Division B, 9.10.11.2. Firewalls Not Required

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Division B, 9.10.11.2. Firewalls Not Required
2) Where a building of residential occupancy contains more than 2 houses, a party wall that separates any 2 adjacent houses with a secondary suite from the rest of the building shall be constructed as a firewall to create separate buildings each containing no more than 2 adjacent houses with a secondary suite.
Design tricks:
Existing rowhouse with 3 or 4 units is not eligible to have a secondary suite.