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Created to accommodate towers facing elevated rail lines, R9D districts produce tall buildings set back from the street line to minimize train noise for occupants of the buildings and maximize light and air for pedestrians at street level. Portions of the River Avenue corridor around 161st Street in the Bronx are mapped C6-3D which has an R9D residential district equivalent.

The tower portion of the building must be set back at least 20 feet from the street line when facing an elevated rail line. In C6-3D districts, the tower must rise above a low base set at the street line that is between 15 and 25 feet high. A setback is not required when a building wall is within 70 feet of a street intersection.

The floor area ratio (FAR) is 9.0. There is no maximum building height in an R9D district but special rules control the width of towers and ensure articulated tower tops for the highest four stories or that portion of the building above 165 feet, whichever is less.

In C6-3D districts or when a commercial overlay is mapped in an R9D district, the ground floor of a building must be reserved for retail and service uses in order to maintain a lively streetscape. Sidewalks adjacent to wide streets, or elevated rail lines must have a minimum depth of 20 feet.

Buildings must have interior amenities for residents pursuant to the Quality Housing Program.

Off-street parking is required for at least 40% of dwelling units.