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HPC approves window replacement, ADU and siding recommendations for several properties

Princeton Historic Preservation Commission · April 29, 2026

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Summary

At its April 28 meeting the commission approved a preservation-plan resolution for 144 Mercer Street, approved replacement windows at 9 Mercer Street, and recommended approval to the zoning board for 22 Green Street conditional on use of specified trim material.

The Princeton Historic Preservation Commission approved several routine and revised preservation-plan applications on April 28.

The commission approved a resolution finalizing changes for the trustees of Princeton University at 144 Mercer Street (language corrections to the previously circulated resolution were adopted). The commission then approved a preservation-plan application for 9 Mercer Street: owner Beth Young said the third-floor windows are not original and the replacement Marvin Elevate fiberglass-clad windows will match existing size, configuration and finish while using a different sash material. Staff stated the property is a contributing resource but recommended the commission weigh Secretary of the Interior standards; the commission voted to approve the application as submitted.

Architect-owner Kirsten Thoth presented a revised plan for 22 Green Street that reduces the previously proposed roof impact, adds a small (about 251-square-foot) accessory dwelling unit (ADU) at the rear, and proposes new siding on secondary elevations using a composite product with a wood profile. Commissioners debated substitute siding materials and window/trim choices, and the applicant agreed to use Boral trim/window surrounds (or the product shown in the submission) rather than a newly introduced fiberglass trim. The commission approved a recommendation to the Zoning Board of Adjustment to permit the work and ADU under applicable zoning relief.

All approvals were recorded on roll call. Commissioners emphasized that materials and shop drawings for nonstandard substitutes should be submitted to staff for review before final permits are issued.