Block 20 Mixed-Use Project


SCH Number
Lead Agency
City of San Mateo
Document Title
Block 20 Mixed-Use Project
Document Type
NOP - Notice of Preparation of a Draft EIR
Present Land Use
Present Land Use: Commercial and residential General Plan Land Use Designation: Downtown Retail Core Support Zoning: Central Business District Support
Document Description
The project proposes to demolish all existing structures, including the two historic structures at 415 S. Claremont Street and 503 E. 5th Avenue, and redevelop the site with a new six-story, approximately 209,955 square-foot mixed-use building with two levels of below grade parking. The building would be approximately 75 feet in height and would consist of 137,912 square feet of office space, approximately 1,574 square feet of commercial space (likely to be used as a café), and approximately 86 multi-family residential units. The ground level would include the retail space, a residential lobby, and office space. The second and third floors would consist entirely of office space, while the fourth and fifth floors would include a mix of office space and residential units, and the sixth floor would consist entirely of residential units and rooftop mechanical equipment.

Contact Information

Rendell Bustos
Agency Name
City of San Mateo
Job Title
Senior Planner
Contact Types
Lead/Public Agency


San Mateo
San Mateo
Cross Streets
E. 4th Avenue, S. Delaware Street, E. 5th Avenue, S. Claremont Street
Total Acres
Parcel #
034-186-080, 034-186-070, 034-186-060, 034-186-090, and 034-186-110
State Highways
101, 82, 92
Sunnybrae Elementary, College Park Elementary, San Mateo High
San Mateo Creek, Leslie Creek, Seal Slough, Borel Creek

Notice of Completion

State Review Period Start
State Review Period End
State Reviewing Agencies
California Air Resources Board (ARB), California Department of Conservation (DOC), California Department of Fish and Wildlife, Bay Delta Region 3 (CDFW), California Department of Fish and Wildlife, Marin Region 7 (CDFW), California Department of Forestry and Fire Protection (CAL FIRE), California Department of Parks and Recreation, California Department of Resources Recycling and Recovery, California Department of Water Resources (DWR), California Highway Patrol (CHP), California Natural Resources Agency, California Public Utilities Commission (CPUC), California Regional Water Quality Control Board, San Francisco Bay Region 2 (RWQCB), California State Lands Commission (SLC), Department of Toxic Substances Control, Office of Historic Preservation, San Francisco Bay Conservation and Development Commission (BCDC), State Water Resources Control Board, Division of Drinking Water, State Water Resources Control Board, Division of Drinking Water, District 17, State Water Resources Control Board, Division of Water Quality, California Native American Heritage Commission (NAHC), California Department of Transportation, District 4 (DOT)
State Reviewing Agency Comments
California Native American Heritage Commission (NAHC), California Department of Transportation, District 4 (DOT)
Development Types
Residential (Units 86, Acres 1.16), Office (Sq. Ft. 137912, Acres 1.16, Employees 414), Commercial (Sq. Ft. 1574, Acres 1.16, Employees 2)
Local Actions
Site Plan
Project Issues
Aesthetics, Agriculture and Forestry Resources, Air Quality, Biological Resources, Cultural Resources, Cumulative Effects, Drainage/Absorption, Energy, Flood Plain/Flooding, Geology/Soils, Greenhouse Gas Emissions, Growth Inducement, Hazards & Hazardous Materials, Hydrology/Water Quality, Land Use/Planning, Mineral Resources, Noise, Population/Housing, Public Services, Recreation, Schools/Universities, Sewer Capacity, Solid Waste, Transportation, Tribal Cultural Resources, Utilities/Service Systems, Vegetation, Wetland/Riparian, Wildfire
Local Review Period Start
Local Review Period End


Draft Environmental Document [Draft IS, NOI_NOA_Public notices, OPR Summary Form, Appx,]
Notice of Completion [NOC] Transmittal form
State Comment Letters [Comments from state reviewing agencies]

Disclaimer: The Governor’s Office of Planning and Research (OPR) accepts no responsibility for the content or accessibility of these documents. To obtain an attachment in a different format, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at or via phone at (916) 445-0613. For more information, please visit OPR’s Accessibility Site.

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