The local guidelines (based of the guidelines from the Secretary of the Interior) can be found here:

Both the federal and local standards and guidelines are available inspection at the Planning Department at 1120 Monroe NW. In interpreting these standards and guidelines, previous decisions the Commission may be influential But changes which you may see in the neighborhood may have been made before the district was designated; may have been made illegally; or may have been based on special considerations which do not apply to your property. The local guidelines are generally better indicators of Commission action than previous decisions – particularly if those decisions were made prior to the adoption of the relevant guidelines.

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