Bids may be taken for each building. (individual contracts) plus a bid for all buildings (an aggregate contract).The Contractor shall take out and maintain throughout the construction period insurance in the following minimum requirements: a. Proposals MUST be submitted electronically through the Vendor Bids portal save the document, prior to submitting electronically. Issue Bidding Documents to bidders and conduct pre-bid conference with prospective bidders. University of Illinois at UrbanaChampaign.