Describe the annex in as much detail as you can

Answer: The Annex was the hiding place for Anne Frank and her family foe 2 years until the green police or the nazis found them.

Add as an extra or subordinate part, especially to a document.

"the first ten amendments were annexed to the Constitution in 1791"

2.

add (territory) to one's own territory by appropriation.

"the left bank of the Rhine was annexed by France in 1797"