The Building Inspector or Code Enforcement Officer shall cause
the notice of condemnation, or a copy thereof, to be served on the
owner of the affected property personally or by first-class mail.
The Building Inspector or Code Enforcement Officer shall be permitted,
but not required, to cause the notice of condemnation, or a copy thereof,
to be served on any builder, architect, tenant, contractor, subcontractor,
construction superintendent, or their agents, or any other person
taking part or assisting in work being performed at the affected property
personally or by first-class mail; provided, however, that failure
to serve any person mentioned in this sentence shall not affect the
efficacy of the notice of condemnation.