In SG tearing down to rebuild is popularly known as en-blocking (or 'enbloc'). As in the required majority of owners have agreed to sell to a developer, all at one time.
It would be interesting to know if it still in hands of the various owners, who are still negotiating the enbloc terms. Or is the building now in the hands of the developer who is still planning his project.
If the former you might have an individual landlord trying to squeeze a last year out of his unit, when he knows that it is unlikely to last that long. If you're dealing with the new developer I'd say it is a much safer bet
I'd do some serious googling on it (including Google/News), and maybe go and speak to the
condo management office.
p.s. They enbloc old
condos to extract max value from the land. But incredibly enough El Centro was only built in 2004!