With the apparent approval of the king, ha-Levi defied the laws that required synagogues to be smaller and lower than churches and plain of decoration. The prayer hall is rectangular and measures 23 × 9.5 meters (roughly 75.5 feet × 29.5 feet) and has a 12-meter-high ceiling (close to 40 feet). The prayer hall features Nasrid-style polychrome stucco-work, multifoil arches, a massive Mudéjar artesonado ceiling, Hebrew inscriptions praising the king and ha-Levi himself, Arabic inscriptions, and quotations from the Psalms. The stucco-work, arches, and ceiling were made in the style of the Nasrid palace of Alhambra. There were also Christian elements in the architecture that mixed muqarnas ornament with heraldry and vegetal motifs that were common among Christian and Islamic buildings as well as in  synagogues of the time. The ornamentation also bears the ha-Levi coat of arms, a borrowing of Christian architectural customs. Arabic inscriptions surround the prayer room and are intertwined with the floral patterns in the stucco. They are in Kufic-style script and include positive devotional affirmations and praises of God common in Islamic architecture. All along the prayer hall are large larchwood frames made with inlaid carved polychrome of ivory.