An Ordinance providing for the laying off, extending and establishing of Duwamish Street, in the City of Georgetown, over and across Block 7 of King County Addition to the City of Seattle, and providing for the taking and damaging of land and other property necessary therefor and for the ascertainment and payment of the just compensation to be made for the private property to be taken or damaged for said purpose, and for an assessment upon the property benefited and for the purpose of making such compensation.