Proposed Residential Development & Debris Basin at 347 Highland Place

The 347 Highland Place Residential Subdivision and New Debris Basin Project is a proposed development located on the west side of Highland Place, between West Hillcrest Boulevard and Scenic Drive. The project will involve dividing a 7.8-acre hillside property into four separate lots to accommodate: Three new single-family homes, each with an attached garage, plus a new flood control basin (Highland Desilting Basin) to help manage storm water runoff.

To make way for this development, the existing house, outbuildings, and an old dam with a retention basin will be removed. Access to the new homes will be provided by extending the existing private road that currently serves nearby properties at 343, 347, and 349 Highland Place.

Lot Breakdown:

• Lot 1 (West Side, 4.35 Acres): Will contain the new ±52,466-square-foot debris basin and an access road.

• Lot 2 (1 Acre): Will have a 4,039-square-foot single-family home.

• Lot 3 (1 Acre): Will have a 4,493-square-foot single-family home.

• Lot 4 (1 Acre): Will have a 4,544-square-foot single-family home.

The site plan and architectural elevations below show how the homes and debris basin will be arranged on the property.

The City of Monrovia has reviewed the proposed project and determined that an Initial Study/Mitigated Negative Declaration (IS/MND) is required.

An IS/MND is an environmental study that evaluates whether a proposed project will have significant impacts on the surrounding area. The study looks at factors such as traffic, noise, air quality, wildlife, water use, and more. In this case, the findings show that all potential environmental concerns can be addressed by following specific mitigation measures—steps that will reduce or eliminate possible impacts.

The full environmental study, project details, and related documents are available for public review in the following locations:

📍 Online: Scroll to the bottom of this page for links to view the full study.

📍 Monrovia City Hall – Community Development Department (Planning Division)

                Address:  415 South Ivy Avenue, Monrovia, CA 91016
           🕒 Hours:  Monday – Thursday, 7:00 AM – 6:00 PM (Closed on Fridays)

📍 Monrovia Public Library – Reference Room

                Address:  321 South Myrtle Avenue, Monrovia, CA 91016
           🕒 Hours:

• Monday – Wednesday: 10:00 AM – 8:00 PM
• Thursday – Saturday: 10:00 AM – 6:00 PM
• Sunday: Closed

 We encourage the public to review the documents and provide feedback during the comment period.

Public Input on Environmental Concerns:  The City welcomes your input!  You are invited to submit written comments about any environmental concerns related to the project.

• Starts: Monday, March 31, 2025
• Ends: Wednesday, April 30, 2025, at 5:00 PM

How to Submit Comments:  Your input is valuable in this process, and we encourage you to review the documents and share your feedback.  Please include your name, address, and contact information in your submission. Comments and questions can be submitted in the following ways:

Environmental Review Documents for 347 Highland Place

• Draft IS/MND 347 Highland Place Residential Subdivision and New Debris Basin Project
  • Appendix A - CalEEMod Output Files (October 2024) Detailed Report
  • Appendix B - Biological Resources Assessment, Botanical and Tree Survey, California Gnatcatcher Survey (May 2024, updated October 2024)
  • Appendix C - Jurisdictional Delineation (May 2024)
  • Appendix D - Phase I Cultural Resources Assessment (April 2024)
  • Appendix E - Geotechnical Engineering Report (November 2021)
  • Appendix F - Hydrology Report (March 2023)

  
  

• 347 Highland Place Notice of Intent (NOI) - Re-circulation
• 347 Highland Place Notice of Intent (NOI)