You could probably rent a car from Avis/Hertz/etc. for a weekend 2 or 3 times a month and still be paying less than you are for insurance/maintenance/parking.

Yes, it's a bit extra work to go pick up a rental when you need it, but it's way less stress than worrying about parking or break-ins on unexpected maintenance.

Source: have lived in DTJC since 1995 without a car; had one, but it was broken into twice and then stolen and all we ever used it for was the occasional trip to the shore. No car is muuuuch nicer.