08.10.2026-ASCC Meeting Agenda Packet

TOWN OF PORTOLA VALLEY Architectural & Site Control Commission Field Meeting Monday, August 10, 2026 4:00 PM 1 Tynan Way, Portola Valley, CA An Architectural Site Control Commission field meeting has been scheduled at the site. This meeting is informational, there will be no decision at this meeting. The public is welcome to attend this meeting at the site. Architectural & Site Control Commission Meeting Monday, August 10, 2026 7:00 PM Hybrid Meeting Danna Breen, Chair Gina Dixon, Vice Chair Carter Warr, Commissioner Lance Vaughan, Commissioner Sonia Dhillon, Commissioner A G E N D A HISTORIC SCHOOLHOUSE - 765 Portola Road, Portola Valley, CA 94028 Remote Public Comments: Meeting participants are encouraged to submit public comments in writing in advance of the meeting. Please send an email to scawrse@portolavalley.net and cc the Town Clerk at pvtownclerk@portolavalley.net by 12:00 PM on the day of the meeting. All comments received by that time will be distributed to Commissioners prior to the meeting. All comments received are included in the public record. Time permitting, your correspondence will be uploaded to the website. Additionally, technology permitting, the public body will take questions using the Raise Hand button for those who attend the meeting online or by phone. Phone callers may provide comments by pressing *9 on their phone to "raise your hand" and *6 to mute/unmute themselves. The meeting Chair will call on people to speak by the phone number calling in. Remote participation is provided as a supplemental way to provide publi c comment, but this method does not always work. The public is encouraged to attend in person to ensure full participation. Assistance for People with Disabilities: In compliance with the Americans with Disabilities Act, if you need special assistance to participate in this meeting, please contact the Town Clerk at (650) 851-1700 or by email at towncenter@portolavalley.net. Notification 48 hours prior to the meeting will enable the Town to make reasonable arrangements to ensure accessibility to this meeting. VIRTUAL PARTICIPATION VIA ZOOM To access the meeting by computer: https://us06web.zoom.us/j/89424958620?pwd=2PblMYUqWhWIDpLaBrTyZzvyNSp9Df.1 Webinar ID: 894 2495 8620 Passcode: 720427 To access the meeting by phone: 1-669-444-9171 Mute/Unmute – Press *6 / Raise Hand – Press *9/Unmute – Press *6 / Raise Hand – Press *9 1 Town of Portola Valley – ASCC Meeting Agenda August 10, 2026 Page 2 Land Acknowledgement: The Town of Portola Valley acknowledges the colonial history of this land we dwell upon the unceded territory of the Ramaytush (rah-my- toosh) Ohlone, Tamien Nation, and Muwekma (mah-WEK- mah) Ohlone, who endured a human and cultural genocide that included removal from their lands and their sacred relationship to the land. Portola Valley recognizes that we profit from the commodification of land seized from indigenous peoples and now bear the ecological consequences. We seek to understand the impact of these legacies on all beings and to find ways to make repair. 1. CALL TO ORDER / ROLL CALL Chair Breen, Commissioners Warr, Dixon and Vaughan SB 707 CONSIDERATIONS: Announcements/Consideration of remote attendance by Councilmembers, pursuant to SB 707, Government Code 54953.8.3 (just cause circumstances). 2. ORAL COMMUNICATIONS Persons wishing to address the Architectural and Site Control Commission on any subject not on the agenda may do so now. Please note, however, that the Architectural and Site Control Commission is not able to undertake extended discussion or action tonight on items not on the agenda. 3. APPLICATIONS FOR REVIEW a. Architectural Review for the demolition of an existing single-family residence, driveway, and impervious site elements, and construction of a new single- family residence at 1 Tynan Way; applicant: Neil Jackson ; property owner: Bill and Sarah Rehlich; APN: 07 6-235-140; File # PLN_ARCH16-2025 / PLN_SITE010-2025 (Nick Martell). 4. REGULAR AGENDA a. Consider Appointment of an Architectural & Site Control Commission Ad Hoc Subcommittee to Prepare a Draft Object Design Standards Research and Analysis Report Summarizing Issues, Needs, and Best Practices. 5. INFORMATIONAL ITEMS a. None Scheduled 6. COMMISSION, STAFF, AND COMMITTEE REPORTS 7. MINUTES a. Adopt Draft Minutes of June 17, 2026 Planning Commission & ASCC Joint Special Meeting b. Adopt Draft Minutes of June 22, 2026 ASCC Meeting 8. ADJOURNMENT AVAILABILITY OF INFORMATION Any writing or documents provided to a majority of the Town Council or Commissions regarding any item on this agenda will be made available for public inspection at Town Hall located 765 Portola Road, Portola Valley, CA during normal business hours. Copies of all agenda reports and supporting data are available for viewing and inspection at Town Hall and at the Portola Valley Library located adjacent to Town Hall. PUBLIC HEARINGS Public Hearings provide the general public and interested parties an opportunity to provide testimony on these items. If you challenge any proposed action(s) in court, you may be limited to raising only issues you or someone else raised at the Public. Hearing(s) described in this agenda, or in written correspondence delivered to the Planning Commission at, or prior to, the Public Hearing(s). 