If you look in the rebar photo, you'll see sleeves for plumbing, electric and HVAC. One of the stipulations on this project is nothing can penetrate the exterior walls. There are 20 apartments, all with gas fired direct vent furnaces. The exhaust and fresh air intact PVC must run up and out the roof. The good thing is the apartments are stacked; layout on 3rd floor is exactly as 2nd floor. After the slab forms were in place, we had to layout the apartment walls prior to rebar to install the sleeves. Most were good, however, some of the sleeves were next to a door and now have to be moved because of the door header is blocking passage. Photos will keep coming.