Planning commission backs 30‑unit Mount Diablo project, citing density bonus and design tweaks

The Lafayette Planning Commission on March 2 voted 4‑0 to recommend that the City Council approve a revised mixed‑use development at 3458 Mount Diablo Boulevard that would create 30 condominium units and two ground‑floor commercial spaces.

Staff described the project as a state density‑bonus application seeking design review, a major subdivision, grading and tree permits. “This is a request for a state density bonus and design review, major subdivision, [and] grading permit,” staff said during the presentation, noting the proposal now shows 30 units (27 market‑rate and three below‑market‑rate), a height request of 62 feet 3 inches and several waivers for setbacks and tree replacement requirements.

Why it matters: The proposal relies on state density‑bonus provisions to increase allowable units and to request local waivers and one concession for the distribution of affordable‑unit bedroom sizes. That mix — three two‑bedroom BMR units and no three‑bedroom BMR — drew repeated questioning from commissioners concerned about family‑sized affordable housing.

Architects for the applicant said changes since earlier reviews include reduced visual bulk through upper‑level stepbacks, simplified facades and replacing metal panels with cement plaster. “We removed these facade bands … to give calmer massing and a more unified appearance,” architect Gertz Frank said while showing updated renderings and plans meant to increase street activation with two commercial tenant spaces.

Commissioners’ questions focused on accessibility and stormwater. Commissioner Mason asked staff and the applicant to locate van‑accessible parking on plan sheets and to justify a proposed reduction in a drive‑aisle width from 26 to 24 feet; the applicant showed van spaces on the ground floor and said 24 feet is standard in many cities. Staff and the city engineer described two stormwater options; staff and the design review commission favored Option 1, which places treatment facilities along 2nd Street and follows the site’s natural drainage, but would remove three on‑street parking spaces.

Affordable‑housing tradeoffs: Vice Chair Deming and other commissioners pressed why the below‑market‑rate units are all two‑bedroom and are concentrated near the parking level rather than dispersed. The applicant’s representative said constructability and stacking constraints made a three‑bedroom BMR impractical on the tight site and that the project is using its single allowable concession under state law for bedroom distribution.

The motion and next step: Commissioner LaBonge moved to adopt resolution 2026‑02 recommending city council approval subject to the conditions in Exhibit A; Commissioner DiGiorgio seconded. Chair Radnich called the vote; the motion passed 4‑0 with Vice Chair Deming absent. The commission’s action forwards the project to city council, which will consider the recommended conditions and the requested waivers.

What’s next: The project will appear before the city council for final entitlement decisions and any council‑level review of the requested waivers and concession. The planning commission record notes that certain concessions (e.g., bedroom distribution) may require council approval under state density‑bonus procedures.