I just read the article in wikipedia, which stated that Cordoba was “conquered” by a Muslim army in 711 and turned into a caliphate. Because it was established so close to Catholic strongholds, it hoped for “interfaith tolerance”, certainly. But, again, notice that the edge of the Islamic empire is the locale of the interfaith tolerance, and it was only established by force.
I have little opinion of Imam Rauf. He seems nice. He is polished, and he speaks against “extremists”. He does not, however, condemn Hamas, nor does he or anyone else have any assurance of what will happpen in the future when new blood takes over the Cordoba project.