MUMBAI, April 24 -- The BMC has conveyed its concerns about the state government's plan to change the definition of high rises from 120 to 180 metres to the deputy director of town planning. Changing the definition will mean that builders will not have to seek permission from the civic body's high rise committee to build structures of up to 180 metres, which is the rule now. It also means that the technical measures that require to be followed in constructing these high rises will no longer be vetted by the committee....