In the 1998 Godzilla movie, the titular monster smashes through the 246.3 m tall MetLife building.
Volume: 28374129295 cubic centimers. Taking 80% away for hollowness equals 22699303436 cubic centimeters for the hollow part and 5674825859 cc for the solid part.
The building is mostly made of steel and concrete.
Density of steel: Between 7.75 and 8.05 g/cm3 (I'll use 7.75)
Density of concrete: 3.15 g/cm3
Median density: 5.45 g/cm3
I'll use the violent fragmentation (we don't see if there are any big chunks so it's at least this strong) of reinforced concrete, just in case: 61.2 J/cc x 5674825859 J = 3.47299343e11 J = 83006.53513384 kg of TNT (City Block level)