SB 1211 for 8-unit apartment in Walnut Creek
Own a 8-unit apartment in Walnut Creek? SB 1211 lets you stack 10 new units on top of your existing 8: 8 detached + 2 interior. At Walnut Creek's median rent of $2,700/mo, that's ~$324K in additional gross annual rent.
The Walnut Creek scenario
Picture the typical case: a 8-unit 8-unit apartment on a Walnut Creek block built between 1955 and 1975, with surface parking that hasn't been fully utilized in years. SB 1211 turns that parking into 8 detached units plus 2 interior conversions — 10 new doors that didn't exist before 2024.
Local tip for Walnut Creek: Tree preservation ordinance can affect placement.
Mid-size multifamily (5–8 unit) design playbook
This is SB 1211's sweet spot. A 8-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 | 8 |
| Detached ADUs (SB 1211) | 8 |
| Interior conversions | 2 |
| Total new units | 10 |
| Median 1BR rent in Walnut Creek | $2,700/mo |
| Est. additional gross rent | $324K/yr |
| Estimated total project cost | ~$2,464K |
| Year-1 NOI estimate | ~$243K |
| Stabilized cap rate at cost | 9.9% |
| Replacement parking required | No (§66313) |
| Approval pathway | Ministerial · §66314 |
| Typical permit timeline in Walnut Creek | 75-120 days |
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