The building which was about 50 metres (165 feet) from the tent where Kadhafi generally meets guests was flattened.
The administrative structure was hit by a missile, official Libyan spokesman Moussa Ibrahim told journalists who were taken to the site by bus.
Tripoli was rocked by powerful explosions late Sunday, of which one was heard coming from the area around Kadhafi`s residence.
Smoke billowed from the residence and barracks at Bab el-Aziziya in the south of the Libyan capital as anti aircraft guns fired shots. (*)
Editor: Kunto Wibisono
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