2 ____________________________________________________________ TO: Members of the Architectural and Site Control Commission FROM: Nick Martell, Contract Senior Planner Sarah Cawrse, Planning & Building Director DATE: August 10, 2026 SUBJECT: Architectural Review for the demolition of an existing single-family residence, driveway, and impervious site elements, and construction of a new single-family residence at 1 Tynan Way, Portola Valley; applicant: Neil Jackson; property owner: Bill and Sarah Rehlich; APN: 076-235-140; File # PLN_ARCH16-2025 / RECOMMENDATION: Staff recommend that the ASCC approve the Architectural Review for the renovations and site improvements subject to the conditions of approval (Attachment 1). PROJECT DESCRIPTION Site Information The project site is located at 1 Tynan Way, Portola Valley (APN: 076-235-140). The parcel is approximately 0.89 acres with an average slope of 17.9% and is within the R-1/20M zoning district. The property is served by an on-site septic system. The site is in the “C” Flood Zone, with an SBR Geological Soil Type with relatively stable ground with a thin soil mantle subject to shallow settlement and soil creep. The Geotechnical Investigation (Attachment 5) found the site underlain by Butano Formation bedrock at shallow depth, and concluded the project is geotechnically feasible provided its foundation, grading, and drainage recommendations, including measures addressing moderately expansive near-surface soils are incorporated into the final plans. A 40-foot-wide open space easement runs along a portion of the property. The property contains an existing single-family residence, which is a 1923 log cabin with an attached shed, along with a 2-car garage and storage shed at the eastern edge of the property, which will remain. Project Description STAFF REPORT TOWN OF PORTOLA VALLEY 3 1 Tynan Way August 10, 2026 ASCC Review Page 2 Demolition Phase: The project includes demolition of the existing 1923 log cabin, its attached shed, brick exterior patio walls, brick grill and chimney, wood deck, assorted exterior stairs, retaining walls, slabs on grade, and decomposed granite paths, some of which are within the 40- foot-wide open space easement (Attachment 2). The existing double-access asphalt driveway will also be removed in keeping with the Town's site development standards; it will remain in place until construction is complete to preserve site access during construction (Sheet A1.3, Construction Staging/Access/Tree Protection Plan). The existing 2-car garage and storage shed at the eastern edge of the property will remain, and the existing hot tub will be relocated to the east of the proposed new home. Construction Phase: The applicant proposes a new single-story modern home of 1,824 square feet, with exterior balconies, planters, and trellis, concrete terraces and steps, and a rain/grey- water cistern system. All proposed exterior materials are fire-resistant. The home meets all applicable setback requirements. New exterior and landscape lighting is proposed (Sheet A1.5). Existing site utilities will be reconfigured. A new single-access decomposed granite driveway and concrete steppingstones are pr oposed, with 2 covered and 2 uncovered parking spaces. New landscaping and irrigation, including 5 new California Lilac (Ceanothus T hyrsiflorus) trees proposed to replace 4 significant trees recommended for removal per the arborist report, are shown on Sheets W.1–W.5. Project Data – Proposed Addition Code Requirements Existing Proposed Remaining Max Floor Area 4,348 3,661 3,613 735 85% of MFA 3,696 -- -- -- Max Impervious Surface 5,972 6,526 4,791 1,181 Vertical Height 28'-0" 23'-6" 19'-0" -- Maximum Height 34'-0" 28'-6" 25'-4" -- Front Setback 20'-0" 18'-8" 63'-6" -- Side Setbacks 10'-0" 45'-9" 53'-9" -- 4 1 Tynan Way August 10, 2026 ASCC Review Page 3 Rear Setback 20'-0" 38'-0" 30'-6" -- Creek Setback N/A N/A N/A -- Parking Spaces 2 2 4 -- Design & Exterior Materials - Pool Support Building Architectural Style: Modern Shape & Orientation: The parcel is an irregularly shaped lot which fronts both Tynan Way and Russell Avenue. Roof: CertainTeed Flintlastic SA CAP S8S Modified Roofing Membrane, Color: Resawn Shake (LRV 26). Structure Visibility: Central siting and a single-story form limit visibility and massing as seen from neighboring properties. Exterior Walls: Stucco w/Machine Dash Texture CLR Matte Finish (LRV 25), Weathered Corten STL Columns, Beams, Gutters, RWL’s & Guard Uprights (LRV 10- 25), Formglass GFRC-L “Desert Sand” Sandblasted w/ CLR Matte Finish (LRV 30) Windows & Doors: Multipane with Tempered Glass per 2025 CRC SEC. R324 Safety Glazing. All doors shall be constructed of solid core WD having stiles and rails not less than 1 3/8” w/INT Field Panel Thickness no less than 1 ¼” Thick All proposed materials and treatments meet Town reflectivity guidelines and present a natural color palette. The colors and materials are identified on sheet A 3.3 in the project plans (Attachment 2). Grading Total Soil Movement (cubic yards) Cut Fill Total Building Pad 45 0 45 Pool 0 0 0 Site Work & Landscaping 120 5 125 Site Total 165 5 170 CY Off-Haul: 160 CY (Site Total Cut – Site Total Fill) Site Development Permit (SDP) Overall CY Building Pad Fill + Site Work Cut + Site Work Fill = Soil Movement Subject to SDP 5 1 Tynan Way August 10, 2026 ASCC Review Page 4 0 + 120 + 5 = 125 CY Review level required by soil movement: Geology Review Landscaping Davey Tree (Katelyn Obana, ISA Certified Arborist #WE-13422A) prepared an Arborist Report and Tree Protection Plan dated September 2024, based on a September 25, 2024 site visit (Attachment 3). The report assessed 21 trees in the project's area of impact including 15 Coast live oak, five Redwood, and one Chinese Pistache. It was reported that 16 qualify as significant trees under the Town's Tree Ordinance (PVMC 15.12.070.A). Twenty trees were found to be in fair condition and one in poor condition. Five trees are proposed for removal, Trees #13, # 14, # 16, and #17, and Tree #19 (not of significant size, requiring no permit). Trees #13 and #14 (Redwoods) have root systems that have already displaced adjacent hardscape by 6–12 inches; Tree #16 (Coast live oak) is close enough to the new residence that construction impacts are expected to be high; and Tree #1