The way I understand it is that private condo can 'try' to extend the lease (I guess that is the developer) while the HDB would have to probably have to deal with an entire estate and I don't know of any that have ever been extended to be honest.
SOME PEOPLE TRY TO TURN BACK THEIR ODOMETERS. NOT ME. I WANT PEOPLE TO KNOW WHY I LOOK THIS WAY. I'VE TRAVELED A LONG WAY, AND SOME OF THE ROADS WEREN'T PAVED. ~ Will Rogers