Hello,
I'm trying to model a large towerblock, and the windows need to be recessed, with a window ledge sticking out under each one. There are many windows and I can't find a simple method for doing them all. I'll describe how I'm doing them (which is very slow) and if anyone can tell me a nicer way it would be greatly appreciated.

for each column of windows I've used the split poly tool to cut two vertical lines for the window edges, then for every window I've made similar horizontal splits, after making sure these were aligned I used extrude to push in the windows then again on the faces below to make the ledges... then after they were all made I did vertex manipulations to get them all the same size. It's a very time consuming processes.
Any advice would be greatly apprecated.

thanks.