D.C. Code § 16-1333: Notice of sale of excess property.

When excess real property is to be sold pursuant to section 16-1332 , notice of not less than twenty days before the sale shall be published in a daily newspaper published in the District of Columbia, and notice shall be sent before the sale, by registered mail or by certified mail, to the last-known address of the persons listed on the records of the assessor of the District as the owners of the property abutting on the property to be sold.