Noida Authority on Tuesday sealed realty firm Supertech's two 40-storey towers with more than 800 flats following the Allahabad High Court's order to demolish the buildings.The towers -Apex and Ceyane — have a combined 857 apartments, of which 600 were sold, and are a part of Supertech's Emerald Court project.On April 11, the court ordered the demolition of the two buildings in Noida and the refund of money to apartment buyers in response to a petition that alleged their construction had violated the law.