Commercial Property Rent

There will be a problem with income tax and GST compliance. Since you are collecting GST from one company your Turnover as per GST returns and Income Tax return where you disclose income from all the three will vary. And it's mandatory to disclose GST number if you are filling anything other than ITR 1 & 2, so high chances that you will be served with a notice.

Assessee is showing under ITR-2 for all the Assessment Years until now.
Any issue further

Not really a issue, if you are okay with evading taxes.

if your gross rent collection exceeds 20 lakh then you required to pay GST, as you are already registered under GST you are required to paid gst under inclusive method.

 

Yes agree with above comment