Sorry to inform you, but it isn't your parking space; residents don't actually own the 12 feet under their vehicles. Street parking is a privilege, not a right.
I am aware that I don't personally "own" the streets, but thank you for your comment. And BTW, I used the word "our" - as in the community's spaces. As a taxpayer and resident of this State for the past 45 years, I know that the streets are public property. I have issues with giveaways of public property to private companies - as do the Courts (see the most recent ruling declaring as void the plan to give away public property near Citifield to private developers).
If a public parking space -- something that I support with my tax dollars -- is given to Citibike, then I absolutely see the benefit even though I personally never use the service since I never learned how to ride a bike. A bike is used instead of a car, reducing emissions and traffic in the area and having a positive impact on the health and well being of those using the program, who will be exercising while commuting. Good stuff all around.
If public space is taken and given away to Zipcars, Hertz, Avis, Alamo and similar companies, then I find fault as these companies have enough resources to purchase space in garages, leaving the parking spaces available not only to community residents, but to visitors who would come and shop in our district. The sole "benefit" is that someone will avoid walking to a garage to grab a car. Emissions will still be spewed, no health or traffic benefits will be had, and some nice, big corporations will get to increase their bottom line all at taxpayer expense.
You may want a Zipcar, and you should have a Zipcar. Then walk to the neighborhood Zipcar garage, where Zipcar pays to house its cars, and get a Zipcar.