D.C. Mun. Regs. tit. 10, r. 10-C212
For a proposed designation of a historic district where there are 50 or fewer property owners, the Board shall provide the same notice as for a historic landmark designation hearing. The Board shall obtain the list of owners from current District of Columbia land records or tax records.
For a proposed designation of a historic district where there are more than 50 property owners, the Board shall provide the same notice as for a historic landmark designation hearing, except that instead of notice to each property owner, the Board may require the applicant to publish notice in a local newspaper of general circulation in the area of the proposed designation. The applicant shall publish this notice at least thirty (30) but not more than seventy-five (75) days before the designation hearing.
If the Board has required the applicant to publish newspaper notice of a proposed historic district designation hearing, the applicant shall also post notice in the proposed historic district at least fifteen (15) days in advance of the hearing, as follows:
Not less than five (5) days before the public hearing, the applicant shall file with the Board a sworn affidavit demonstrating compliance with this posting requirement. A form of affidavit supplied by the Board may be used but is not required.
The applicant shall attach to the affidavit a photograph of each sign after posting and as viewed by the public, identifying the location of each sign and the date of each photograph.
The applicant shall make a reasonable effort to maintain the posted notice by checking the signs periodically, and by posting new notices as necessary.
D.C. Mun. Regs. tit. 10, r. 10-C212