Building number 1 as it is called, the one with the terrace on the top on the picture, is definitely the most interesting out of the 2. It is much bigger and the collection, I found, easier to understand and more approachable. I thought this one was impressive: it is views of street walls in Palestine.
On the 2nd floor there is a small library, specialised in arts of course. They have a small selection is Arabic, English and French.