They can park their car at any TTC lot in town, there are several to choose from, likely one convenient to their needs.
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Just to build on this...........there are two types of visitor parking demand, as I see it.
The first, is discretionary. This is the vast majority of demand. People who face little or no obstacle, physical or financial to arriving by some means other than a car; or who can easily to choose to park at a nearby paid facility and walk the 1, 2 or 3 blocks to the home of their friends or family.
The second is people who either face a material obstacle, to using transit/walking etc.in every day circumstances, and/or have a special situation (piled high w/gifts for a birthday or Christmas or the like).
I'm not unsympathetic here. In the latter days of my mother's life, she faced both physical, and cognitive challenges that made it near impossible for her to travel w/o me, or travel any distance on her own (COPD and dementia, in the form of short-term memory loss and some disorientation).
To be blunt, that sucks, for the person experiencing it, as well as for any friend/family member who needs to help. That said; such circumstances are comparatively rare, thankfully.
They are also addressable in any number of ways.
That some of these are less than optimal is to be charitable................but the idea that a few more parking spots is the solution, is at best, overly simplistic.
Nonetheless, if the argument is for a few spaces (literally a handful) for those w/exceptional needs; I'm very much open to that. If the argument is for spaces for those who don't NEED them, that's a bit less persuasive.