score:3
If it's on the street, it's usually fine, provided you're not blocking anyone in, if it's on the parking lot next to the garage, this is probably private property and you can't park on it.
In terms of communities to ask, as canonacer mentioned, use a local Facebook group or sign up to nextdoor.com.
You can find plenty of apps online by googling "Rent a parking space" where you will be able to pay your neighbour per day/week/month to use a space available on a private property. Just ensure they have permission to rent the space.