Setback Requirements for Office and Institution Districts in Raleigh

In the City of Raleigh, O&I-3 (Office and Institution-3) is classified as a Legacy District that is being phased out in favor of new Unified Development Ordinance (UDO) categories. While specific dimensional tables for legacy districts are maintained in the older Part 10 Zoning Code, the City of Raleigh UDO establishes that its modern setback regulations are controlling whenever they are more stringent than existing legacy conditions [Section 1.2.3, Section 1.3.4].

Status of the O&I-3 Legacy District in Raleigh

The O&I-3: Office and Institution-3 district is designated as a "Legacy District" under the City of Raleigh Unified Development Ordinance. According to the code, no new legacy districts may be added to the Official Zoning Map, and existing boundaries for the O&I-3 district cannot be modified [Section 1.3.4].

When interpreting regulations for these areas, the City of Raleigh applies the following rules:

UDO Primacy: UDO regulations for setbacks, height, and landscaping are controlling when they are more stringent than those found in a conditional legacy zoning ordinance [Section 1.2.3].
Transition to UDO Districts: Legacy districts like O&I-3 will eventually be replaced entirely by modern UDO zoning districts such as Office Park (OP-) or Office Mixed Use (OX-) [Section 1.3.4].

UDO Setback Standards for Office and Institutional Buildings

Because the City of Raleigh UDO standards are controlling, development within a legacy Office and Institutional area must generally align with the base dimensional standards for the modern Office Park (OP-) and Office Mixed Use (OX-) districts. The most common building type for these uses is the "General Building."

Setbacks for General Buildings in Office Districts

The following setbacks apply to General Buildings (structures accommodating nonresidential uses on all floors) within the City of Raleigh office-related districts [Section 3.2.5]:

Standard	Office Park (OP-)	Office Mixed Use (OX-)
Primary Street Setback (min)	5 feet	5 feet
Side Street Setback (min)	5 feet	5 feet
Side Lot Line (min)	0 feet or 6 feet	0 feet or 6 feet
Rear Lot Line (min)	0 feet or 6 feet	0 feet or 6 feet
From Alley (min)	5 feet	5 feet

Setbacks for Mixed Use and Civic Buildings

If the institutional use is housed in a Mixed Use Building or a designated Civic Building, the City of Raleigh enforces slightly different minimums [Section 3.2.6, Section 3.2.7]:

Standard	Mixed Use Building (OP/OX)	Civic Building (OP/OX)
Primary Street Setback (min)	5 feet	10 feet
Side Street Setback (min)	5 feet	10 feet
Side Lot Line (min)	0 feet or 3 feet	0 feet or 6 feet
Rear Lot Line (min)	0 feet or 3 feet	0 feet or 6 feet

Neighborhood Transitions and Encroachments

In the City of Raleigh, minimum setbacks may be increased if the O&I-3 or modern Office district property immediately abuts a residential district (R-1, R-2, R-4, R-6, or R-10). These "Neighborhood Transitions" require protective yards and restricted zones (Zones A and B) that can extend up to 50 feet from the property line, effectively increasing the building setback to protect residential character [Section 3.5.1, Section 3.5.2].

Certain building features are permitted to encroach into these required setbacks in the City of Raleigh, such as:

Cornices and sills: May project up to 1.5 feet [Section 1.5.4].
Building eaves and awnings: May extend up to 5 feet into a required setback [Section 1.5.4].
Handicap ramps: May project to the extent necessary to perform their proper function [Section 1.5.4].

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