Retail space occupancy permit issue

Hi experts,

Following is the situation with family member who bought a retail space a little over a year
ago as part of a mixed use new development where commercial retail space are on ground floor
and resi apartments upstairs.

Due to recent owner corporate’s change, the new incoming OC conducted new around of
essential service compliance check and have uncovered the subject retail space fire compliance
requirements are non complying and basically rendered the occupancy permit (OP) invalid!!!
It leaves a very big question mark on why this wasn’t picked up by the previous OC.

Questions:
1. As OP was obtained by tenant who paid for the initial fit-outs, is there legal recourse to
go back to it to demand that it remedies the non-compliance situation on the basis that invalid
OP will have made the tenant in breach of the lease, which I assume may be the case.

2. If answer is no to 1, is there re-course to go back to the original RBS who signed off and
issued the OP which fails to mention or include anything relating to fire compliance.

Anyone else has similar experience with essential service situation like above, not just fire
compliance?

Any suggestion, advice and/or recommendation is welcomed.

Thanks,
FXD