This is a second set of nesting urban buildings for 28mm gaming. This set adds some exposed cinderblocks and a two story building with most of the first floor intact, providing more opportunities for ground level cover than with the other buildings.
The back of the first floor of the two story building is removable; it slides into place from the top. Be careful when printing to make sure that any brim/ears doesn't end up inadvertently attaching the wall to the rest of the building!
The shim is meant to be cut and used to align the second floor of the two story building with the walls of the first floor.