The city is conducting a tax review of places of worship to assess the primary uses of church buildings.
The details of the review are coming to executive council today.
Places of worship are typically exempt from paying taxes, but many of the 150 buildings scattered around the city have not been inspected for years.
How is church space used
"Inspections of exempt properties have historically been of a lower priority than taxable properties," the report said.
"Some of these properties have not been inspected in decades."
'Presently, the assessment records may only possibly identify residential portions of properties.' - Report to Executive Commitee
The city plans to start on-site inspections this year.
The information collected could highlight income from the properties that is not connected to their role as a place of worship.
The questionnaire going to the building owners will ask for information on how often the property is available for public rent, the frequency of use and the total actual rent.