Luoyang (705) — the same event in Old Book of Tang and New Book of Tang

Old Book of Tang: Wu Zetian died at the age of 83 at the Xianju Hall of Shangyang Palace.; New Book of Tang: Empress Wu died in the Shangyang Palace.

What each source says

Old Book of Tang (Jiu Tangshu), Annals · AD 705 · 洛陽

Wu Zetian died at the age of 83 at the Xianju Hall of Shangyang Palace.

是日,崩於上陽宮之仙居殿,年八十三,謚曰則天大聖皇后。
Location: 舊唐書 卷6 神龍1年 11月

New Book of Tang (Xin Tangshu), Annals · AD 705 · 洛陽

Empress Wu died in the Shangyang Palace.

十一月,崩,謚曰大聖則天皇后
Location: 新唐書 卷004 則天·中宗 神龍1年11月

Place: 洛陽

Show on the map — open Old Book of Tang (Jiu Tangshu), Annals