I'm looking to replace my boiler and I need some advice. I'm in Toronto, in an older (1940s built) house. My house sits on my neighbour's property line. My current boiler vents up the chimney, but I'd like to move to sidewall venting to reduce potential CO issues.

See pictures (x3): http://imgur.com/a/u0gew

Some contractors told me that the best solution (based on space constraints) is to vent onto/above my neighbour's driveway. But according to CSA B149.1-05 section 8.14.8 "a vent shall not terminate directly above a paved sidewalk or paved driveway that is located between two single-family dwellings and serves both dwellings". Granted, the driveway does not serve BOTH dwellings, but I don't see why it suddenly becomes okay if it just serves one.

My question to you guys: Can I legally vent onto/above my neighbour's driveway? Based on the pictures I provided, do you see a potentially better solution?