To me there are two questions:
1. Am I greatly inconveniencing a particular person for no justifiably important reason? If yes, don’t park. If no, then,
2. How likely is it that there will be ramifications either legally (eg ticket or towing) or morally (eg chillul hashem or altercation). This is a hefsed aveira kineged schara type analysis.
As a general rule, when in doubt, absent significant exigency, don’t park. My rule of thumb.