My sister's & my families live in an apartment inherited from my dad. My dad passed away in yr 2003. The apartment was built around 1983 and was rented out since its purchase. My dad did moved-in in Yr 1999 for about a yr when his residence was under renovation. This apartment was renovated in Yr 2001/02. My sister moved-in in Yr 2002 for a few months and again in Yr 2005. I subsequently moved-in end 2005. I only did some painting and move in furniture before I move in. We only became official owners of the apartment in yr 2003. So does my apartment belong to period 6, 7 or 8?