I am searching for free building data and foorprints, preferably GIS shapefiles but data tables are also welcomed, for Albania, Bosnia, and Macedonia. I am working on estimating people per building in a known locations within those countries. Then, applying the values to intrepolate population. Your help and advice is greatly appreciated.
Openstreetmap would be a good place to explore first. Then I would recommend going looking at each countries statistical/data office, and then each city that you are interested.
There are a few other questions on this site about global data which may be of use.