Alice,
It is a forum for advice.
As I said, if you are living in an Association, your governing documents may require that vehicles have proper registration and license.
If you are not in an Association, then, as others have said, typically the requirement of license, insurance, etc. is on vehicles that are operated on the roadways.
Here is a link to the NY State Vehicle and Traffic Code:
http://codes.lp.findlaw.com/nycode/VAT However, the city or County may have additional requirements. The internet, your local library, the DMV or your local police station may be of assistance in finding the specific laws that apply.
Keep in mind that even if State, County or City laws don't require license and registration, your Association may require it. Therefore, you simply may want to keep the vehicle within your garage (if you have one)