Not sure of your exact driving needs, but there are many new options for renting cars. You may not need to keep the same car all day and night. Have you considered just renting on an hourly or daily basis? A zip car or car to go membership may be cheaper than one night parking, and then you can just drop off and pick up cars as needed. There may be another option that works rather than the traditional. Also check into car sharing. There are many people who live here that rent out their cars on daily basis.