RM3 Zone in Portland, OR
RM3 zoning district rules in Portland, OR. Permitted uses, setbacks, height limits, and lot coverage requirements.
The RM3 zone in Portland, OR is a residential district (Residential Mixed Density). Permits a range of residential density from single-family through multi-family, often applied in transition areas between low-density and higher-density zones. This zone requires a 0 ft front setback, 0 ft side setback, and 0 ft rear setback. Maximum building height is 100 feet (8 stories).
Common Permitted Uses
- Single-family homes
- Duplexes
- Small apartment buildings
Permits a range of residential density from single-family through multi-family, often applied in transition areas between low-density and higher-density zones.
Setback Requirements
| Setback Type | Requirement |
|---|---|
| Front Setback | 0 feet |
| Side Setback | 0 feet |
| Rear Setback | 0 feet |
RM3/RM4: High-density multifamily and mixed-use corridors. No minimum setbacks — build-to-line requirements may apply. Portland Zoning Code 33.120.220.
Height Limits
- Max Height
- 100 feet
- Max Stories
- 8
RM3 zone. Portland Zoning Code 33.120.215. Mid-rise multifamily.
Parking Requirements
Single-family: 1 off-street parking space per dwelling unit in R20, R10, R7 zones. No minimum parking required in R5 or R2.5 zones or within 500 ft of a frequent service transit line per Portland Zoning Code 33.266. Multi-family: No minimum parking required in RM zones per Portland's 2019 parking reforms. Multifamily projects may provide parking voluntarily. Portland eliminated parking minimums in all RM zones and most commercial zones.
Source: Portland City Code Title 33, Section 33.205 — Accessory Dwelling Units; Oregon Revised Statutes 197A.420 (HB 2001 codification). Last verified April 5, 2026. View source