Bolt action building occupation markers

The last game we ran had a lot of buildings and it got a bit of a hassle to keep track of which unit was in which building. I made some markers that sit snugly on top of a roof so it's easy to see which building has a unit in it (marker for 1st and 2nd floor). If you don't put the units in the building there is also a marker to indicate which unit belongs to which bilding marker. I thought I'd share this in case someone might find it usefull :-)