Plans to expand the Gate David synagogue were approved by the Plateau Mont Royal borough Monday night.
Critics of the plan say the expansion will lower the standard of living in the area.
Some call the synagogues on Hutchison Street noisy and a nuisance, claiming that they attract illegal activity.
But the mayor of the Plateau insists the ultra Orthodox community has not broken any rules.
Other residents in the area say that accepting diversity is part and parcel of living on the street.
Opponents may ask for a referendum on the expansion plans. And so it may be months before the community knows it will receive its building permit or not.