Hard to say, without knowing the specific location. The alley could be zoned as city property, in which case it doesn't matter whose permission you get; you aren't getting it from the city. Some 'alleys' are actually assumed roads, like Okeefe Lane running along the side of Ryerson University's Jorgenson Hall. That means all of the normal on-street parking rules apply.
Read the section titled "Parking offences that do not require signs": http://www.toronto.ca/transportation...egulations.htm
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