caused, directly or indirectly, except that arising from the Willful act or negligence of the City, its servants, agents and contractors (other than the Developer, its servants, agents and contractors) ; Maintenance from completion, other than standard maintenance, and all expenses and costs relating to the Works incurred by reason of liens for NON=payment of ' labour or material, workers! compensation assessments, unemployment insurance, federal or Provincial tax or by reason of encroachments. Construction of the Works shall be performed by One or more contractors (collectively, the "Contractor") Chosen after a call for tenders made by the Developer; are be made by