What are the HARB A and B Zones?

The National Register Historic Districts have each been divided into A and B Zones (HARB District Map (PDF)). The A Zone is more important visually and historically, consisting of major or “gateway” streets, or streets with stretches of grand mansions, or exceptionally well preserved or historic streetscapes. The A zone is subject to stricter regulations than the B zone.

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1. What is the HARB?
2. How do I know if I have to submit an application to the HARB?
3. What is not covered by the HARB?
4. What are the HARB A and B Zones?
5. Is there a fee for appearing before the HARB?
6. Must I appear before the HARB?
7. When does the HARB meet?