The possibility of losing the roof over their head never crossed the minds of the residents at the upmarket Campa Cola Compound in Mumbai’s Worli area.

But acting on Supreme Court’s order, the Brihanmumbai Municipal Corporation hasserved demolition on seven buildings in the compound, and asked its residents to vacate their flats within 48 hours.

Around 140 families, who have been living there for more than 25 years, have filed a review petition in the apex court alleging that a nexus between the civic body and builders was behind their ordeal.

In 1955, BMC leased the land to Pure Drinks Ltd. for establishing a factory. In 1980, it sought permission from the civic body to develop a large portion of the land for residential purposes, and signed an agreement with three builders to construct the seven buildings. Out of the seven, two are towers with 17 and 20 floors respectively, while three buildings have six floors each and two have seven floors.

According to BMC, the builders were permitted to construct only five floors and all the floors above that are illegal. The apex court, in its order on February 2013, permitted the BMC to demolish the unauthorised floors.

The decision could turn out to be a landmark one for a city battling unauthorised structures.