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New Guidance on Historically-Finished Secondary Spaces and Avoiding Problematic Treatments at Project Completion

Contributed by: Technical Preservation Services, National Park Service
Organization: Technical Preservation Services, National Park Service
Dated Posted: April 21, 2026
Website: Visit External Site

The NPS has also revised its guidance on the treatment of historically-finished secondary spaces that have been previously modified and lack distinctive features or finishes but remain in a finished condition at the start of the project. These spaces must generally be returned to a finished condition at project completion. The guidance addresses three examples — removed plaster and other finishes, exposed mechanical, electrical, and plumbing (MEP) systems, and unfinished commercial tenant spaces — that can sometimes be problematic for the purposes of NPS final certification (Part 3).

In particular, the guidance ("Example 3" in the new guidance) on “white-box” condition of historically-finished secondary interior spaces and ground-floor commercial spaces for which a tenant has yet to be identified has been revised to provide greater flexibility and options to meet program requirements, particularly for larger projects. (A "white-box" treatment in construction refers to a partially finished commercial space with basic finishing, ready for tenants to customize and build out the space to meet their needs.)

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