Beside this: what type of house do you have in mind? The HDB next to Great World City seems to be ready for "upgrading", but still not blocked to public.
On the other hand, across the causeway chances are better to find abandoned houses, some are even newly built and already abandoned ..
this question has been ask many times.... and the answer will be always the same
there is no abandon buildings in SG, is either State Property or Private Property, most of them are closely monitor by security agencies, once anybody enter the premises without permission is consider trespassing, is breaking the law.
So the most useful answer here is DON'T DO IT. just follow the law.
FYI, it is ok to put your site link in your post if your site is showcasing your photography work, but not other commercial site.
the site link in your post all removed.