Small-scale office and residential district. Multi-family is allowed by right at the same 6,000 + 2,100 sq ft lot-area formula as CRO, with a 35 ft height cap.
What's allowed in RO
| Use | Status | What that means |
|---|---|---|
| Single-family home | Allowed | listed as a permitted use |
| Duplex / two-family | Allowed | listed as a permitted use |
| Townhouse | Not listed | not expressly listed; may or may not fall under a broader listed use; verify with planning staff |
| Multi-family (3+ units) | Allowed | listed as a permitted use |
| Accessory dwelling unit (ADU) | Accessory only | allowed only as an accessory use under conditions (e.g. COJ ADU rule §656.403(g)) |
Lot and building standards
| Standard | Value | Code section |
|---|---|---|
| Minimum lot area (first units) | 6,000 sq ft | §656.311.A.IV(e)(2)(ii) |
| Units covered by that minimum | 2 | |
| Lot area per additional unit | 2,100 sq ft | §656.311.A.IV(e)(2)(ii) |
| Maximum density | 20 units/acre | §656.311 (category preamble) |
| Minimum lot width | 50 ft | §656.311.A.IV(e)(1)(ii) |
| Maximum height | 35 ft | §656.311.A.IV(i)(1) |
| Maximum lot coverage | 50% | §656.311.A.IV(f) |
How many units can a lot hold in RO?
Applying the district's lot-area and density rules (the stricter one wins) to typical lot sizes:
| Lot size | Max units | Rule that limits it |
|---|---|---|
| 5,000 sq ft | 1 | lot 5,000 sqft is under the 6,000 sqft minimum (nonconforming) |
| 7,500 sq ft | 2 | 6,000 sqft for the first 2 unit(s) + 2,100 sqft per additional |
| 10,000 sq ft | 3 | 6,000 sqft for the first 2 unit(s) + 2,100 sqft per additional |
| 15,000 sq ft | 6 | 6,000 sqft for the first 2 unit(s) + 2,100 sqft per additional |
| 21,780 sq ft (½ acre) | 9 | 6,000 sqft for the first 2 unit(s) + 2,100 sqft per additional |
Multi-unit numbers only matter where duplexes or multi-family are allowed above. In Jacksonville the Future Land Use Map category can cap density further, and overlays (Riverside/Avondale, San Marco, Springfield and others) can change the numbers.
Notes from the code
Permitted (§656.311.A.IV(a)): professional and business offices; multiple-family dwellings; single-family dwellings; others. Lot rules (§656.311.A.IV(e)): single-family 50 ft / 5,000 sq ft; multi-family 50 ft and 6,000 sq ft for the first two family units plus 2,100 sq ft per additional unit. Coverage 50% (§656.311.A.IV(f)). Principal structures 35 ft (§656.311.A.IV(i)(1)). Under (j), these rules apply unless a zoning overlay (e.g. Riverside/Avondale, San Marco) says otherwise. Density: see CRO notes (20 du/ac in the §656.311 preamble). ADU allowed as an accessory use to a conforming single-family dwelling under §656.403(g): behind the primary structure, footprint <= lesser of 25% of principal GFA or 750 sq ft, not in a required yard, and the property must hold (or have applied for) a homestead exemption. That last condition rules out ADUs on non-homestead investor-owned parcels.
Compiled from the official code text (§656.311). Zoning changes by ordinance and parcels can be rezoned — confirm on the official zoning map and with Jacksonville planning staff before you rely on it. Not legal advice.