Bids for the reconstruction of Wendell Cross Elementary School have come in millions of dollars cheaper than city officials predicted. The architect and project manager estimated a $50.6 million cost in October. But on Monday, the Board of Aldermen will be asked to sign off on contract amendments that set the cost at $46.2 million. Wendell Cross had been a 41,098-square-foot building serving 350 children in prekindergarten through fifth grade. The aldermen are being asked to sign off on an amendment to its contract with Newfield Construction setting a guaranteed maximum construction cost of $40.6 million, and a completion date of July 31, 2021.