Dear Sir,
Firstly, I am assuming you have taken the capital gain exception in the year 2014. If not, please let us know.
The implications are as under:
1. If you want to assign the constructed property to some other person , the sale if this property will attract short term capital gain.
2. Further,you have to buy the new flat in Chennai before May 2016. Otherwise, you amount exmpetion taken in 2014 will become taxable.
Please let me know if you have further questions.
Thanks and Regards,
CA Abhishek Dugar