4.1  The Contractor shall:

(a)  on or before the date of this Agreement enter into the Building Contract with the Building Contractor;

(b)  deliver the Collateral Warranties from the Building Contractor, the Principal Building Sub-Contractor, each member of the Professional Team [the Independent Certifier] and the FM Contractor(s) to the Authority within [ten/twenty (10/20)] Business Days of the date of this Agreement71;

(c)  not engage any new Building Contractor, or any new FM Contractor(s) (and shall procure that the Building Contractor shall not engage any Principal Building Sub-Contractor, any new member of the Professional Team in connection with the Project unless such person has delivered to the Authority a duly executed agreement substantially in the Agreed Form of the relevant Collateral Warranty duly executed as a deed and in each case such Collateral Warranty must be delivered to the Authority before such entity enters onto any Site.

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71 This time period has been included in the event that there are consultants providing warranties whose appointments have not been finalised at the date of close.  In all other circumstances the warranties should be required to be in place as at the date of close and should be a condition precedent to close.