District of Columbia Code Division VII. Property. § 42-3131.05a. Notice by mail.

(a) Notice shall be deemed to be served properly on the date when mailed by first class mail to the owner of record of the vacant building at the owner's mailing address as updated in the real property tax records of the Office of Tax and Revenue.

(b) The Mayor shall cause notice also to be posted on the vacant building; provided, that the official notice for legal purposes shall be the notice mailed pursuant to subsection (a) of this section. Unless the Mayor knows with certainty that the vacant building is not eligible for exemption pursuant to § 42-3131.06, the notice shall not be posted by difficult-to-remove adhesive.

(c) A courtesy copy of a notice provided pursuant to subsection (a) of this section shall be mailed or electronically mailed to the Advisory Neighborhood Commission in which the vacant building is located and the status of the building's designation shall be posted on an internet website maintained by the Department of Buildings that is accessible to the public. The courtesy copy required by this subsection shall not be construed to satisfy, nor be construed as necessary to satisfy, the requirements of subsection (a) of this section that notice be properly served by mail.