SB 1211 for 6-unit apartment in Rancho Cucamonga
Own a 6-unit apartment in Rancho Cucamonga? SB 1211 lets you stack 7 new units on top of your existing 6: 6 detached + 1 interior. At Rancho Cucamonga's median rent of $2,100/mo, that's ~$176K in additional gross annual rent.
The Rancho Cucamonga scenario
Picture the typical case: a 6-unit 6-unit apartment on a Rancho Cucamonga block built between 1955 and 1975, with surface parking that hasn't been fully utilized in years. SB 1211 turns that parking into 6 detached units plus 1 interior conversion — 7 new doors that didn't exist before 2024.
Rancho Cucamonga watch: Inland Empire upper market.
Mid-size multifamily (5–8 unit) design playbook
This is SB 1211's sweet spot. A 6-unit existing building maxes out the 8-detached cap (or comes close), so design moves are about packing detached ADUs efficiently around the existing structure and converting underutilized parking.
Pro-forma snapshot
| Existing units | 6 |
| Detached ADUs (SB 1211) | 6 |
| Interior conversions | 1 |
| Total new units | 7 |
| Median 1BR rent in Rancho Cucamonga | $2,100/mo |
| Est. additional gross rent | $176K/yr |
| Estimated total project cost | ~$1,725K |
| Year-1 NOI estimate | ~$132K |
| Stabilized cap rate at cost | 7.7% |
| Replacement parking required | No (§66313) |
| Approval pathway | Ministerial · §66314 |
| Typical permit timeline in Rancho Cucamonga | 60-100 days |
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