Section 28-212.4. Service of notice of hearing

Service may be made on the
  owner by delivering such notice to the owner or to an agent of the owner
  or to a person of suitable age and discretion at the residence or  place
  of  business  of  the  owner  or,  if  upon  reasonable application such
  delivery cannot be completed, by affixing such notice in  a  conspicuous
  place  at  the  owner's  place of business or residence or by placing it
  under the entrance door at either of such  locations  or  by  delivering
  such notice to a person employed by the owner to work at or to manage or
  maintain  the  premises  at  which  the  nuisance is located and, in all
  instances except personal delivery upon such owner by mailing the notice
  of hearing as follows: