1.The non availability of OC or CC is hindrance to give the proeprty on lease.
2. The OC or CC regulatory compliance of the local authority which does not make the building otherwise unlawful or having illegal constructions unless the local authority has declared it so specifically.
3.i am not sure why the proeprty in this case could not be given on lease due to non availability fo OC/CC.
4.For delay in handing over possession compensation can be surely be claimed from the builder by the owners through consumer forum.