When a project involves a historic property, the documentation requirements shift dramatically. You can't just draw what you want and let the contractor build it. Every detail, every material choice, every new addition gets measured against a specific set of federal standards that have been shaping preservation practice since 1992.

The Secretary of the Interior's Standards for the Treatment of Historic Properties provide four distinct treatment approaches: preservation, rehabilitation, restoration, and reconstruction. For the PDD exam, rehabilitation gets the most attention because it's the most commonly used treatment and the only one that permits new additions and alterations for a continuing or changed use.

Beyond the treatment standards themselves, the regulatory setting includes Section 106 review (where federal agencies consult with the State Historic Preservation Officer before approving projects), federal rehabilitation tax credits governed by 36 CFR Part 67, and the International Existing Building Code's Chapter 12 provisions for historic buildings. As an architect documenting a project on a historic property, you need to know how these regulatory layers interact, what triggers each one, and how your construction documents must reflect compliance.

This topic matters on the ARE because NCARB expects you to apply specialty regulations to project documentation, and historic preservation requirements are among the most prescriptive and consequential of those regulations.