This is a resin detail parts set for use with military vehicle kits.
From the Airfix website:
Czechoslovakia was annexed by Nazi Germany in 1938, but it was not until the Soviet forces came streaming across from the east in 1944 and 1945 that massive destruction of cities, towns and villages took place. This restaurant building makes for a perfect focal point for modelling a scene from this period.
When completed, this model measures about 130mm long, 80mm wide and 120mm tall.