High-density apartment district: 735 sq ft of lot per unit, up to 60 du/ac, with limited ground-floor retail and office allowed when built into the residential building.
What's allowed in RHD-B
| Use | Status | What that means |
|---|---|---|
| Single-family home | Not allowed | not allowed (excluded by the use list or by definition) |
| 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) | Not allowed | not allowed (excluded by the use list or by definition) |
Lot and building standards
| Standard | Value | Code section |
|---|---|---|
| Minimum lot area (first units) | 735 sq ft | §656.307.A.II(d) |
| Units covered by that minimum | 1 | |
| Lot area per additional unit | 735 sq ft | §656.307.A.II(d) |
| Maximum density | 60 units/acre | §656.307.A.II(d) |
| Minimum lot width | — | |
| Maximum height | 60 ft | §656.307.A.II(g) |
| Maximum lot coverage | 80% | §656.307.A.II(e) |
How many units can a lot hold in RHD-B?
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 | 6 | 735 sqft for the first 1 unit(s) + 735 sqft per additional |
| 7,500 sq ft | 10 | 735 sqft for the first 1 unit(s) + 735 sqft per additional |
| 10,000 sq ft | 13 | 735 sqft for the first 1 unit(s) + 735 sqft per additional |
| 15,000 sq ft | 20 | 735 sqft for the first 1 unit(s) + 735 sqft per additional |
| 21,780 sq ft (½ acre) | 29 | 735 sqft for the first 1 unit(s) + 735 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 uses (§656.307.A.II(a)): multiple-family dwellings; neighborhood retail, service or office structurally integrated with multi-family, up to 25% of floor area. Single-family is not a permitted use. A duplex is a multiple-family dwelling by definition (§656.1601). Townhomes are not expressly listed. Lot area: 735 sq ft for each family unit, not to exceed 60 units per acre (§656.307.A.II(d)). Height: 60 ft; unlimited if all yards increase 1 ft per 3 ft above 60 (§656.307.A.II(g)(2)). §656.307 gives no minimum lot width. Secondary-district criterion: site must front a collector or higher (§656.350(g)). The ADU rule (§656.403(g)) requires a principal single-family dwelling, so ADUs are effectively not available.
Compiled from the official code text (§656.307). 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.