Where a district boundary line is shown as following the street line boundary, the boundary line will be changed automatically whenever said street line or right-of-way is changed, provided that the change does not exceed 20 feet.

Where a district boundary line is shown as following a lot line, such lot line shall be construed to be said district boundary.

Where a district boundary line is shown as parallel to a street, highway or railroad line, such district boundary shall be construed as being parallel thereto and at such distance from the nearest right-of-way line thereof as indicated on the Zoning Map, measured at right angles where street line is straight, radially where street line is curved.

In cases of doubt, the district boundary lines shall be determined by the Board of Adjustment in accordance with N.J.S.A. 40:55D-70b.

R-7.5 Residence District: to provide an area for high-density, single-family detached units, which are consistent with development patterns within the district.

R-15 Residence District: to provide an area for moderate to low-density, single-family detached units which are compatible with the capacity of the land and consistent with the development within the district.

R-25 Residence District: to provide an area for moderate-density, single-family detached units with consideration of the environment and development patterns in surrounding areas.

R-35 Residence District: to provide an area for lower-density, single-family detached units which are compatible with the physical development capacities of the land within the same district.

R-40 Residence District: to provide an area for low-density, single-family detached units which are compatible with the physical development capacities of the land and consistent with development patterns within the same district.

R-120 Residence District: to provide an area for low-density, single-family detached units which are compatible with the physical development capacities of the land considering topography and other natural conditions and characteristics.

PRD Planned Residential District: to provide for the comprehensive, coordinated development of contiguous tracts of land for multifamily cluster development that promotes more balanced, environmentally acceptable use of land which encourages contemporary land use desire and conservation of open space; that provides for development which does not adversely impact the Borough regarding traffic flow, recreational facilities and other municipal services; and that provides for a variety of housing accommodations which are compatible with a modern way of life and enhances the natural beauty and resources of their surroundings.

MF-O Multifamily-Overlay: to provide for the comprehensive and coordinated development of certain contiguous lands for multifamily use in a variety of housing styles which respond to current housing needs while preserving wetlands and associated open space and to provide for development which does not adversely impact the Borough. This section acknowledges that the New Jersey Residential Site Improvement Standard regulates new residential development.

ARD Adult Residential Development: to provide adequate housing at an affordable cost to serve the unique needs of the adult population with regard to the design of such housing and relationships to passive open space, proximity to shopping areas and recreational opportunities.

PO Professional Office: to provide a district for the conduct of professional practices and business office uses with consideration of the surrounding residential uses and traffic patterns to serve the Borough and surrounding communities.

CB Community Business: to provide a district for the conduct of retail businesses, offices, professional practices and personal services, with consideration of existing commercial business and traffic patterns, to serve the Borough and surrounding communities.

CRD Community Redevelopment District: to encourage the comprehensive redevelopment of the Borough's primary neighborhood business district. Future development encourages the creation of larger lots from several smaller parcels and the development of an overall scheme of the District. To this end, easements for traffic flow and parking, as well as the vacation of appropriate Borough rights-of-way, are fostered. In addition, the Planning Board shall encourage colonial architectural design for development and redevelopment with the district.

HB Highway Business: to serve a complementary function with the Community Business District in providing the services and goods for the Borough and surrounding communities. The Highway Business District is intended to provide a district serving the region, requiring larger facilities, large parking areas and served by high traffic arteries, such as Route 23. The criteria for the district are intended to promote safe and efficient development along the high traffic artery, Route 23.

I Industrial: to provide within the Borough a district for industrial development to serve the Borough's and the region's needs. The district will provide employment for the needs of the Borough and the region and industrial use compatible with and enhancing the surrounding uses.

IQ Industrial Quarry: is intended where single ownership of a minimum of 10 acres will provide for a planned industrial area. The area is planned to provide industrial properties requiring larger tracts with the accompanying increased traffic patterns and parking areas.

AHO Affordable Housing Overlay District: to provide development that contributes to the Borough of Riverdale's municipal affordable housing obligation, while allowing developers increased flexibility to provide more residential units when a required on-site affordable housing set-aside is provided.

AH-PRD-2 Affordable Housing Planned Residential District - Affordable Housing Planned Residential District 2: to address the Borough's affordable housing obligation by providing an increased density with a mandatory affordable housing setaside through at comprehensive and coordinated development of property for townhouse use, within the context of a design that promotes a balanced, environmentally acceptable development that does not adversely impact the Borough and provides for a type of housing that is compatible with current housing needs and complements the surrounding development pattern.