I've been approached at finding the best way to serve wifi at an apartment complex with several buildings. Here is an overview of the premisis: The red lines represent breezeways within the complex, it's an open breezeway, two stories tall with nothing more than some metal stairs in each one. The office is in the center. The main problem here is that the exterior walls of the buildings consist of steel reinforced concrete. I was thinking an access point at the office with an antenna, then have a repeater in each breezeway. What do you guys think would be the best approach in this situation?