

Any ideas would be greatly appreciated!