The building is free-standing and rests on wooden piles; the foundation vaults can be viewed by boat from the canal water underneath the synagogue. The entrance to the main synagogue is off a small courtyard enclosed by low buildings housing the winter synagogue, offices and archives, homes of various officials, the rabbinate, a mortuary, and noted Etz Hayim library. The interior of the synagogue is a single, very high rectangular space retaining its original wooden benches. The floor was covered with fine sand, in the old Dutch tradition, to absorb dust, moisture and dirt from shoes and to muffle the noise. Only five synagogues in the world had a sand floor, and this was the only one with such a floor surviving outside the Caribbean region.