No civil action shall be maintained against the City on its employees,
contractors or agents, for damage to property or injury to persons
or death sustained in consequence of any street, highway, bridge,
culvert, sidewalk or crosswalk, or any part or portion thereof, including
any encumbrance thereon or attached thereto, being out of repair,
unsafe, dangerous, obstructed, depressed or raised unless written
notice of the defective, unsafe, dangerous, obstructed, depressed
or raised condition was actually given to the Business Administrator
or any person, entity, department or agent authorized by the Mayor
to receive such notice which notice shall have been given not less
than 30 days prior to the injury complained of.