Hi All, had a similar situation, a commercial development within a mixed development SP extending on a small parcel of heritage listed property attached to cp strata council approved 
. Council did not inform the residents, sm nor the heritage council, only the then surrounding commercial properties. Did also not ask for the strata seal. So basically the OC were not aware to respond, one very active resident in our building found council notices for proof of who was notified, OR NOT IN THIS CASE, contacted heritage council and then after some cttt attendance and to cut a long story short, council declared an error and approval was retracted.
Cheers CBF