Complaints or orders issued by the Inspector shall be served upon persons either personally or by registered or certified mail, but if the whereabouts of such persons are unknown and the same cannot be ascertained by the Inspector in the exercise of reasonable diligence, the Inspector shall make an affidavit to that effect, and the serving of such complaint or order upon such person may be made by publication in a newspaper having general circulation in the city at least once each week for two successive weeks, the last publication being no later than the time at which personal service is required under § 150.089. Where service is made by publication, a notice of the pending proceedings shall be posted in a conspicuous place on the premises affected by the complaint or order.
(1995 Code, § 9-84)