shared driveway

[David Tucker]

I live in a single family and am now sharing our driveway with a 2 family. When we purchased the property the now 2 family was zoned a single family residence. Recently the town allowed the owner to zone the property as a 2 family and there are 7 or so cars at the 2 family residence. Our maintenence agreement doesn't cover 2 family maintenance responsibility. Am I still responsible for 1/2 the maintence or is it now 1/3 2/3? Was it legal for our town to change the zoning without considering the shared drive?