What is Side Lot Ribbon?
Side Lot Ribbon meaning A side lot ribbon is an 8 to 10 foot wide strip that extends along the length of the side lot line of a zoning lot. It is not required to be open to the sky and can extend through an attached house set along the side lot line. In R3, R4 and R5 districts, if a zoning lot is less than 35 feet wide, parking must be located in a side lot ribbon.
reference: Glossary of Planning Terms – NYC Planning