We know that Structure 5D-46 was the palace of Chak Tok Ich'aak because he is named in the inscription on a vessel that was cached under the stairs when the building was dedicated.
The three glyphs on this section of the lid of the cache pot read "holy building, Chak Tok Ich'aak, Tikal Lord". Sylvanus Morley Museum, Tikal. Photo: Mark Van Stone.